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Photoisomerization of Metal Complexes as a Key Component toward Artificial Water Splitting

Research Project

Project/Area Number 17K18433
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Functional solid state chemistry
Energy-related chemistry
Research Institution防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群)

Principal Investigator

Hirahara Masanari  防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群), 応用科学群, 講師 (90609835)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords人工光合成 / 水の酸化 / 光異性化 / 光化学 / ルテニウム / 金属錯体 / ベシクル / 配位子置換反応 / 光反応 / 置換基効果 / 光エネルギー変換
Outline of Final Research Achievements

In this research project, we focused on molecular catalysts that reversibly isomerize by light and heat toward a multi-stimuli-responsive and flexible artificial photosynthesis. In the first year and the second year, the structural factors on photo- and thermal-isomerization were synthetically clarified. In the third year, an asymmetric ruthenium complex bearing ethoxy substituent near metal center was synthesized and fully characterized. The ruthenium complex displayed photoisomerization and thermal-back isomerization reactions. The turnover frequency of water oxidation differed four times between the two isomers . Light irradiation to an aqueous solution of the ruthenium complex resulted in the increase of catalytic activity due to the photoisomerization, while heating of the light-irradiated solution resulted recovery of the original catalytic activity. We, thus, achieved control of water oxidation catalytic activity by external stimulation.

Academic Significance and Societal Importance of the Research Achievements

人工光合成の実現は社会的に実現すべき喫緊の課題であるが、天然の光合成と人工光合成には大きな隔たりがある。特に、天然の光合成に見られるような外部刺激に応答した触媒活性の制御と自律性は超えるべきハードルである。本研究課題では水の分解反応の半反応である水の酸化反応において外部刺激応答性を示す分子触媒の検討を行った。この中で、錯体の外部刺激応答性に関する分子設計指針を確立した。さらに、外部刺激応用性の錯体を用いた水の酸化触媒反応において、刺激に応答した触媒活性の変化が確認された。この成果は今後の柔軟な反応系を構築する上で重要な指針となりうると期待される。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2019 2018 2017

All Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] Critical Hammett Electron-Donating Ability of Substituent Groups for Efficient Water Oxidation Catalysis by Mononuclear Ruthenium Aquo Complexes2019

    • Author(s)
      Watabe Shunsuke、Tanahashi Yuki、Hirahara Masanari、Yamazaki Hirosato、Takahashi Kosuke、Mohamed Eman A.、Tsubonouchi Yuta、Zahran Zaki N.、Saito Kenji、Yui Tatsuto、Yagi Masayuki
    • Journal Title

      Inorganic Chemistry

      Volume: 58 Issue: 19 Pages: 12716-12723

    • DOI

      10.1021/acs.inorgchem.9b01623

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Photoisomerization and thermal isomerization of ruthenium aqua complexes with chloro-substituted asymmetric bidentate ligands2019

    • Author(s)
      M. Hirahara, H. Goto, Rei. Yamamoto, M. Yagi, and Y. Umemura
    • Journal Title

      RSC Advances

      Volume: 9 Issue: 4 Pages: 2002-2010

    • DOI

      10.1039/c8ra08943d

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Molecular Mimics of Heterogeneous Metal Phosphides: Thermochemistry, Hydride-Proton Isomerism, and HER Reactivity2018

    • Author(s)
      Buss Joshua A.、Hirahara Masanari、Ueda Yohei、Agapie Theodor
    • Journal Title

      Angewandte Chemie International Edition

      Volume: 57 Issue: 50 Pages: 16329-16333

    • DOI

      10.1002/anie.201808307

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Mechanistic Insight into Reversible Core Structural Changes of Dinuclear μ-Hydroxoruthenium(II) Complexes with a 2,8-Di-2-pyridyl-1,9,10-anthyridine Backbone Prior to Water Oxidation Catalysis2017

    • Author(s)
      Hirahara Masanari、Nagai Sho、Takahashi Kosuke、Watabe Shunsuke、Sato Taisei、Saito Kenji、Yui Tatsuto、Umemura Yasushi、Yagi Masayuki
    • Journal Title

      Inorganic Chemistry

      Volume: 56 Issue: 17 Pages: 10235-10246

    • DOI

      10.1021/acs.inorgchem.7b00978

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Photoresponsive Water Oxidation Catalyst: Visible-light-induced morphological changes of vesicles and LB films2019

    • Author(s)
      Masanari Hirahara
    • Organizer
      International Conference on Photocatalysis and Photoenergy 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Photoresponsive Ruthenium Aqua Complexes: Visible-Light-Induced Morphological Changes of Vesicles2019

    • Author(s)
      Masanari Hirahara, Hiroki Goto and Yasushi Umemura
    • Organizer
      The 23rd International Symposium on the Photochemistry and Photophysics of Coordination Compounds
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 分子内水素結合を有するルテニウムピラゾール錯体の光化 学的合成2019

    • Author(s)
      平原 将也, 山本 玲, 内田 恭平, 梅村 泰史
    • Organizer
      第31回配位化合物の光化学討論会, O-01A
    • Related Report
      2019 Annual Research Report
  • [Presentation] New Photochemical Synthesis of Ruthenium Complexes with Intramolecular Hydrogen Bonding via Successive Photosubstitution Reactions2019

    • Author(s)
      Masanari Hirahara, Kyohei Uchida, Rei Yamamoto, Yasushi Umemura
    • Organizer
      錯体化学会第69回討論会、3Ac-02
    • Related Report
      2019 Annual Research Report
  • [Presentation] 外部刺激応答性を示すルテニウムアクア錯体単分子膜の性質2019

    • Author(s)
      後藤寛紀、平原 将也、梅村泰史
    • Organizer
      日本化学会第99回春季年会
    • Related Report
      2018 Research-status Report
  • [Presentation] ピラゾールーピラゾラト分子内水素結合を有するルテニウム錯体の光配位子置換反応2019

    • Author(s)
      平原将也、山本 玲、内田恭平、梅村泰史
    • Organizer
      日本化学会第99回春季年会
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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