Researcher Profile - MORIMOTO Masakazu

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MORIMOTO Masakazu

*Items subject to periodic update by Rikkyo University (The rest are reprinted from information registered on researchmap.)

Affiliation*

College of Science Department of Chemistry
Graduate School of Science Doctoral Program in Chemistry
Graduate School of Science Master's Program in Chemistry

Title*

Professor

Degree

Bachelor of Engineering （ Kyushu University ） / Doctor of Engineering （ Kyushu University ） / Master of Engineering （ Kyushu University ）

Contact information

Homepage

https://www2.rikkyo.ac.jp/web/m-morimoto/

Research Theme*

有機光化学。光の照射により異性化反応を起こして色を変化させるフォトクロミック分子などの光応答分子に関する研究を行っている。光応答分子およびその集積体を合成し、それらの構造や光応答挙動を観測・解析することにより、光機能の発現のための物質設計の指針を確立するとともに、新しい光応答分子デバイスを創出することをめざしている。

Research Interests

Organic photochemistry

Campus Career*

4 2017 - Present

College of Science Department of Chemistry Professor
4 2017 - Present

Graduate School of Science Master's Program in Chemistry Professor
4 2017 - Present

Graduate School of Science Doctoral Program in Chemistry Professor
4 2010 - 3 2017

College of Science Department of Chemistry Associate Professor
4 2010 - 3 2017

Graduate School of Science Master's Program in Chemistry Associate Professor
4 2010 - 3 2017

Graduate School of Science Doctoral Program in Chemistry Associate Professor
4 2007 - 3 2010

College of Science Department of Chemistry Assistant Professor

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External Link

Research Areas

Nanotechnology/Materials / Functional solid state chemistry / Organic photochemistry
Nanotechnology/Materials / Structural organic chemistry and physical organic chemistry

Research History

4 2017 - Present

RIKKYO UNIVERSITY College of Science Department of Chemistry Professor

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4 2017 - Present

RIKKYO UNIVERSITY Graduate School of Science Field of Study: Chemistry Professor

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4 2017 - Present

RIKKYO UNIVERSITY Graduate School of Science Field of Study: Chemistry Professor

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4 2010 - 3 2017

RIKKYO UNIVERSITY College of Science Department of Chemistry Associate Professor

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10 2007 - 3 2011

PRESTO, Japan Science and Technology Agency

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4 2007 - 3 2010

RIKKYO UNIVERSITY College of Science Department of Chemistry Assistant Professor

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9 2006 - 3 2007

Tohoku University Graduate School of Science

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4 2006 - 8 2006

Tohoku University Graduate School of Science

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4 2004 - 3 2006

Japan Society for the Promotion of Science Special researcher of the Japan Society for the Promotion of Science

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Education

4 2003 - 3 2006

Kyushu University Department of Chemistry and Biochemistry

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Country： Japan

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4 2001 - 3 2003

Kyushu University Department of Chemistry and Biochemistry

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Country： Japan

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4 1997 - 3 2001

Kyushu University Faculty of Engineering Department of Materials Science and Engineering

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Country： Japan

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Awards

9 2017

The Japanese Photochemistry Association The Japanese Photochemistry Association Award for Young Scientist 2017 Development of novel photofunctional molecular crystals based on crystal-engineering strategy

Masakazu Morimoto

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Award type：Award from Japanese society, conference, symposium, etc. Country：Japan

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Papers

A Visible‐Light‐Responsive Fluorescent Diarylethene Having a Betaine Structure Peer-reviewed

Ryo Nishimura, Naoki Kaisho, Masakazu Morimoto

Chemistry – A European Journal 11 9 2024

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

As a new molecular scaffold of photoswitchable fluorophore, we developed a photochromic diarylethene containing a betaine structure based on pyridinium N‐enolate. A facile reaction of a pyridyl‐substituted dithienylperfluorocyclopentene derivative with octafluorocyclopentene constructed the betaine structure. The introduction of the betaine moiety provided the diarylethene molecule with bathochromically shifted optical absorption and fluorescing ability, thus enabling the molecule to function as a visible‐light‐sensitive turn‐off mode photoswitchable fluorophore. The molecule in the open‐ring form emitted bright blueish green fluorescence. Upon irradiation with 405 nm light, the molecule underwent cyclization isomerization to form the closed‐ring isomer and the fluorescence intensity significantly decreased. The turn‐off mode fluorescence photoswitching was observed not only in solution but also in polymer films.

DOI： 10.1002/chem.202403076

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Molecular Design of Pyrene and Its Derivatives to Make Microcrystalline Films with Silver Luster Effect Using Drop-Casting Method Peer-reviewed

Tatsuya Maeda, Yuma Nakagawa, Ryo Nishimura, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Crystal Growth & Design24 ( 11 ) 4563 - 4571 22 5 2024

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/acs.cgd.4c00218

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Near-infrared two-photon absorption and excited state dynamics of a fluorescent diarylethene derivative Peer-reviewed

Hikaru Sotome, Tatsuhiro Nagasaka, Tatsuki Konishi, Kenji Kamada, Masakazu Morimoto, Masahiro Irie, Hiroshi Miyasaka

Photochemical & Photobiological Sciences23 ( 6 ) 1041 - 1050 7 5 2024

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

Near-infrared two-photon absorption and excited state dynamics of a fluorescent diarylethene (fDAE) derivative were investigated by time-resolved absorption and fluorescence spectroscopies. Prescreening with quantum chemical calculation predicted that a derivative with methylthienyl groups (mt-fDAE) in the closed-ring isomer has a two-photon absorption cross-section larger than 1000 GM, which was experimentally verified by Z-scan measurements and excitation power dependence in transient absorption. Comparison of transient absorption spectra under one-photon and simultaneous two-photon excitation conditions revealed that the closed-ring isomer of mt-fDAE populated into higher excited states deactivates following three pathways on a timescale of ca. 200 fs: (i) the cycloreversion reaction more efficient than that by the one-photon process, (ii) internal conversion into the S1 state, and (iii) relaxation into a lower state (S1’ state) different from the S1 state. Time-resolved fluorescence measurements demonstrated that this S1’ state is relaxed to the S1 state with the large emission probability. These findings obtained in the present work contribute to extension of the ON–OFF switching capability of fDAE to the biological window and application to super-resolution fluorescence imaging in a two-photon manner.

Graphical Abstract

DOI： 10.1007/s43630-024-00573-y

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Other Link： https://link.springer.com/article/10.1007/s43630-024-00573-y/fulltext.html
Mechanically Induced Transient Fluorescence of Photochromic Diarylethene Crystals for Sensing and Security Material Peer-reviewed

Ryo Nishimura, Yuka Kobayashi, Hikaru Sotome, Hiroshi Miyasaka, Masakazu Morimoto

Advanced Optical Materials12 ( 24 ) 30 4 2024

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

Luminescent materials responding to mechanical stimulation can visualize the strain and mechanical damage applied to objects. Mechanofluorochromism is a well‐known phenomenon induced by the mechanical force on fluorescent crystalline materials. However, simple application of the mechanofluorochromism is unsuitable for temporally and spatially detecting stress in detail because the fluorescent state is kept for rather long period. Here, the dynamic stress‐sensing luminescent solid material of a photochromic diarylethene with a fluorescent moiety is reported. Under the stress applied to the crystalline state, this material emitted cyan‐colored transient fluorescence that is rapidly diminished within a few second. This dynamic fluorescence phenomenon is well controlled by the combination of light irradiation and other external stimuli (organic solvent vapor and/or heat). In addition, the luminescence period is regulated by the excitation wavelength and magnitude of applied force. By utilizing these responses, the rewritable dynamic information encryption is successfully demonstrated. This material with transient fluorescence overcomes the persistence of fluorescence color of mechanochromism and present results provide a new principle for multifunctional light‐emitting materials responding to mechanical stimulation.

DOI： 10.1002/adom.202400143

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Straightforward Fabrication of Double Roughness Structures on a Microcrystalline Film of a Diarylethene Derivative Peer-reviewed

Yuki Hashimoto, Amane Hase, Ryotaro Shiromae, Ryo Nishimura, Masakazu Morimoto, Yohei Hattori, Hiroyuki Mayama, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Langmuir40 ( 14 ) 7661 - 7668 27 3 2024

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/acs.langmuir.4c00365

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Self-Assembly of Chiral Diarylethene Microcrystals by the Sublimation Process to Form Foliage Scroll Pattern Peer-reviewed

Ryo Nishimura, Ayako Fujimoto, Takashi Kamitanaka, Haruki Sugiyama, Akiko Sekine, Nobuhiro Yasuda, Yohei Hattori, Masakazu Morimoto, Hiroyuki Mayama, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Crystal Growth & Design24 ( 7 ) 2791 - 2798 14 3 2024

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/acs.cgd.3c01424

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Reversible change of luster color from pale yellow to wine red in microcrystalline film by photochromic diarylethene having a naphthyl group Peer-reviewed

Ryotaro Shiromae, Yuma Nakagawa, Shota Watanabe, Ryo Nishimura, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

CrystEngComm26 ( 36 ) 5090 - 5098 2024

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

Microcrystalline film prepared by photochromic diarylethene having a naphthyl group can reversibly change its luster color from pale yellow to wine red upon irradiation with light of different wavelengths.

DOI： 10.1039/d4ce00717d

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Photoinduced Multistep Bending of 7-Acetoxy-4-methylcoumarin Crystal Peer-reviewed

Misaki Kitagawa, Yuma Nakagawa, Takato Ii, Ryo Nishimura, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Crystal Growth & Design24 ( 3 ) 913 - 922 16 11 2023

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/acs.cgd.3c00738

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A turn-on mode fluorescent diarylethene having an azacrown ether receptor: Metal-ion-gated enhancement of the photoreactivity and fluorescence Peer-reviewed

Shota Takaku, Ryo Nishimura, Masakazu Morimoto

Dyes and Pigments216 111354 8 2023

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.dyepig.2023.111354

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Dual-radical-based molecular anisotropy and synergy effect of semi-conductivity and valence tautomerization in a photoswitchable coordination polymer Peer-reviewed

Jing-Wei Dai, Yu-Qin Li, Zhao-Yang Li, Hai-Tao Zhang, Carmen Herrmann, Shohei Kumagai, Marko Damjanović, Markus Enders, Hiroyuki Nojiri, Masakazu Morimoto, Norihisa Hoshino, Tomoyuki Akutagawa, Masahiro Yamashita

National Science Review10 ( 6 ) nwad047 23 2 2023

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Language：English Publishing type：Research paper (scientific journal) Publisher：Oxford University Press (OUP)

Abstract

Organic radicals are widely used as linkers or ligands to synthesize molecular magnetic materials. However, studies regarding the molecular anisotropies of radical-based magnetic materials and their multifunctionalities are rare. Herein, a photoisomerizable diarylethene ligand was used to form {[CoIII(3,5-DTSQ·–)(3,5-DTCat2–)]2(6F-DAE-py2)}·3CH3CN·H2O (o-1·3CH3CN·H2O, 6F-DAE-py2 = 1,2-bis(2-methyl-5-(4-pyridyl)-3-thienyl)perfluorocyclopentene), a valence-tautomeric (VT) coordination polymer. We directly observed dual radicals for a single crystal using high-field/-frequency (∼13.3 T and ∼360 GHz) electron paramagnetic resonance (EPR) spectroscopy along the c-axis, which was further confirmed by angle-dependent Q-band EPR spectroscopy. Moreover, a conductive anomaly close to the VT transition temperature was observed only when probes were attached at the ab plane of the single crystal, indicative of synergy between valence tautomerism and conductivity. Structural anisotropy studies and density functional theory (DFT) calculations revealed that this synergy is due to electron transfer associated with valence tautomerism. This study presents the first example of dual-radical-based molecular anisotropy and charge-transfer-induced conductive anisotropy in a photoswitchable coordination polymer.

DOI： 10.1093/nsr/nwad047

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Other Link： https://academic.oup.com/nsr/article-pdf/10/6/nwad047/50910384/nwad047.pdf
Efficient Surface Peeling, a Photoinduced Result of Photochromic Diarylethene Crystal by Multistep Light Irradiation Peer-reviewed

Yuma Nakagawa, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Crystal Growth & Design23 ( 3 ) 1581 - 1591 1 2 2023

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/acs.cgd.2c01202

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Diarylethene Isomerization by Using Triplet–Triplet Annihilation Photon Upconversion Peer-reviewed

Wera Larsson, Masakazu Morimoto, Masahiro Irie, Joakim Andréasson, Bo Albinsson

Chemistry – A European Journal29 ( 13 ) e202203651 17 1 2023

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

Green‐to‐blue triplet–triplet annihilation photon upconversion with the well‐studied upconversion pair 9,10‐diphenylanthracene (DPA)/platinum octaethylporphyrin (PtOEP) was used to reversibly drive the photoisomerization of diarylethene (DAE) photoswitches by using visible light. By carefully selecting the kinetic and spectral properties of the molecular system as well as the experimental geometry, a single green light source can be used to selectively trigger both the ring‐opening and the ring‐closing reactions, whilst also inducing fluorescence from the colored closed isomer that can be used as a readout to monitor the isomerization process in situ. The upconversion solution and the DAE solution are kept physically separated, allowing them to be characterized both concomitantly and individually without further separation processes. The ring‐closing reaction using upconverted photons was quantified and compared to the efficiency of direct isomerization with ultraviolet light.

DOI： 10.1002/chem.202203651

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/chem.202203651
Multicolor Photochromism of Two-Component Diarylethene Crystals Containing Oxidized and Unoxidized Benzothiophene Groups Peer-reviewed

Ryo Nishimura, Yurika Nagakawa, Masakazu Morimoto

Crystals12 ( 12 ) 1730 29 11 2022

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

Preparing mixed crystals composed of two or more components is one of the useful approaches to not only modifying the physical properties and chemical reactivity of molecular crystals but also creating their novel functionality. Here we report preparation and photoresponsive properties of two-component mixed crystals containing photochromic bis(benzothienyl)ethene derivatives that show different colors in the closed-ring forms depending on the oxidation state of the benzothiophene groups. The similarity in the molecular structures of the two diarylethenes, which are different from each other only in the oxidation state of the benzothiophene groups, allowed the formation of two-component mixed crystals by recrystallization from mixed solutions containing the two compounds. Irradiating the mixed crystals with light of appropriate wavelengths induced the selective photoisomerizaion of the two diarylethenes, leading to multicolor photochromic performance, such as colorless, orange, yellow, and red. Such molecular crystals with multiresponsive functions can find potential applications in multistate optical recording and multicolor displays. The present results demonstrate that combining differently oxidized diarylethene derivatives is an effective strategy for preparing multicomponent mixed crystals with finely tuned composition and desired photoresponsive properties.

DOI： 10.3390/cryst12121730

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Phototunable golden luster microcrystalline film of photochromic diarylethene Peer-reviewed

Yuma Nakagawa, Ryo Nishimura, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Bulletin of the Chemical Society of Japan95 ( 10 ) 1438 - 1444 23 8 2022

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Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

DOI： 10.1246/bcsj.20220169

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White light emission generated by two stacking patterns of a single organic molecular crystal Peer-reviewed

Yuma Nakagawa, Kuon Kinoshita, Megumi Kasuno, Ryo Nishimura, Masakazu Morimoto, Satoshi Yokojima, Makoto Hatakeyama, Yuki Sakamoto, Shinichiro Nakamura, Kingo Uchida

Materials Advances3 ( 16 ) 6466 - 6473 8 2022

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

In this study, a new type of single-molecule white luminescence is presented. This luminescence is accomplished by dual emission from two different stacking patterns having different overlapping areas in the crystal.

DOI： 10.1039/d2ma00670g

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Turn-on mode fluorescent diarylethene containing neopentyl substituents that undergoes all-visible-light switching Peer-reviewed

Ryo Nishimura, Eri Fujisawa, Ifu Ban, Ryota Iwai, Shoya Takasu, Masakazu Morimoto, Masahiro Irie

Chemical Communications58 ( 30 ) 4715 - 4718 4 2022

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

Introduction of neopentyl substituents at reactive carbons dramatically increases the cycloreversion (switching-off) quantum yield of fluorescent diarylethenes.

DOI： 10.1039/d2cc00554a

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Photoinduced cytotoxicity of photochromic symmetric diarylethene derivatives: the relation of structure and cytotoxicity Peer-reviewed

Yuma Nakagawa, Tatsuya Hishida, Eri Hatano, Kimio Sumaru, Kana Morishita, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Organic & Biomolecular Chemistry20 ( 15 ) 3211 - 3217 4 2022

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

The photoinduced cytotoxicity of twelve diarylethene derivatives having thiazole or pyridine rings in their molecules was evaluated in terms of molecular structure and size.

DOI： 10.1039/d2ob00224h

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Visualization of the microstructure and the position-dependent diffusion coefficient in a blended polymer solid using photo-activation localization microscopy combined with single-molecule tracking based on one-color fluorescence-switching of diarylethene Peer-reviewed

Syoji Ito, Misato Funaoka, Itsuo Hanasaki, Satoshi Takei, Masakazu Morimoto, Masahiro Irie, Hiroshi Miyasaka

Polymer Chemistry13 ( 6 ) 736 - 740 2 2022

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

Using one-color fluorescence-switching of diarylethene derivatives (DAEs), thousands of single-molecule translational trajectories in a blended polymer solid were measured with nanometric accuracy.

DOI： 10.1039/d1py01100f

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Molecular crystalline capsules that release their contents by light Peer-reviewed

Akira Nagai, Ryo Nishimura, Yohei Hattori, Eri Hatano, Ayako Fujimoto, Masakazu Morimoto, Nobuhiro Yasuda, Kenji Kamada, Hikaru Sotome, Hiroshi Miyasaka, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Chemical Science12 ( 34 ) 11585 - 11592 9 2021

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

A novel diarylethene formed “crystalline capsules” containing liquid inclusions, and chemicals trapped in the capsules were released by photoinduced breaking. Operations by multiphoton and linear polarized light were demonstrated.

DOI： 10.1039/d1sc03394h

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Photoinduced topographical surface changes and photoresponse of the crystals of 7-methoxycoumarin Peer-reviewed

Kanae Yano, Ryo Nishimura, Yohei Hattori, Masakazu Morimoto, Haruki Sugiyama, Takashi Kamitanaka, Satoshi Yokojima, Shinichio Nakamura, Kingo Uchida

CrystEngComm23 ( 34 ) 5780 - 5787 9 2021

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

Photoinduced topographical changes, bending, and photosalient effect due to the dimerization reaction were observed on a single crystal of 7-methoxycoumarin, upon deep UV (254 nm) light irradiation.

DOI： 10.1039/d1ce00444a

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Photochemically Switchable Interconnected Microcavities for All‐Organic Optical Logic Gate Peer-reviewed

Hendra, Akihide Takeuchi, Hiroshi Yamagishi, Osamu Oki, Masakazu Morimoto, Masahiro Irie, Yohei Yamamoto

Advanced Functional Materials31 ( 34 ) 2103685 - 2103685 8 2021

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/adfm.202103685

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/adfm.202103685
Fluorescence Switchable Conjugated Polymer Microdisk Arrays by Cosolvent Vapor Annealing Peer-reviewed

Hiroshi Yamagishi, Tokiya Matsui, Yusuke Kitayama, Yusuke Aikyo, Liang Tong, Junpei Kuwabara, Takaki Kanbara, Masakazu Morimoto, Masahiro Irie, Yohei Yamamoto

Polymers13 ( 2 ) 269 - 269 15 1 2021

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Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

Depositing minute light emitters into a regular array is a basic but essential technique in display technology. However, conventional lithographic methodologies involve multistep and energy-consuming processes. Here, we develop a facile method in which organic and polymeric fluorescent dyes spontaneously aggregate to form a patterned microarray. We find that a thin film of fluorescent π-conjugated polymer transforms into micrometer-sized aggregates when exposed to binary organic vapor at ambient temperature. The arrayed microaggregates can be formed over the whole substrate surface when using a quartz substrate that is prepatterned with regular hydrophilic boxes and hydrophobic grids. The resultant microarray is applicable to optical memories and displays when photoswitchable fluorophores are doped into the polymer matrix.

DOI： 10.3390/polym13020269

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Stepwise Assembly of Ultrathin Poly(vinyl alcohol) Films on Photoresponsive Diarylethene Crystals Peer-reviewed

Hiroka Chiba, Masakazu Morimoto, Masahiro Irie

Chemistry Letters50 ( 1 ) 84 - 86 5 1 2021

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Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

DOI： 10.1246/cl.200693

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Photoinduced swing of a diarylethene thin broad sword shaped crystal: a study on the detailed mechanism Peer-reviewed

Ayako Fujimoto, Noriko Fujinaga, Ryo Nishimura, Eri Hatano, Luna Kono, Akira Nagai, Akiko Sekine, Yohei Hattori, Yuko Kojima, Nobuhiro Yasuda, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Ben L. Feringa, Kingo Uchida

Chemical Science11 ( 45 ) 12307 - 12315 12 2020

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

We report a swinging motion of photochromic thin broad sword shaped crystals upon continuous irradiation with UV light.

DOI： 10.1039/d0sc05388k

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A cytosolically localized far-red to near-infrared rhodamine-based fluorescent probe for calcium ions Peer-reviewed

Koji Numasawa, Kenjiro Hanaoka, Takayuki Ikeno, Honami Echizen, Tomoe Ishikawa, Masakazu Morimoto, Toru Komatsu, Tasuku Ueno, Yuji Ikegaya, Tetsuo Nagano, Yasuteru Urano

Analyst145 ( 23 ) 7736 - 7740 12 2020

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

We developed the cytosolically localized far-red to NIR fluorescent probe for Ca2+,<bold>CaSiR-2 AM</bold>, utilizing the rhodamine scaffold.

DOI： 10.1039/d0an01739f

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Cyclization from Higher Excited States of Diarylethenes Having a Substituted Azulene Ring Peer-reviewed

Yohei Hattori, Tatsuya Maejima, Yumi Sawae, Jun‐ichiro Kitai, Masakazu Morimoto, Ryojun Toyoda, Hiroshi Nishihara, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Chemistry – A European Journal26 ( 50 ) 11441 - 11450 4 9 2020

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/chem.202001671

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/chem.202001671
Optical microresonator arrays of fluorescence-switchable diarylethenes with unreplicable spectral fingerprints Peer-reviewed

Daichi Okada, Zhan-Hong Lin, Jer-Shing Huang, Osamu Oki, Masakazu Morimoto, Xuying Liu, Takeo Minari, Satoshi Ishii, Tadaaki Nagao, Masahiro Irie, Yohei Yamamoto

Materials Horizons7 ( 7 ) 1801 - 1808 7 2020

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

Photochromic microresonator arrays with whispering gallery mode fingerprints are successfully prepared, which function as high-security optical authentication microdevices.

DOI： 10.1039/d0mh00566e

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Turn-on mode fluorescent diarylethenes: effect of electron-donating and electron-withdrawing substituents on photoswitching performance Peer-reviewed

Ryota Iwai, Masakazu Morimoto, Masahiro Irie

Photochemical & Photobiological Sciences19 ( 6 ) 783 - 789 6 2020

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

The resistance of turn-on mode fluorescent diarylethenes against photodegradation is remarkably improved by introducing electron-donating substituents.

DOI： 10.1039/d0pp00064g

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Object Transportation System Mimicking the Cilia of Paramecium aurelia Making Use of the Light‐Controllable Crystal Bending Behavior of a Photochromic Diarylethene Peer-reviewed

Ryo Nishimura, Ayako Fujimoto, Nobuhiro Yasuda, Masakazu Morimoto, Tatsuhiro Nagasaka, Hikaru Sotome, Syoji Ito, Hiroshi Miyasaka, Satoshi Yokojima, Shinichiro Nakamura, Ben L. Feringa, Kingo Uchida

Angewandte Chemie International Edition58 ( 38 ) 13308 - 13312 16 9 2019

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/anie.201907574

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/anie.201907574
Thermally reversible photochromism of dipyrrolylethenes Peer-reviewed

Kohei Inaba, Ryota Iwai, Masakazu Morimoto, Masahiro Irie

Photochemical & Photobiological Sciences18 ( 9 ) 2136 - 2141 9 2019

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

A robust dipyrrolylethene derivative which undergoes thermally reversible and fatigue resistant photochromic reactions with appropriate fading rates has been designed and synthesized.

DOI： 10.1039/c8pp00557e

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An all-photonic full color RGB system based on molecular photoswitches Peer-reviewed

Gaowa Naren, Chien-Wei Hsu, Shiming Li, Masakazu Morimoto, Sicheng Tang, Jordi Hernando, Gonzalo Guirado, Masahiro Irie, Françisco M. Raymo, Henrik Sundén, Joakim Andréasson

Nature Communications10 ( 1 ) 3996 9 2019

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1038/s41467-019-11885-4

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Other Link： http://www.nature.com/articles/s41467-019-11885-4
Photosalient Effect of Diarylethene Crystals of Thiazoyl and Thienyl Derivatives Peer-reviewed

Yuma Nakagawa, Masakazu Morimoto, Nobuhiro Yasuda, Kengo Hyodo, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Chemistry – A European Journal25 ( 33 ) 7874 - 7880 12 6 2019

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/chem.201900811

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/chem.201900811
Synthesis, Structures, and Magnetic Properties of Two Coordination Assemblies of Mn(III) Single Molecule Magnets Bridged via Photochromic Diarylethene Ligands Peer-reviewed

Ahmed Fetoh, Goulven Cosquer, Masakazu Morimoto, Masahiro Irie, Ola El-Gammal, Gaber M. Abu El-Reash, Brian K. Breedlove, Masahiro Yamashita

Inorganic Chemistry58 ( 4 ) 2307 - 2314 18 2 2019

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/acs.inorgchem.8b02578

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Molecular photoswitches: fundamentals and applications of diarylethenes

Masahiro Irie, Masakazu Morimoto

Photochemistry47 457 - 497 2019

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Language：English Publishing type：Part of collection (book) Publisher：Royal Society of Chemistry

DOI： 10.1039/9781788016520-00457

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Multiphoton-gated cycloreversion reaction of a fluorescent diarylethene derivative as revealed by transient absorption spectroscopy Peer-reviewed

Tatsuhiro Nagasaka, Tomohiro Kunishi, Hikaru Sotome, Masafumi Koga, Masakazu Morimoto, Masahiro Irie, Hiroshi Miyasaka

Physical Chemistry Chemical Physics20 ( 30 ) 19776 - 19783 8 2018

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

We report that the cycloreversion quantum reaction yield of a fluorescent diarylethene derivative is enhanced by a factor of >1800.

DOI： 10.1039/c8cp01467a

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The photoregulation of a mechanochemical polymer scission Peer-reviewed

Jumpei Kida, Keiichi Imato, Raita Goseki, Daisuke Aoki, Masakazu Morimoto, Hideyuki Otsuka

Nature Communications9 ( 1 ) 3504 8 2018

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1038/s41467-018-05996-7

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Other Link： http://www.nature.com/articles/s41467-018-05996-7
A turn-on mode fluorescent diarylethene: Solvatochromism of fluorescence Peer-reviewed

Masakazu Morimoto, Yuta Takagi, Karina Hioki, Tatsuhiro Nagasaka, Hikaru Sotome, Syoji Ito, Hiroshi Miyasaka, Masahiro Irie

Dyes and Pigments153 144 - 149 6 2018

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

© 2018 Elsevier Ltd Environment-sensitive fluorophores have been used as molecular probes to acquire physical and chemical information in microstructures. Here, we report on solvatochromism of a fluorescent diarylethene, which is switched by photoirradiation. A turn-on mode photoswitchable fluorescent diarylethene derivative, 1,2-bis(2-ethyl-6-(5-methylthiophen-2-yl)-1-benzothiophen-1,1-dioxide-3-yl)perfluorocyclopentene (1a), underwent a cyclization reaction upon irradiation with ultraviolet (UV) light to form fluorescent closed-ring isomer 1b. 1b dramatically changed the fluorescent color in response to solvent polarity, such as green in n-hexane, yellow in tetrachloromethane (CCl4), orange in dichloromethane (CH2Cl2), and red in dimethyl sulfoxide (DMSO), and showed high fluorescence quantum yields of 0.6–0.8 in these solvents. The fluorescent solvatochromism is ascribed to the intramolecular charge-transfer (ICT) character of 1b, which consists of electron-donating thiophene rings at both ends and central electron-accepting benzothiophene 1,1-dioxide groups. The analysis based on the Mataga-Lippert plot revealed that the difference in the dipole moments between the excited and ground states of 1b is as large as 12 D. Such a solvatochromic fluorophore with photoswitching ability can find potential applications in super-resolution fluorescence imaging of microscopic polarity in biological cells and materials.

DOI： 10.1016/j.dyepig.2018.02.016

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Mesoscopic Motion of Optically Trapped Particle Synchronized with Photochromic Reactions of Diarylethene Derivatives Peer-reviewed

Syoji Ito, Morio Mitsuishi, Kenji Setoura, Mamoru Tamura, Takuya Iida, Masakazu Morimoto, Masahiro Irie, Hiroshi Miyasaka

The Journal of Physical Chemistry Letters9 ( 10 ) 2659 - 2664 17 5 2018

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/acs.jpclett.8b00890

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Photoswitchable Turn-on Mode Fluorescent Diarylethenes: Strategies for Controlling the Switching Response Peer-reviewed

Masahiro Irie, Masakazu Morimoto

Bulletin of the Chemical Society of Japan91 ( 2 ) 237 - 250 15 2 2018

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Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

DOI： 10.1246/bcsj.20170365

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Fluorescence Photoswitching of a Diarylethene by Irradiation with Single-Wavelength Visible Light Peer-reviewed

Ryota Kashihara, Masakazu Morimoto, Syoji Ito, Hiroshi Miyasaka, Masahiro Irie

Journal of the American Chemical Society139 ( 46 ) 16498 - 16501 22 11 2017

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/jacs.7b10697

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Thermal decomposition product of 1,2-bis(2-methyl-1-benzofuran-3-yl)perfluorocyclopentene Peer-reviewed

Tadatsugu Yamaguchi, Tsuyoshi Nakagawa, Toru Ozeki, Mitsuhiro Fukuda, Masakazu Morimoto, Shizuka Takami

Tetrahedron Letters58 ( 47 ) 4447 - 4449 11 2017

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.tetlet.2017.10.017

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Photosalient Phenomena that Mimic Impatiens Are Observed in Hollow Crystals of Diarylethene with a Perfluorocyclohexene Ring Peer-reviewed

Eri Hatano, Masakazu Morimoto, Takahito Imai, Kengo Hyodo, Ayako Fujimoto, Ryo Nishimura, Akiko Sekine, Nobuhiro Yasuda, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Angewandte Chemie International Edition56 ( 41 ) 12576 - 12580 2 10 2017

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/anie.201706684

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/anie.201706684
Photoswitchable Fluorescent Diarylethene Derivatives with Thiophene 1,1-Dioxide Groups: Effect of Alkyl Substituents at the Reactive Carbons Peer-reviewed

Masakazu Morimoto, Takaki Sumi, Masahiro Irie

Materials10 ( 9 ) 1021 2 9 2017

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

Photoswitching and fluorescent properties of sulfone derivatives of 1,2-bis(2-alkyl-4-methyl-5-phenyl-3-thienyl)perfluorocyclopentene, 1–5, having methyl, ethyl, n-propyl, i-propyl, and i-butyl substituents at the reactive carbons (2- and 2′-positions) of the thiophene 1,1-dioxide rings were studied. Diarylethenes 1–5 underwent isomerization reactions between open-ring and closed-ring forms upon alternate irradiation with ultraviolet (UV) and visible light and showed fluorescence in the closed-ring forms. The alkyl substitution at the reactive carbons affects the fluorescent property of the closed-ring isomers. The closed-ring isomers 2b–5b with ethyl, n-propyl, i-propyl, and i-butyl substituents show higher fluorescence quantum yields than 1b with methyl substituents. In polar solvents, the fluorescence quantum yield of 1b markedly decreases, while 2b–5b maintain the relatively high fluorescence quantum yields. Although the cycloreversion quantum yields of the derivatives with methyl, ethyl, n-propyl, and i-propyl substituents are quite low and in the order of 10−5, introduction of i-butyl substituents was found to increase the yield up to the order of 10−3. These results indicate that appropriate alkyl substitution at the reactive carbons is indispensable for properly controlling the photoswitching and fluorescent properties of the photoswitchable fluorescent diarylethenes, which are potentially applicable to super-resolution fluorescence microscopies.

DOI： 10.3390/ma10091021

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Turn-on mode fluorescent diarylethenes: Control of the cycloreversion quantum yield Peer-reviewed

Yuta Takagi, Masakazu Morimoto, Ryota Kashihara, Sae Fujinami, Syoji Ito, Hiroshi Miyasaka, Masahiro Irie

Tetrahedron73 ( 33 ) 4918 - 4924 8 2017

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.tet.2017.03.040

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Photoregulation of Retro-Diels–Alder Reaction at the Center of Polymer Chains Peer-reviewed

Jumpei Kida, Keiichi Imato, Raita Goseki, Masakazu Morimoto, Hideyuki Otsuka

Chemistry Letters46 ( 7 ) 992 - 994 5 7 2017

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Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

DOI： 10.1246/cl.170251

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One-colour control of activation, excitation and deactivation of a fluorescent diarylethene derivative in super-resolution microscopy Peer-reviewed

Yuhei Arai, Syoji Ito, Hajime Fujita, Yusuke Yoneda, Takahiro Kaji, Satoshi Takei, Ryota Kashihara, Masakazu Morimoto, Masahiro Irie, Hiroshi Miyasaka

Chemical Communications53 ( 29 ) 4066 - 4069 4 2017

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

We demonstrated one-colour control of activation, excitation and deactivation of a fluorescent diarylethene derivative by using a 532 nm CW laser at a weak output power.

DOI： 10.1039/c6cc10073b

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Diastereoselective photocyclization of a photochromic diarylethene having a benzo[b]phosphole P-oxide group Peer-reviewed

Tomohiro Ichikawa, Masakazu Morimoto, Masahiro Irie

Dyes and Pigments137 214 - 220 2 2017

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.dyepig.2016.10.010

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Light-Driven Molecular Crystal Actuators: An Approach to Molecular Machinery Invited Peer-reviewed

Masakazu Morimoto, Masahiro Irie

Journal of Synthetic Organic Chemistry, Japan74 ( 12 ) 1217 - 1224 12 2016

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Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Synthetic Organic Chemistry, Japan

DOI： 10.5059/yukigoseikyokaishi.74.1217

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Turn-on mode fluorescence photoswitching of diarylethene single crystals Peer-reviewed

Masakazu Morimoto, Ryota Kashihara, Katsuya Mutoh, Yoichi Kobayashi, Jiro Abe, Hikaru Sotome, Syoji Ito, Hiroshi Miyasaka, Masahiro Irie

CrystEngComm18 ( 38 ) 7241 - 7248 10 2016

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

DOI： 10.1039/c6ce00725b

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Photoinduced topographical changes on microcrystalline surfaces of diarylethenes Peer-reviewed

Noriko Fujinaga, Naoki Nishikawa, Ryo Nishimura, Kengo Hyodo, Seiji Yamazoe, Yuko Kojima, Kazuki Yamamoto, Tsuyoshi Tsujioka, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

CrystEngComm18 ( 38 ) 7229 - 7235 10 2016

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

DOI： 10.1039/c6ce00718j

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Emission color tuning and white-light generation based on photochromic control of energy transfer reactions in polymer micelles Peer-reviewed

Magnus Bälter, Shiming Li, Masakazu Morimoto, Sicheng Tang, Jordi Hernando, Gonzalo Guirado, Masahiro Irie, Françisco M. Raymo, Joakim Andréasson

Chemical Science7 ( 9 ) 5867 - 5871 9 2016

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

An all-photonic FRET-based system with emission color reversibly changed from blue,<italic>via</italic>white, to yellow is devised.

DOI： 10.1039/c6sc01623e

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Photosalient Effect of a Diarylethene with a Perfluorocyclohexene Ring Peer-reviewed

Eri Hatano, Masakazu Morimoto, Kengo Hyodo, Nobuhiro Yasuda, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Chemistry - A European Journal22 ( 36 ) 12680 - 12683 26 8 2016

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/chem.201603020

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Photoinduced reversible formation of a superhydrophilic surface by crystal growth of diarylethene Peer-reviewed

Kazuki Takase, Kengo Hyodo, Masakazu Morimoto, Yuko Kojima, Hiroyuki Mayama, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Chemical Communications52 ( 42 ) 6885 - 6887 5 2016

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

The surface covered with lumpy crystals shows superhydrophilicity that can be reversibly controlled by alternating irradiation with UV and visible light.

DOI： 10.1039/c6cc01638c

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1D Chains of Lanthanoid Ions and a Dithienylethene Ligand Showing Slow Relaxation of the Magnetization Peer-reviewed

Mudasir Yatoo, Goulven Cosquer, Masakazu Morimoto, Masahiro Irie, Brian Breedlove, Masahiro Yamashita

Magnetochemistry2 ( 2 ) 21 31 3 2016

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Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

DOI： 10.3390/magnetochemistry2020021

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Photochromism of diarylethene derivatives having benzophosphole and benzothiophene groups Peer-reviewed

Tomohiro Ichikawa, Masakazu Morimoto, Hikaru Sotome, Syoji Ito, Hiroshi Miyasaka, Masahiro Irie

Dyes and Pigments126 186 - 193 3 2016

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.dyepig.2015.11.023

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Photo-activation of Single Molecule Magnet Behavior in a Manganese-based Complex Peer-reviewed

Ahmed Fetoh, Goulven Cosquer, Masakazu Morimoto, Masahiro Irie, Ola El-Gammal, Gaber Abu El-Reash, Brian K. Breedlove, Masahiro Yamashita

Scientific Reports6 ( 1 ) 23785 3 2016

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1038/srep23785

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Other Link： http://www.nature.com/articles/srep23785.pdf
Fluorescent Photochromic Diarylethene That Turns on with Visible Light Peer-reviewed

Takaki Sumi, Tomohiro Kaburagi, Masakazu Morimoto, Kanako Une, Hikaru Sotome, Syoji Ito, Hiroshi Miyasaka, Masahiro Irie

Organic Letters17 ( 19 ) 4802 - 4805 2 10 2015

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/acs.orglett.5b02361

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Light-driven bending of diarylethene mixed crystals Peer-reviewed

Satoko Ohshima, Masakazu Morimoto, Masahiro Irie

Chemical Science6 ( 10 ) 5746 - 5752 10 2015

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

The bending response of mixed crystals by selective photoisomerization revealed that the local shape change of each molecule is additively linked to the macroscopic deformation of the crystals.

DOI： 10.1039/c5sc01994j

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Two-colour fluorescent imaging in organisms using self-assembled nano-systems of upconverting nanoparticles and molecular switches Peer-reviewed

Tuoqi Wu, Bob Johnsen, Zhaozhao Qin, Masakazu Morimoto, David Baillie, Masahiro Irie, Neil R. Branda

Nanoscale7 ( 26 ) 11263 - 11266 7 2015

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

A reversible and a non reversible emission probes are used to image nano-assemblies in live worms.

DOI： 10.1039/c5nr03058g

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Photo-control of the magnetic properties of Dy(iii) and Ho(iii) homometal coordination polymers bridged by a diarylethene ligand Peer-reviewed

Goulven Cosquer, Masakazu Morimoto, Masahiro Irie, Ahmed Fetoh, Brian K. Breedlove, Masahiro Yamashita

Dalton Transactions44 ( 13 ) 5996 - 6002 4 2015

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

Two-dimensional Dy(<sc>iii</sc>) and Ho(<sc>iii</sc>) homometal coordination polymers containing the DTE ligand were obtained, and the magnetic properties of the open and closed forms were investigated.

DOI： 10.1039/c4dt03093a

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A diarylethene as the SO2 gas generator upon UV irradiation Peer-reviewed

Ryuhei Kodama, Kimio Sumaru, Kana Morishita, Toshiyuki Kanamori, Kengo Hyodo, Takashi Kamitanaka, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

Chemical Communications51 ( 9 ) 1736 - 1738 1 2015

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

A thermally stable closed-ring isomer of a diarylethene having a sulfone group works as the SO2 gas generator upon UV irradiation; photoisomerization followed by generation of SO2 gas to induce cell death.

DOI： 10.1039/c4cc07790c

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A photo- and halochromic multicolor switching system consisting of diarylethene and malachite green moieties Peer-reviewed

Yuto Tatsumi, Noriko Fujinaga, Megumi Kasuno, Masakazu Morimoto, Satoshi Yokojima, Shinichiro Nakamura, Kingo Uchida

New Journal of Chemistry38 ( 12 ) 5706 - 5714 12 2014

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

A diarylethene with a malachite green moiety was synthesized, and it showed multicolor states by photochromic and halochromic reactions.

DOI： 10.1039/c4nj00434e

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Control of the Single-Molecule Magnet Behavior of Lanthanide-Diarylethene Photochromic Assemblies by Irradiation with Light Peer-reviewed

Dawid Pinkowicz, Min Ren, Li-Min Zheng, Saki Sato, Miki Hasegawa, Masakazu Morimoto, Masahiro Irie, Brian K. Breedlove, Goulven Cosquer, Keiichi Katoh, Masahiro Yamashita

Chemistry - A European Journal20 ( 39 ) 12502 - 12513 22 9 2014

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/chem.201402647

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Photochromism and fluorescence properties of 1,2-bis(2-alkyl-1-benzothiophene-3-yl)perhydrocyclopentenes Peer-reviewed

Tadatsugu Yamaguchi, Manabu Hosaka, Keigo Shinohara, Toru Ozeki, Mitsuhiro Fukuda, Shizuka Takami, Yukihide Ishibashi, Tsuyoshi Asahi, Masakazu Morimoto

Journal of Photochemistry and Photobiology A: Chemistry285 44 - 51 7 2014

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.jphotochem.2014.04.007

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Photochromic Reaction of Diarylethenes Having Phenol Moiety as an Aryl Ring Peer-reviewed

Tadatsugu Yamaguchi, Yusuke Kamihashi, Toru Ozeki, Ayaka Uyama, Jun-ichiro Kitai, Megumi Kasuno, Kimio Sumaru, Yoshiro Kimura, Satoshi Yokojima, Shinichiro Nakamura, Masakazu Morimoto, Kingo Uchida

Bulletin of the Chemical Society of Japan87 ( 4 ) 528 - 538 15 4 2014

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Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

DOI： 10.1246/bcsj.20130252

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Photoirradiation wavelength dependence of cycloreversion quantum yields of diarylethenes Peer-reviewed

Takaki Sumi, Yuta Takagi, Akira Yagi, Masakazu Morimoto, Masahiro Irie

Chemical Communications50 ( 30 ) 3928 - 3928 4 2014

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

DOI： 10.1039/c4cc00396a

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Photocontrol Over Self-Assembled Nanostructures of π-π Stacked Dyes Supported by the Parallel Conformer of Diarylethene Peer-reviewed

Shiki Yagai, Kazunori Iwai, Mitsuaki Yamauchi, Takashi Karatsu, Akihide Kitamura, Shinobu Uemura, Masakazu Morimoto, Hao Wang, Frank Würthner

Angewandte Chemie International Edition53 ( 10 ) 2602 - 2606 3 3 2014

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/anie.201310773

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Asymmetric photoreaction of a diarylethene in hydrogen-bonded cocrystals with chiral molecules Peer-reviewed

Tomohiro Ichikawa, Masakazu Morimoto, Masahiro Irie

Photochem. Photobiol. Sci.13 ( 2 ) 199 - 204 2 2014

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1039/c3pp50239b

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Photochromic Diarylethene Derivatives Bearing Hydrophilic Substituents Peer-reviewed

Yuichiro Shoji, Akira Yagi, Masahiro Horiuchi, Masakazu Morimoto, Masahiro Irie

Israel Journal of Chemistry53 ( 5 ) 303 - 311 5 2013

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Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/ijch.201300018

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Photoswitchable fluorescent diarylethene derivatives with short alkyl chain substituents Peer-reviewed

Yuta Takagi, Tomohiro Kunishi, Tetsuro Katayama, Yukihide Ishibashi, Hiroshi Miyasaka, Masakazu Morimoto, Masahiro Irie

Photochemical & Photobiological Sciences11 ( 11 ) 1661 - 1661 10 2012

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1039/c2pp25078k

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Crystal Structures and Dielectric Properties of 2-Imidazoline Derivatives Having Intermolecular Hydrogen-bonded Networks Peer-reviewed

Masakazu Morimoto, Naoya Takashio, Masahiro Irie

Chemistry Letters41 ( 5 ) 525 - 527 5 5 2012

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

DOI： 10.1246/cl.2012.525

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Photoinduced Reversible Heteroepitaxial Microcrystal Growth of a Photochromic Diarylethene on (110) Surface of SrTiO3 Peer-reviewed

Shingo Sakiyama, Seiji Yamazoe, Ayaka Uyama, Masakazu Morimoto, Satoshi Yokojima, Yuko Kojima, Shinichiro Nakamura, Kingo Uchida

Crystal Growth & Design12 ( 3 ) 1464 - 1468 7 3 2012

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/cg201560f

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Photoreversible Supramolecular Polymerisation and Hierarchical Organization of Hydrogen-Bonded Supramolecular Co-polymers Composed of Diarylethenes and Oligothiophenes Peer-reviewed

Shiki Yagai, Keisuke Ohta, Marina Gushiken, Kazunori Iwai, Atsushi Asano, Shu Seki, Yoshihiro Kikkawa, Masakazu Morimoto, Akihide Kitamura, Takashi Karatsu

Chemistry - A European Journal18 ( 8 ) 2244 - 2253 20 2 2012

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/chem.201103465

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Light-Driven Molecular-Crystal Actuators: Rapid and Reversible Bending of Rodlike Mixed Crystals of Diarylethene Derivatives Peer-reviewed

Fumitaka Terao, Masakazu Morimoto, Masahiro Irie

Angewandte Chemie International Edition51 ( 4 ) 901 - 904 23 1 2012

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/anie.201105585

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Photochromism of diarylethene derivatives bearing a benzo[b]silole unit Peer-reviewed

Tadatsugu Yamaguchi, Manabu Hosaka, Toru Ozeki, Masakazu Morimoto, Masahiro Irie

Tetrahedron Letters52 ( 43 ) 5601 - 5604 10 2011

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.tetlet.2011.08.063

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In Situ Preparation of Highly Fluorescent Dyes upon Photoirradiation Peer-reviewed

Kakishi Uno, Hiroyuki Niikura, Masakazu Morimoto, Yukihide Ishibashi, Hiroshi Miyasaka, Masahiro Irie

Journal of the American Chemical Society133 ( 34 ) 13558 - 13564 31 8 2011

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/ja204583e

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Photochemical control of a highly efficient addition reaction between electron-rich alkynes and tetracyanoethylene Peer-reviewed

Masakazu Morimoto, Kimie Murata, Tsuyoshi Michinobu

Chemical Communications47 ( 35 ) 9819 - 9819 8 2011

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Authorship：Lead author,　Corresponding author Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

DOI： 10.1039/c1cc13476k

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Photochromism of 1,2-Bis(5-n-alkyl-2-phenyloxazol-4-yl)perfluorocyclopentene Derivatives in Single-crystalline Phase Peer-reviewed

Tadatsugu Yamaguchi, Wataru Taniguchi, Tomonori Kagawa, Yusuke Kamihashi, Toru Ozeki, Masakazu Morimoto, Masahiro Irie

Chemistry Letters40 ( 6 ) 635 - 637 5 6 2011

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Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

DOI： 10.1246/cl.2011.635

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Reversible Photocontrol of Surface Wettability between Hydrophilic and Superhydrophobic Surfaces on an Asymmetric Diarylethene Solid Surface Peer-reviewed

Ayaka Uyama, Seiji Yamazoe, Satomi Shigematsu, Masakazu Morimoto, Satoshi Yokojima, Hiroyuki Mayama, Yuko Kojima, Shinichiro Nakamura, Kingo Uchida

Langmuir27 ( 10 ) 6395 - 6400 17 5 2011

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/la2006524

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Photochemical control of dielectric properties based on intermolecular proton transfer in a hydrogen-bonded diarylethene crystal Peer-reviewed

Masakazu Morimoto, Masahiro Irie

Chemical Communications47 ( 14 ) 4186 - 4186 4 2011

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

DOI： 10.1039/c0cc05729k

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Copper(ii)-terbium(iii) Single-Molecule Magnets linked by photochromic ligands Peer-reviewed

Takuya Shiga, Hitoshi Miyasaka, Masahiro Yamashita, Masakazu Morimoto, Masahiro Irie

Dalton Transactions40 ( 10 ) 2275 - 2275 3 2011

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Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

DOI： 10.1039/c0dt01119c

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A Diarylethene Cocrystal that Converts Light into Mechanical Work Peer-reviewed

Masakazu Morimoto, Masahiro Irie

Journal of the American Chemical Society132 ( 40 ) 14172 - 14178 13 10 2010

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/ja105356w

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Photochromism of dithienylethene single crystals having anthracene substituents Peer-reviewed

Hiroki Ohara, Masakazu Morimoto, Masahiro Irie

Photochemical & Photobiological Sciences9 ( 8 ) 1079 - 1079 8 2010

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1039/c0pp00083c

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Photoinduced shape changes of diarylethene single crystals: correlation between shape changes and molecular packing Peer-reviewed

Lumi Kuroki, Shizuka Takami, Kenji Yoza, Masakazu Morimoto, Masahiro Irie

Photochemical & Photobiological Sciences9 ( 2 ) 221 - 221 2 2010

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1039/b9pp00093c

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Photochromic diarylethene molecules and crystals Peer-reviewed

Masahiro Irie, Masakazu Morimoto

Pure and Applied Chemistry81 ( 9 ) 1655 - 1665 10 8 2009

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Language：English Publishing type：Research paper (scientific journal) Publisher：Walter de Gruyter GmbH

Some of the diarylethene derivatives were found to undergo photoisomerization reactions between two isomers even in the single-crystalline phase. The two isomers have different electronic as well as geometrical structures. The electronic structure change induces the reversible color change of the crystal. Single crystals composed of three different kinds of diarylethenes having similar geometrical structures, bisoxazolylethene, bisthiazolylethene, and bisthienylethene have been prepared. The crystals exhibited multicolor photochromism. The colorless crystals turned yellow, red, and blue upon irradiation with the appropriate wavelength of light. The geometrical structure change of component diarylethene molecules in crystals induces reversible surface morphology as well as shape and size changes of the crystals. The photoinduced geometrical structure changes of the molecules in the densely packed crystals were successfully linked to the macro-scale mechanical motion of the solid crystals and resulted in the net task of launching a tiny silica particle.

DOI： 10.1351/pac-con-08-09-26

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Other Link： https://www.degruyter.com/downloadpdf/journals/pac/81/9/article-p1655.xml
Coordination Assemblies of [Mn4] Single-Molecule Magnets Linked by Photochromic Ligands: Photochemical Control of the Magnetic Properties Peer-reviewed

Masakazu Morimoto, Hitoshi Miyasaka, Masahiro Yamashita, Masahiro Irie

Journal of the American Chemical Society131 ( 28 ) 9823 - 9835 22 7 2009

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Authorship：Lead author Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/ja903366d

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Photochromism of diarylethene derivatives having cyclohexyl and cyclohexenyl groups in single-component crystals and a two-component mixed crystal Peer-reviewed

Masakazu Morimoto, Masahiro Irie

Tetrahedron Letters50 ( 26 ) 3404 - 3407 7 2009

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.tetlet.2009.02.139

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Absolute asymmetric photocyclization in chiral diarylethene co-crystals with octafluoronaphthalene Peer-reviewed

Masakazu Morimoto, Seiya Kobatake, Masahiro Irie

Chem. Commun. ( 3 ) 335 - 337 2008

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

DOI： 10.1039/b713694c

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Photochromic Reactions of Diarylethenes in Single Crystals with Intermolecular O-H⋅⋅⋅N Hydrogen-Bonding Networks Peer-reviewed

Masakazu Morimoto, Masahiro Irie

Chemistry - A European Journal12 ( 16 ) 4275 - 4282 24 5 2006

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/chem.200501148

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Photochromism of a diarylethene charge-transfer complex: photochemical control of intermolecular charge-transfer interaction Peer-reviewed

Masakazu Morimoto, Seiya Kobatake, Masahiro Irie

Chemical Communications ( 25 ) 2656 - 2656 2006

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Authorship：Lead author Language：Dzongkha Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

DOI： 10.1039/b604388g

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Nanolayered Structures in Photochromic Crystal of 1,2-Bis(2-methyl-5-p-methoxyphenyl-3-thienyl)perfluorocyclopentene Peer-reviewed

Seiya Kobatake, Masakazu Morimoto, Masahiro Irie

Molecular Crystals and Liquid Crystals431 ( 1 ) 523 - 527 1 6 2005

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Language：English Publishing type：Research paper (scientific journal) Publisher：Informa UK Limited

DOI： 10.1080/15421400590947306

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Crystal Engineering of Photochromic Diarylethene Derivatives by Aryl-perfluoroaryl Interaction Peer-reviewed

Masakazu Morimoto, Seiya Kobatake, Masahiro Irie

Molecular Crystals and Liquid Crystals431 ( 1 ) 529 - 534 1 6 2005

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Informa UK Limited

DOI： 10.1080/15421400590947324

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Photochromism of diarylethene single crystals: crystal structures and photochromic performance Peer-reviewed

Masakazu Morimoto, Masahiro Irie

Chemical Communications ( 31 ) 3895 - 3895 2005

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

DOI： 10.1039/b505256d

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Crystal engineering of photochromic diarylethene single crystals Peer-reviewed

Masakazu Morimoto, Seiya Kobatake, Masahiro Irie

The Chemical Record4 ( 1 ) 23 - 38 2004

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/tcr.10078

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Photochromism of diarylethenes in nanolayers of a single crystal Peer-reviewed

Masakazu Morimoto, Seiya Kobatake, Masahiro Irie

Photochemical & Photobiological Sciences2 ( 11 ) 1088 - 1088 11 2003

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1039/b307999f

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Multicolor Photochromism of Two- and Three-Component Diarylethene Crystals Peer-reviewed

Masakazu Morimoto, Seiya Kobatake, Masahiro Irie

Journal of the American Chemical Society125 ( 36 ) 11080 - 11087 9 2003

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Authorship：Lead author Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/ja035277o

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Aryl−Perfluoroaryl Interaction in Photochromic Diarylethene Crystals Peer-reviewed

Masakazu Morimoto, Seiya Kobatake, Masahiro Irie

Crystal Growth & Design3 ( 5 ) 847 - 854 1 9 2003

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/cg034076t

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Polymorphism of 1,2-Bis(2-methyl-5-p-methoxyphenyl-3-thienyl)perfluorocyclopentene and Photochromic Reactivity of the Single Crystals Peer-reviewed

Masakazu Morimoto, Seiya Kobatake, Masahiro Irie

Chemistry - A European Journal9 ( 3 ) 621 - 627 3 2 2003

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Authorship：Lead author Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/chem.200390066

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Absorption Spectra of Colored Isomer of Diarylethene in Single Crystals Peer-reviewed

Seiya Kobatake, Masakazu Morimoto, Yukako Asano, Akinori Murakami, Shinichiro Nakamura, Masahiro Irie

Chemistry Letters31 ( 12 ) 1224 - 1225 12 2002

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Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

DOI： 10.1246/cl.2002.1224

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Multi-Colored Photochromic Crystals of Diarylethene Mixtures Peer-reviewed

M. Morimoto, S. Kobatake, M. Irie

Advanced Materials14 ( 15 ) 1027 - 1027 5 8 2002

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/1521-4095(20020805)14:15<1027::aid-adma1027>3.0.co;2-f

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Books and Other Publications

未来を拓く多彩な色素材料 : エレクトロニクスから医科学にまで広がる色素の世界（日本化学会編）

森本正和（ Role： Contributor , 超解像蛍光イメージングへ向けた光スイッチ型蛍光分子の開発）

化学同人 3 2021 （ ISBN:9784759814002 ）

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Total pages：v, 194p, 図版 [4] p Language：Japanese

CiNii Books

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Photosynergetic responses in molecules and molecular aggregates (Editors: H. Miyasaka, K. Matsuda, J. Abe, T. Kawai)

Masakazu Morimoto, Masahiro Irie（ Role： Joint author , Turn-on mode photoswitchable fluorescent diarylethenes for super-resolution fluorescence microscopy (Chapter 33)）

Springer 9 2020

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Language：English Book type：Scholarly book

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光機能性有機・高分子材料における新たな息吹（監修：市村國宏）

森本正和, 入江正浩（ Role： Joint author , 光スイッチ機能をもつ蛍光分子の設計と合成（第7編・第1章））

シーエムシー出版 4 2019

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Language：Japanese Book type：Scholarly book

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光化学フロンティア：未来材料を生む有機光化学の基礎（監修：水野一彦，宮坂博，池田浩）

森本正和（ Role： Contributor , 6.3 分子結晶のフォトメカニカル効果―分子の構造変化を利用した光-力学エネルギー変換）

化学同人 10 12 2018

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Language：Japanese Book type：Scholarly book

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Photon-Working Switches (Editors: Y. Yokoyama, K. Nakatani)

M. Morimoto, M. Irie（ Role： Joint author , Turn-on mode fluorescent diarylethenes (Chapter 5)）

Springer 6 2017 （ ISBN:9784431565444 ）

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Language：English Book type：Scholarly book

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Photochromic Materials - Preparation, Properties and Applications (Editors: H. Tian, J. Zhang)

M. Morimoto, S. Kobatake, M. Irie, H. K. Bisoyi, Q. Li, S.Wang, H. Tian（ Role： Joint author , Photochromic bulk materials (Chapter 8)）

Wiley 6 2016 （ ISBN:9783527337798 ）

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Language：English Book type：Scholarly book

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Supramolecular photochemistry: controlling photochemical processes (Editors: V. Ramamurthy, Y. Inoue)

Masakazu Morimoto, Masahiro Irie（ Role： Joint author , Photochromism of multicomponent diarylethene crystals (Chapter 8)）

Wiley 27 9 2011 （ ISBN:0470230533 ）

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Language：English Book type：Scholarly book

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超分子サイエンス&テクノロジー：基礎からイノベーションまで（監修：国武豊喜）

小畠誠也, 森本正和, 入江正浩（ Role： Joint author , 第3章第2節 16. 光機能性有機分子結晶（pp 657–666））

エヌ・ティー・エス 5 2009 （ ISBN:9784860433093 ）

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Language：Japanese Book type：Scholarly book

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Presentations

Turn-on mode photoswitchable fluorescent molecules based on photochromic diarylethenes Invited International conference

Masakazu Morimoto

The 41st PhotonIcs & Electromagnetics Research Symposium (PIERS 2019 in Rome) 17 6 2019

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Language：English Presentation type：Oral presentation (invited, special)

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超解像蛍光イメージングに向けた光スイッチ型蛍光色素の研究動向 Invited

森本正和

近畿化学協会機能性色素部会第95回例会 30 1 2018

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Language：Japanese Presentation type：Public lecture, seminar, tutorial, course, or other speech

Venue：大阪科学技術センター（大阪市）

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Photochromism and mechanical performance of diarylethene single crystals Invited International conference

Masakazu Morimoto

The 39th Progress In Electromagnetics Research Symposium (PIERS 2017 in Singapore) 19 11 2017

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Language：English Presentation type：Oral presentation (invited, special)

Venue：Singapore

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フォトクロミック分子・分子結晶の光反応と物性 Invited

森本正和

日本物理学会2017年秋季大会領域5シンポジウム光物性との連成による新分野創成 21 9 2017

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Language：Japanese Presentation type：Oral presentation (invited, special)

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Photomechanical performance of diarylethene single crystals Invited

Masakazu Morimoto

日本化学会第97春季年会 Asian International Symposium -Organic Crystals- 16 3 2017

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Language：English Presentation type：Oral presentation (invited, special)

Venue：慶應義塾大学日吉キャンパス（神奈川県）

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Making and breaking bonds with light in crystals: diarylethene crystals that convert light into mechanical work Invited International conference

MORIMOTO Masakazu

Gordon Research Conference "Artificial Molecular Switches and Motors" 7 6 2015

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Language：English Presentation type：Oral presentation (invited, special)

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ジアリールエテンフォトクロミック分子結晶の結晶構造と光機能 Invited

森本正和

2014高分子・ハイブリッド材料研究センター若手フォーラム 12 12 2014

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Language：Japanese Presentation type：Oral presentation (invited, special)

Venue：東北大学

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Photochromism of diarylethene single crystals: photoinduced shape change and photomechanical performance Invited International conference

MORIMOTO Masakazu

Breaking and Making Bonds with Light Workshop 30 6 2014

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Language：English Presentation type：Oral presentation (invited, special)

Venue：Telluride Intermediate School (Colorado, USA)

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フォトクロミック分子結晶の結晶構造と多重機能

森本正和

フォトクロミック分子結晶の結晶構造と多重機能 22 3 2013

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Language：Japanese Presentation type：Oral presentation (invited, special)

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ジアリールエテン単結晶のフォトクロミズム－分子の異性化反応が誘起する結晶格子変形と光機能

森本正和

錯体化学会第62回討論会 21 9 2012

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Language：Japanese Presentation type：Oral presentation (invited, special)

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Photomechanical effect of diarylethene cocrystals International conference

MORIMOTO Masakazu, IRIE Masahiro

6th International Symposium on Organic Photochromism 17 10 2010

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Language：English Presentation type：Oral presentation (general)

Venue：Yokohama, Japan

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Crystal structures and photochromic performance of diarylethene single crystals International conference

MORIMOTO Masakazu

Second Japanese-French Workshop on NanoBioPhotonics 26 10 2009

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Language：English Presentation type：Oral presentation (invited, special)

Venue：Marseille, France

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異種複合型フォトクロミック分子結晶の結晶構造と光機能

森本正和

第58回錯体化学討論会 20 9 2008

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Language：Japanese Presentation type：Oral presentation (invited, special)

Venue：金沢大学（石川県）

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Photoactive materials based on photochromic crystals with hybrid structures International conference

MORIMOTO Masakazu, TAKAISHI Shinya, KAJIWARA Takashi, MIYASAKA Hitoshi, YAMASHITA Masahiro, IRIE Masahiro

Second International Symposium on Chemistry of Coordination Space (ISCCS 2006) 15 12 2006

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Language：English Presentation type：Oral presentation (invited, special)

Venue：Fukuoka, Japan

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ジアリールエテン単結晶の結晶構造とフォトクロミズム

森本正和

光エネルギーと物質変換シンポジウム：光合成・光触媒・太陽電池および関連化学の革新 26 11 2004

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Language：Japanese Presentation type：Oral presentation (invited, special)

Venue：金沢大学（石川県）

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Professional Memberships

有機合成化学協会

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基礎有機化学会

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アメリカ化学会

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光化学協会

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日本化学会

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Research Projects

Macroscopic functions of photomechanical hybrid materials based on bottom-up strategy

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research

Masakazu Morimoto

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4 2024 - 3 2026

Grant number：24H01157

Authorship：Principal investigator

Grant amount：\9490000 （ Direct Cost: \7300000 、 Indirect Cost：\2190000 ）

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Creation of energy conversion systems based on photoresponsive molecular crystals

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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4 2021 - 3 2023

Grant number：21H00411

Authorship：Principal investigator

Grant amount：\5200000 （ Direct Cost: \4000000 、 Indirect Cost：\1200000 ）

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Nanoscopic Visualization of Chain-Scissoring Points in Polymer Mechanochemistry

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

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4 2018 - 3 2022

Grant number：18H02050

Authorship：Principal investigator

Grant amount：\16900000 （ Direct Cost: \13000000 、 Indirect Cost：\3900000 ）

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Nano-scale and real-time fluorescence imaging of metal-corrosion reaction dynamics

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

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6 2019 - 3 2021

Grant number：19K22118

Authorship：Principal investigator

Grant amount：\6240000 （ Direct Cost: \4800000 、 Indirect Cost：\1440000 ）

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Development of advanced molecular crystals with dynamic switching performance

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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4 2019 - 3 2021

Grant number：19H05405

Authorship：Principal investigator

Grant amount：\5200000 （ Direct Cost: \4000000 、 Indirect Cost：\1200000 ）

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Development of advanced functional devices by strong coupling between hydrogen transfer and molecular photochemistry

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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4 2019 - 3 2021

Grant number：19H05064

Authorship：Principal investigator

Grant amount：\4160000 （ Direct Cost: \3200000 、 Indirect Cost：\960000 ）

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Development of Advanced Photoresponsive Molecular Systems for Super-Resolution Fluorescence Microscopy

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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4 2017 - 3 2019

Grant number：17H05272

Authorship：Principal investigator

Grant amount：\7150000 （ Direct Cost: \5500000 、 Indirect Cost：\1650000 ）

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Creation of Photoresponsive Organic Ferroelectrics with Strong Correlation between Proton Transfer and Photoisomerization Reactions

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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4 2016 - 3 2018

Grant number：16H00851

Authorship：Principal investigator

Grant amount：\5980000 （ Direct Cost: \4600000 、 Indirect Cost：\1380000 ）

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フォトクロミズムを用いた複合応答蛍光スイッチング分子システムの創出

日本学術振興会科学研究費助成事業新学術領域研究(研究領域提案型)

森本正和

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4 2015 - 3 2017

Grant number：15H01096

Authorship：Principal investigator

Grant amount：\7930000 （ Direct Cost: \6100000 、 Indirect Cost：\1830000 ）

蛍光スイッチングジアリールエテンを基本骨格として用いて、超解像蛍光顕微鏡の蛍光プローブに適用できる蛍光スイッチング分子システムを創出することを目的とした。ジアリールエテン誘導体について、光反応量子収率に対する反応点置換基の効果、イオン性置換基の導入による水溶化、および可視光照射による閉環反応の誘起を検討した。
反応点にイソブチル基を有するジアリールエテンを新規に合成し、光反応量子収率に対する反応点置換基の効果を検討した。反応点にイソブチル基を導入すると、従来のエチル基を有する分子に比べて、光閉環反応量子収率および閉環体の蛍光量子収率は大きく減少することなく、光開環反応量子収率が増大することを見出した。光開環反応量子収率を制御する上での反応点置換基の有効性が示唆された。
バイオイメージングへの応用に向けて、スルホン酸ナトリウムを有する水溶性ジアリールエテンを合成した。この分子は水に溶解し、水中においてフォトクロミズムと蛍光スイッチングを示した。
新しい光励起法として、可視光の照射によるジアリールエテンの閉環反応の誘起について検討した。光開環反応量子収率が著しく小さいジアリールエテン誘導体の溶液に可視光を照射すると、低い反応変換率で閉環体が生成することが観測された。この分子を染み込ませたろ紙やこの分子の単結晶についても、可視光の照射による閉環体の生成が認められた。A01宮坂グループとの共同研究により、蛍光スイッチングジアリールエテンに対して単一波長の可視レーザー光を照射した際の蛍光挙動を観測したところ、光異性化反応に伴う単一分子レベルでの蛍光ON/OFFスイッチングが観測され、その蛍光スポットを解析・積算することで超解像蛍光画像を構築できることが分かった。
超解像蛍光顕微鏡への応用に向けた分子設計指針を明らかにし、可視光照射による単一光源型超解像蛍光顕微鏡の可能性を見出した。

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Photo-electro conversion using photochromic piezoelectric crystals

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

MORIMOTO Masakazu

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4 2014 - 3 2017

Grant number：26410101

Authorship：Principal investigator

Grant amount：\5070000 （ Direct Cost: \3900000 、 Indirect Cost：\1170000 ）

Some photochromic diarylethene molecules formed polar crystal structures belonging to non-centrosymmetric space groups. X-Ray crystallographic analysis revealed that photoisomerization of the diarylethene molecule induces reversible deformation of the crystal lattice of the polar crystal. Diarylethene molecules having thienopyridine or quinoline groups formed cocrystals with other molecules via intermolecular hydrogen bonds or halogen bonds, which would be utilized as a non-covalent interaction for controlling the crystal structure of diarylethene.

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光応答性分子結晶の構造変化による固体物性制御

日本学術振興会科学研究費助成事業新学術領域研究(研究領域提案型)

森本正和

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4 2014 - 3 2016

Grant number：26104537

Authorship：Principal investigator

Grant amount：\6760000 （ Direct Cost: \5200000 、 Indirect Cost：\1560000 ）

外部刺激に柔軟に応答する柔らかな分子系における高度な分子集積と機能創成に関する研究として、フォトクロミック分子の光異性化反応に伴う構造変化により固体物性を可逆的に制御できる分子結晶を創出することを目的とした。
応答波長の異なる２種のフォトクロミック分子からなる２成分混晶の光誘起結晶変形を観測した。紫外光照射により青色の異性体を生成する分子（A）および赤色の異性体を生成する分子（B）を含む混晶を合成した。無色の針状結晶に紫外光を照射すると、AとBの両方の構造変化により、結晶は紫色に着色するとともに屈曲変形を示した。そのあと、Aの青色の異性体のみが吸収する750 nm光を照射すると、Aの退色反応が選択的に進行し、結晶の屈曲は一部解消されたが、B由来の屈曲が残った。さらに、500 nm以上の可視光を照射すると、Bの退色反応が起こり、結晶はもとのまっすぐな形に戻った。２種のフォトクロミック分子を同一結晶内で複合化し、照射光の波長を選択することで、２成分の構造変化を反映した結晶変形の制御が可能であることが示唆された。
誘電物性の光制御に向けて、分子間水素結合を有するフォトクロミック分子結晶を合成した。水素結合性のイミダゾールを有するフォトクロミック分子は、結晶中において分子間プロトン移動を示し得る水素結合一次元鎖を形成していることが示唆された。単結晶の電気物性を測定したところ、誘電率の温度依存性・電場周波数依存性が観測された。また、このフォトクロミック分子は結晶中での光異性化反応が可能な立体配座に固定されており、紫外光と可視光の照射による結晶の可逆的なフォトクロミズムが観測された。
フォトクロミック分子の構造変化により高度なメカニカル機能を示す分子結晶を見出し、誘電物性の光制御に向けた水素結合性フォトクロミック分子結晶の設計に関する知見を得た。

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光が内包する波長情報を読み取り多彩に運動する有機結晶アクチュエーターの開発

民間財団等徳山科学技術振興財団研究助成

森本正和

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5 2014 - 5 2015

Authorship：Principal investigator Grant type：Competitive

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フォトクロミック反応とプロトン移動現象の融合による光応答性強誘電体の開発

民間財団等池谷科学技術振興財団単年度研究助成

森本正和

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4 2014 - 3 2015

Authorship：Principal investigator Grant type：Competitive

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単分子メモリ機能を指向した光応答性金属錯体の開発

民間財団等倉田記念日立科学財団倉田奨励金

森本正和

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4 2013 - 3 2015

Authorship：Principal investigator Grant type：Competitive

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フォトクロミック反応による有機強誘電体の光応答機能の創出

民間財団等住友財団基礎科学研究助成

森本正和

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11 2012 - 5 2014

Authorship：Principal investigator Grant type：Competitive

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Photochemical control of organic ferroelectric crystals by using hydrogen-bonding photochromic molecules

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

MORIMOTO Masakazu

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4 2012 - 3 2014

Grant number：24750136

Authorship：Principal investigator

Grant amount：\4550000 （ Direct Cost: \3500000 、 Indirect Cost：\1050000 ）

In order to create photoresponsive organic ferroelectrics that change their physical properties arising from intermolecular proton transfer upon structural transformation of photochromic molecules, we designed and synthesized new photochromic diarylethene derivatives bearing an imidazole ring with hydrogen-bonding ability. Most of the derivatives formed one-dimensional chain structures by intermolecular hydrogen-bonding interactions and underwent photochromic reactions in the single-crystalline phase. In addition, we observed enantioselective photochemical reactions in hydrogen-bonding cocrystals composed of photochromic molecules and other chiral molecules.

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フォトクロミック分子の光異性化反応が誘起する結晶格子変形を利用した物性制御

立教大学立教大学学術推進特別重点資金（立教SFR）

森本正和

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4 2011 - 3 2012

Authorship：Principal investigator Grant type：Competitive

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光機能性有機強誘電結晶の創製

科学技術振興機構戦略的創造研究推進事業さきがけ

森本正和

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4 2007 - 3 2011

Authorship：Principal investigator Grant type：Competitive

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Photochemical Control of Donor-Acceptor Interactions in Photochromic Charge-Transfer Complexes

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

MORIMOTO Masakazu

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4 2007 - 3 2009

Grant number：19750023

Authorship：Principal investigator

Grant amount：\3120000 （ Direct Cost: \2700000 、 Indirect Cost：\420000 ）

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超高密度メモリデバイスを指向した単分子磁性光スイッチングシステムの構築

立教大学立教大学学術推進特別重点資金（立教SFR）

森本正和

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6 2007 - 3 2008

Authorship：Principal investigator Grant type：Competitive

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フォトクロミック反応による金属錯体ナノ量子磁石の光スイッチング

東北大学東北大学若手研究者萌芽研究育成プログラム

森本正和

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9 2006 - 3 2007

Authorship：Principal investigator Grant type：Competitive

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異種分子複合型光機能性フォトクロミック単結晶の開発

日本学術振興会科学研究費助成事業特別研究員奨励費

森本正和

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4 2004 - 3 2006

Grant number：04J06592

Authorship：Principal investigator

Grant amount：\1900000 （ Direct Cost: \1900000 ）

通常の単一成分結晶では達成できない新規な光機能の発現を目指して、ジアリールエテン分子と異種分子との複合結晶を作製し、その結晶構造とフォトクロミック反応挙動を検討した。
昨年度はジアリールエテン分子と蛍光分子との複合結晶を作製したが、それはジアリールエテンの結晶に蛍光分子が5%ほど混合した固溶体であった。結晶の組成と分子配列をより高度に制御するための分子間相互作用として水素結合を検討した。カルボキシル基を有するジアリールエテンは、単結晶中においてカルボキシル基間の水素結合により環状4量体構造を形成し、反応活性なコンフォーマーと反応不活性なコンフォーマーが1:1の比で存在していた。ビピリジンと混合して再結晶すると、ジアリールエテンとビピリジンを1:1の組成で含む単結晶が得られた。これらの結晶においては、カルボキシル基とピリジル基の間の水素結合により一次元鎖や二次元シートなどの分子集合体が形成され、すべてのジアリーエテン分子が反応活性なコンフォメーションに固定された。また、カルボキシル基部分のコンフォメーションに依存して、結晶によって着色体の吸収スペクトルのシフトが認められた。結晶構造と反応性を制御する上での分子間水素結合の有用性が示された。
電気伝導度の光制御を目指して、ジアリールエテン部位を含む電荷移動錯体のフォトクロミズムを検討した。電子供与性のフェニレンジアミン部位を有するジアリールエテンを電子受容性分子と溶液中で混合すると、電荷移動錯体とラジカルイオンを形成した。ジアリールエテンのフォトクロミック反応に伴い、2つの異性体の酸化電位の違いを反映して、電荷移動錯体とラジカルイオンの生成量が変化した。フォトクロミック反応により分子間の電荷移動相互作用を制御できることが示された。また、この電荷移動錯体は1:1の組成の単結晶を形成し、結晶状態においてもフォトクロミズムを示した。

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Social Contribution

神奈川県立川和高等学校出張授業

11 2012

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豊島区理科実験実技研修会

8 2008

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