Updated on 2021/06/22

写真b

 
NAKAZONO Takashi
 
*Items subject to periodic update by Rikkyo University (The rest are reprinted from information registered on researchmap.)
Affiliation*
College of Science Department of Chemistry
Title*
Assistant Professor
Degree
博士(理学) ( 九州大学 )
Contact information
Mail Address
Research Interests
  • 錯体化学

  • Campus Career*
    • 4 2017 - Present 
      College of Science   Department of Chemistry   Assistant Professor
     

    Research Areas

    • Nanotechnology/Materials / Inorganic/coordination chemistry

    Research History

    • 4 2017 - Present 
      RIKKYO UNIVERSITY   College of Science Department of Chemistry   Assistant Professor

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    Education

    • 4 2012 - 3 2017 
      Kyushu University   Graduate School, Division of Chemistry

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      Country: Japan

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    • 4 2008 - 3 2012 
      Kyushu University   Faculty of Science

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      Country: Japan

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    Papers

    • Highly Efficient and Selective Photocatalytic CO2 Reduction to CO in Water by a Cobalt Porphyrin Molecular Catalyst Peer-reviewed

      Arnau Call, Mihaela Cibian, Keiya Yamamoto, Takashi Nakazono, Kosei Yamauchi, Ken Sakai

      ACS Catalysis   2019

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

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    • Mechanisms of Water Oxidation using Ruthenium, Cobalt,Copper, and Iron Molecular Catalysts Invited Peer-reviewed

      Alexander Rene Parent, Takashi Nakazono, Yuta Tsubonouchi, Natsuki Taira, Ken Sakai

      Advances in Inorganic Chemistry   2019

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

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    • Highly stable chemisorption of dyes with pyridyl anchors over TiO2: application in dye-sensitized photoelectrochemical water reduction in aqueous media Peer-reviewed

      Kohei Takijiri, Kohei Morita, Takashi Nakazono, Ken Sakai, Hironobu Ozawa

      CHEMICAL COMMUNICATIONS53 ( 21 ) 3042 - 3045   3 2017

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

      A polypyridyl ruthenium sensitizer possessing pyridyl anchors (Ru-py) forms much stronger chemical linkages to TiO2 surfaces compared to the conventional carboxylate and phosphonate ones. A highly stable dye-sensitized photoelectrochemical cell for water reduction is successfully demonstrated using this technique.

      DOI: 10.1039/c6cc10321a

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    • Photochemical H2 Evolution Catalyzed by Porphyrin-based Cubic Cages Singly and Doubly Encapsulating PtCl2(4,4’-dimethyl-2,2’-bipyridine) Peer-reviewed

      Shota Tanaka, Takashi Nakazono, Kosei Yamauchi, Ken Sakai

      Chem. Lett.   2017

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

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    • Photochemical Water Oxidation Catalyzed by a Water-Soluble Copper Phthalocyanine Complex Peer-reviewed

      Ryota Terao, Takashi Nakazono, Alexander Rene Parent, Ken Sakai

      CHEMPLUSCHEM81 ( 10 ) 1064 - 1067   10 2016

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

      Copper tetrasulfonatophthalocyanine (CuPcTS) is reported to serve as a catalyst for photochemical water oxidation via a radical coupling mechanism. Chloride greatly inhibits the water oxidation rate as a result of axial chloride binding to CuPcTS, preventing formation of the Cu oxyl or hydroxyl intermediate required for O-O bond formation.

      DOI: 10.1002/cplu.201600263

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    • Improving the robustness of cobalt porphyrin water oxidation catalysts by chlorination of aryl groups Peer-reviewed

      Takashi Nakazono, Ken Sakai

      DALTON TRANSACTIONS45 ( 32 ) 12649 - 12652   8 2016

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

      The water oxidation (WO) activity of a chlorinated cobalt tetraphenylporphyrin (CoClPS), possessing Cl atoms on the 2,6-positions of the aryl groups, shows higher resistance to attack by singlet oxygen, in situ generated during photochemical WO using Ru(bpy)(3)(2+) and S2O82- with the turnover frequency (TOF) and turnover number (TON) reaching 1.7 s(-1) and 836, respectively.

      DOI: 10.1039/c6dt02535h

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    • Improving Singlet Oxygen Resistance during Photochemical Water Oxidation by Cobalt Porphyrin Catalysts Peer-reviewed

      Takashi Nakazono, Alexander R. Parent, Ken Sakai

      CHEMISTRY-A EUROPEAN JOURNAL21 ( 18 ) 6723 - 6726   4 2015

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-V C H VERLAG GMBH  

      Enabling the production of solar fuels on a global scale through artificial photosynthesis requires the development of water oxidation catalysts with significantly improved stability. The stability of photosystems is often reduced owing to attack by singlet oxygen, which is produced during light harvesting. Here, we report photochemical water oxidation by CoFPS, a fluorinated Co-porphyrin designed to resist attack by singlet oxygen. CoFPS exhibits significantly improved stability relative to its non-fluorinated analogue, as shown by a large increase in turnover numbers. This increased stability results from resistance of CoFPS to attack by singlet oxygen, the formation of which was monitored in situ by using 9,10-diphenylanthracene as a chemical probe. Dynamic light scattering (DLS) confirms that CoFPS remains homogeneous, proving its stability during water oxidation catalysis.

      DOI: 10.1002/chem.201500716

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    • Mechanism of water oxidation by non-heme iron catalysts when driven with sodium periodate Peer-reviewed

      Alexander R. Parent, Takashi Nakazono, Shu Lin, Satoshi Utsunomiya, Ken Sakai

      DALTON TRANSACTIONS43 ( 33 ) 12501 - 12513   9 2014

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

      Iron tris(2-methylpyridyl)amine (TPA) and iron 1-(bis(2-methylpyridyl)amino)-2-methyl-2-propanoate (BPyA) salts are characterized as water oxidation catalysts (WOCs) using sodium periodate. Under the conditions used, these complexes serve as homogeneous WOCs as demonstrated via kinetic analysis and dynamic light scattering (DLS). The Fe(BPyA) salt serves as both a mononuclear and dinuclear catalyst, with the mononuclear form showing higher catalytic activity. Based on the H/D kinetic isotope effect and pH dependence, the rate determining step (RDS) in water oxidation (WO) by Fe(BPyA) is nucleophilic attack by water during O-O bond formation. In contrast, Fe(TPA) shows complex kinetic behavior due to the formation of multiple oxidation states of the complex in solution, each of which exhibits catalytic activity for WO. The RDS in WO by Fe(TPA) follows an equilibrium established between monomeric and dimeric forms of the catalyst. Under acidic conditions formation of the monomer is favored, which leads to an increase in the WO rate.

      DOI: 10.1039/c4dt01188k

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    • Cobalt porphyrins as homogeneous catalysts for water oxidation Peer-reviewed

      Takashi Nakazono, Alexander Rene Parent, Ken Sakai

      CHEMICAL COMMUNICATIONS49 ( 56 ) 6325 - 6327   2013

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      Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

      Three water-soluble cobalt porphyrins have been investigated as water oxidation catalysts via photo-initiation using Ru-II(bpy)(3)(2+)/Na2S2O8. The pH dependence of the turnover frequency revealed maximum activity at pH 11. Based on the second order dependence on catalyst concentration for the rate of water oxidation, we suggest a bimolecular radical coupling process as the rate determining step.

      DOI: 10.1039/c3cc43031f

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    Books and Other Publications

    • 人工光合成 ―システム構築に向けての最新技術動向と展望―「金属錯体触媒による新規な酸素発生反応」

      中薗孝志, 酒井 健( Role: Contributor)

      シーエムシー出版  2013 

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      Language:Japanese Book type:Scholarly book

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    Professional Memberships