Photocatalytic CO2 Reduction under Visible-Light Irradiation by Ruthenium CNC Pincer Complexes |
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Authors: | Prof. Dr. Yasuhiro Arikawa Itoe Tabata Yukari Miura Hiroki Tajiri Yudai Seto Dr. Shinnosuke Horiuchi Prof. Dr. Eri Sakuda Prof. Dr. Keisuke Umakoshi |
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Affiliation: | Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University, Bunkyo-machi 1–14, Nagasaki, 852-8521 Japan |
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Abstract: | Photocatalytic CO2 reduction using a ruthenium photosensitizer, a sacrificial reagent 1,3-dimethyl-2-(o-hydroxyphenyl)-2,3-dihydro-1H-benzo[d]imidazole (BI(OH)H), and a ruthenium catalyst were carried out. The catalysts contain a pincer ligand, 2,6-bis(alkylimidazol-2-ylidene)pyridine (CNC) and a bipyridine (bpy). The photocatalytic reaction system resulted in HCOOH as a main product (selectivity 70–80 %), with a small amount of CO, and H2. Comparative experiments (a coordinated ligand (NCMe vs. CO) and substituents (tBu vs. Me) of the CNC ligand in the catalyst) were performed. The turnover number (TONHCOOH) of carbonyl-ligated catalysts are higher than those of acetonitrile-ligated catalysts, and the carbonyl catalyst with the smaller substituents (Me) reached TONHCOOH=5634 (24 h), which is the best performance among the experiments. |
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Keywords: | carbonyl complexes ligand effect photocatalytic CO2 reduction pincer ligand ruthenium |
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