2023 Fiscal Year Final Research Report
Efficient photocatalytic CO2 reduction using reversible complexation of the first-raw transition metal complexes
| Project/Area Number |
21K05082
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 34010:Inorganic/coordination chemistry-related
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| Research Institution | Gunma University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | CO2還元 / 光触媒 / 第一遷移金属元素 / Feイオン / ビピリジン / フェナントロリン / トリエタノールアミン / プロトン共役電子移動 |
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| Outline of Final Research Achievements |
In this study, a new catalytic reaction taking advantage of weak formation ability of the first-low transition metal complexes was developed to construct efficient photocatalytic system for CO2 reduction using metal complexes made from earth-abundant metals. It was found that the "mixed catalyst" consisting of Fe ion with medium oxidation state, aromatic diimine ligands, and stabilizer of metal ions proceeds photocatalytic CO2 reduction maintaining the dissociated state between the Fe ion and the ligand by visible-light irradiation in the presence of a Cu-complex photosensitizer and a reductant. Thus, the photocatalytic CO2 reduction characteristic for the first-low metal ions was constructed, in which the reaction proceeds efficiently even in the absence of a defined structure of metal-complexes as a catalyst.
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| Free Research Field |
金属錯体の光化学
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| Academic Significance and Societal Importance of the Research Achievements |
これまで、Feイオンといった金属錯体を触媒として用いようとした場合、金属錯体としての構造を維持することがCO2還元光触媒反応の向上に大きく寄与していた。これに対し本研究では、金属錯体の構成成分（金属イオンと配位子）が反応溶液中で安定な分解状態のままCO2還元を進行できる新奇な光触媒反応系を構築した。この原理を用いた光触媒系を設計することにより、地殻中豊富に存在する金属種を有効利用した高効率なCO2還元光触媒を作り出すことができる。
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