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A cyclometalated iridium(III) complex having 2-(pyren-1-yl)-4-methylquinoline ligands [ Ir(pyr) ] has a strong absorption band in the visible region (ε 444nm  = 67,000 M −1  cm −1 ) but does not act as a photosensitizer for photochemical reduction reactions in the presence of triethylamine as an electron donor. Here, 1,3-dimethyl-2-(o-hydroxyphenyl)-2,3-dihydro-1H-benzo[d]imidazole (BI(OH)H) was used instead of the amine, demonstrating that BI(OH)H efficiently quenched the excited state of  Ir(pyr)  and can undergo the photochemical carbon dioxide (CO 2 ) reduction catalyzed by  trans (Cl)-Ru(dmb)(CO) 2 Cl 2  (dmb = 4,4′-dimethyl-2,2′-bipyridine,  Ru ) to produce formate as the main product. We also synthesized a binuclear complex combining  Ir(pyr)  and  Ru   via  an ethylene bridge and investigated its photochemical CO 2  reduction activity in the presence of BI(OH)H.

An Ir(III) Complex Photosensitizer With Strong Visible Light Absorption for Photocatalytic CO2 Reduction