Development of novel photofunctional materials with linear and ring-shaped rhenium(I) multinuclear complexes as the central molecules

2019 Fiscal Year Final Research Report

• Project/Area Number: 17H01198
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Ishitani Osamu 東京工業大学, 理学院, 教授 (50272282)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: リング状レニウム（I）多核錯体 / Keggin型ポリ酸 / 光物性 / CO2還元 / 光触媒 / 超分子

Outline of Final Research Achievements

We developed coupling methods of ring-shaped Re multinuclear complexes (Ring) with another or other metal complex(es). These methods can be applied to introduction of (1) a Ru(II) complex, (2) a Re(I) complex, and (3) another Ring (Ring-Ru, Ring-Re, Ring-Ring): Ring-Ru and Ring-Ring showed high light-harvesting abilities, and Ring-Re worked as an efficient photocatalyst for CO2 reduction.
We successfully synthesized 1:1 supramolecules of Ring and Keggin-type heteropolyoxometalate (Ring-POM) in good yields. Ring-POM could photochemically accumulate multi electrons in one molecule, and work as a new type of redox photosensitizers, which can mediate stepwise electron transfer.

Free Research Field

光反応化学

Academic Significance and Societal Importance of the Research Achievements

光増感剤や発光材料として機能するRingに、別種の錯体を導入することで、従来に無い光機能性分子へ転換できることを証明した。今後、人工光合成や有機合成などの分野に応用されることが期待される。Ringとヘテロポリ酸の複合体を多電子レドックス光増感剤として用い、錯体触媒によるCO2還元反応の機構に関する重要な情報を得たことは、より高機能なCO2還元光触媒系を開発するための新たな分子設計指針を与える。