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Development of the Redox Photocatalysts with Strong S-T Absorption

Research Project

Project/Area Number 20K20367
Project/Area Number (Other) 18H05355 (2018-2019)
Research Category

Grant-in-Aid for Challenging Research (Pioneering)

Allocation TypeMulti-year Fund (2020)
Single-year Grants (2018-2019)
Review Section Medium-sized Section 34:Inorganic/coordination chemistry, analytical chemistry, and related fields
Research InstitutionTokyo Institute of Technology

Principal Investigator

Ishitani Osamu  東京工業大学, 理学院, 教授 (50272282)

Co-Investigator(Kenkyū-buntansha) 玉置 悠祐  東京工業大学, 理学院, 助教 (10752389)
Project Period (FY) 2018-06-29 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥26,000,000 (Direct Cost: ¥20,000,000、Indirect Cost: ¥6,000,000)
Fiscal Year 2021: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2019: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywords光反応化学 / レドックス光増感錯体 / S-T吸収 / 光触媒反応
Outline of Research at the Start

本来は禁制遷移である光増感錯体の一重項-三重項遷移(S-T遷移:基底状態から3MLCT励起状態への直接遷移)の遷移確率を飛躍的に向上させる新手法の開発を目指す。S-T吸収帯を強く発現できれば、反応に必要な性質を維持したまま、吸収できる光の波長領域をはるかに長波長側に拡大することができる。

Outline of Final Research Achievements

In order to utilize solar light efficiently, absorption of longer-wavelength visible-light is highly important. In this study, therefore, we have focused on developing the redox photosensitizer expressing S-T absorption, that is originally forbidden direct transitions from ground state to the triplet excited states.
We have found that the heteroleptic ruthenium complexes having two different tridentate ligands function as a redox photosensitizer exhibiting S-T absorption. Based on the results using ligands with various electronic and steric characters, the ruthenium complexes having push-pull type configuration of tridentate ligands expressed strong S-T absorption and absorbed light shorter than 720 nm. The osmium complex with similar ligands absorbed entire wavelength range of visible light up to 800 nm and functioned as a redox photosensitizer.

Academic Significance and Societal Importance of the Research Achievements

太陽光を有効に利用するには、長波長の光を活用することが不可欠である。従来の方法で光増感剤の吸収を長波長化すると、光増感剤に深刻な機能低下を引き起こしてしまう。本研究では、S-T吸収により光増感剤の機能を維持したまま、長波長の可視光を利用することに成功した。S-T吸収を発現できるルテニウム錯体の分子設計を明らかにできたことは、光化学の学術面で非常に意義深いものである。また可視光の全波長領域を利用できる光増感剤は、様々な光反応を可視光全域で駆動できる可能性がある。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (25 results)

All 2022 2021 2020 2019 2018 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (21 results) (of which Int'l Joint Research: 6 results,  Invited: 3 results) Remarks (1 results)

  • [Journal Article] Photocatalytic Systems for CO<sub>2</sub> Reduction: Metal-Complex Photocatalysts and Their Hybrids with Photofunctional Solid Materials2022

    • Author(s)
      Kumagai Hiromu、Tamaki Yusuke、Ishitani Osamu
    • Journal Title

      Accounts of Chemical Research

      Volume: 55 Issue: 7 Pages: 978-990

    • DOI

      10.1021/acs.accounts.1c00705

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of a panchromatic photosensitizer and its application to photocatalytic CO<sub>2</sub> reduction2021

    • Author(s)
      Irikura Mari、Tamaki Yusuke、Ishitani Osamu
    • Journal Title

      Chemical Science

      Volume: 12 Issue: 41 Pages: 13888-13896

    • DOI

      10.1039/d1sc04045f

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Factors determining formation efficiencies of one-electron-reduced species of redox photosensitizers2020

    • Author(s)
      Ozawa Kyohei、Tamaki Yusuke、Kamogawa Kei、Koike Kazuhide、Ishitani Osamu
    • Journal Title

      The Journal of Chemical Physics

      Volume: 153 Issue: 15 Pages: 154302-154302

    • DOI

      10.1063/5.0023593

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] TADF有機分子を光増感剤として用いたCO2還元光触媒反応2022

    • Author(s)
      井上 麗、玉置 悠祐、石谷 治
    • Organizer
      日本化学会第102春季年会(2022)
    • Related Report
      2021 Annual Research Report
  • [Presentation] 銅錯体光増感部を有するCO2還元超分子光触媒の開発2022

    • Author(s)
      石森 俊哉、玉置 悠祐、石谷 治
    • Organizer
      日本化学会第102春季年会(2022)
    • Related Report
      2021 Annual Research Report
  • [Presentation] New Achievements of Photocatalytic CO2 Reduction2021

    • Author(s)
      石谷治
    • Organizer
      APC 2021( the 11th Asian Photochemistry Conference)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Ruthenium(II) heteroleptic bis-tridentate complexes as a photosensitizer with wide-band absorption2021

    • Author(s)
      Yusuke Tamaki, Osamu Ishitani
    • Organizer
      Pacifichem2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 可視光全波長を活用できるレドックス光増感剤の開発とCO2還元光触媒反応への応用2021

    • Author(s)
      入倉 茉里、玉置 悠祐、石谷 治
    • Organizer
      日本化学会 第101春季年会 (2021)
    • Related Report
      2020 Research-status Report
  • [Presentation] 低過電圧でCO2を還元するRu(II)触媒の開発2021

    • Author(s)
      渡邊 裕春、玉置 悠祐、石谷 治
    • Organizer
      日本化学会 第101春季年会 (2021)
    • Related Report
      2020 Research-status Report
  • [Presentation] Ruthenium heteroleptic bis-tridentate complex as a photosensitizer utilizing longer-wavelength light2020

    • Author(s)
      Yusuke Tamaki, Riho Murakoshi, Osamu Ishitani
    • Organizer
      2020年web光化学討論会
    • Related Report
      2020 Research-status Report
  • [Presentation] 可視光全域を吸収する光増感剤によるCO2還元触媒反応2020

    • Author(s)
      入倉 茉里、玉置 悠祐、石谷 治
    • Organizer
      2020年web光化学討論会
    • Related Report
      2020 Research-status Report
  • [Presentation] Quaterpyridine配位子を有するRu(II)錯体のCO2還元光触媒反応2020

    • Author(s)
      渡邊 裕春, 玉置 悠祐, 石谷治
    • Organizer
      錯体化学会第70回討論会
    • Related Report
      2020 Research-status Report
  • [Presentation] CuIMIIIO2(M= Al, Cr, Ga) p 型半導体を用いた CO2還元用分子光カソードの開発2020

    • Author(s)
      江波戸 陽介・熊谷 啓・石谷 治
    • Organizer
      日本化学会 第100春季年会 (2020)
    • Related Report
      2019 Annual Research Report
  • [Presentation] Catalysis of Ru(II) complexes with a quaterpyridine ligand2020

    • Author(s)
      Hiroharu WATANABE, Yusuke TAMAKI, Osamu ISHITANI
    • Organizer
      日本化学会 第100春季年会 (2020)
    • Related Report
      2019 Annual Research Report
  • [Presentation] Redox photosensitizer using ruthenium(II) complexes toward wide-band absorption by S-T transitions2020

    • Author(s)
      Yusuke TAMAKI, Osamu ISHITANI
    • Organizer
      日本化学会 第100春季年会 (2020)
    • Related Report
      2019 Annual Research Report
  • [Presentation] Redox Photosensitizing Function of Ruthenium(II) Bis-Tridentate Complex with Wideband Absorption Utilizing Singlet-to-Triplet Transitions2019

    • Author(s)
      Yusuke Tamaki
    • Organizer
      The 23rd International Symposium on the Photochemistry and Photophysics of Coordination Compounds (ISPPCC 2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Photocatalytic reduction of CO2 using multinuclear metal complexes2019

    • Author(s)
      Yusuke Tamaki
    • Organizer
      Materials Challenges in Alternative and Renewable Energy 2019 (MCARE 2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] S-T 遷移による長波長光利用を志向した Ru(II) 光増感錯体の開発2019

    • Author(s)
      玉置 悠祐 ・石谷 治
    • Organizer
      2019年光化学討論会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Development of Redox Photosensitizer with Wide-Band Absorption Using Ruthenium(II) Bis-Tridentate Complex2019

    • Author(s)
      Yusuke Tamaki
    • Organizer
      3rd International Solar Fuels Conference and International Conference on Artificial Photosynthesis-2019 (ISF-3/ICARP2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Redox photosensitizing function of ruthenium(II) complexes with tridentate ligands2019

    • Author(s)
      Yusuke TAMAKI, Osamu ISHITANI
    • Organizer
      日本化学会第99春季年会(2019)
    • Related Report
      2018 Annual Research Report
  • [Presentation] 半導体との複合化を志向したレドックス光増感ルテニウム(Ⅱ)錯体の開発2018

    • Author(s)
      村越莉帆・玉置悠祐・芳賀正明・石谷治
    • Organizer
      錯体化学会第68回討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 一重項-三重項遷移を利用したルテニウム(II)光増感錯体の高機能化2018

    • Author(s)
      玉置悠祐・石谷治
    • Organizer
      第30回配位化合物の光化学討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Photocatalytic systems for CO2 reduction consisting of metal complexes and semiconductors2018

    • Author(s)
      Osamu Ishitani
    • Organizer
      The 22nd International Conference on Photochemical Conversion and Storage of Solar Energy (IPS-22)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] CO2資源化を目指した人工光合成の開発:現状と将来展望2018

    • Author(s)
      石谷治
    • Organizer
      石油化学部会シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Remarks] 東京工業大学 理学院 化学系 石谷研究室

    • URL

      http://www.chemistry.titech.ac.jp/~ishitani/index.html

    • Related Report
      2021 Annual Research Report 2019 Annual Research Report

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Published: 2018-07-20   Modified: 2024-03-26  

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