| Autor: |
Takeda, Hiroyuki, Irimajiri, Mina, Mizutani, Toshihide, Nozawa, Shunsuke, Matsuura, Yuna, Kurosu, Masao, Ishitani, Osamu |
| Zdroj: |
Inorganic Chemistry; 20240101, Issue: Preprints |
| Abstrakt: |
This study reports on efficient photocatalytic CO2reduction reactions using mixed catalytic systems of an Fe ion source and various 1,10-phenanthroline derivatives (R1R2p) as ligands in the presence of triethanolamine (TEOA). As the relatively bulky substituents at positions 2 and 9 of R1R2pweakened the ability to coordinate to the Fe ion, the Fe ion formed TEOA complexes. The free R1R2paccepted an electron from the reduced photosensitizer through proton-coupled electron transfer (PCET) using protons of TEOA dissolved in a CH3CN solution in a CO2atmosphere as the initial step of the catalytic cycle. Although the mixed system of the nonsubstituted 1,10-phenanthroline generates a stable tris(phenanthroline)–Fe(II) complex in solution, this complex could not function as a CO2reduction catalyst. The mechanism in which R1R2pinteracts with the Fe ion after PCET was proposed for this efficient photocatalytic CO2reduction. The proposed photocatalytic system using the 2,9-di-sec-butyl-phenanthroline ligand could produce CO with high efficiency (quantum yield of 8.2%) combined with a dinuclear Cu(I) complex as a photosensitizer. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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