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- W2756042010 abstract "A series of cationic Ir(III) complexes ([Ir(btp)2(bpy-X2)]+ (Ir-X+: btp = (2-pyridyl)benzo[b]thiophen-3-yl; bpy-X2 = 4,4′-X2-2,2′-bipyridine (X = OMe, tBu, Me, H, and CN)) were applied as visible-light photosensitizer to the CO2 reduction to CO using a hybrid catalyst (TiO2/ReP) prepared by anchoring of Re(4,4′-Y2-bpy)(CO)3Cl (ReP; Y = CH2PO(OH)2) on TiO2 particles. Irradiation of a solution containing Ir-X+, TiO2/ReP particles, and an electron donor (1,3-dimethyl-2-phenyl-1,3-dihydrobenzimidazole) in N,N-dimethylformamide at greater than 400 nm resulted in the reduction of CO2 to CO with efficiencies in the order X = OMe > tBu ≈ Me > H; Ir-CN+ has no photosensitization effect. A notable observation is that Ir-tBu+ and Ir-Me+ are less efficient than Ir-OMe+ at an early stage of the reaction but reveal persistent photosensitization behavior for a much longer period of time unlike the latter. Comparable experiments showed that (1) the Ir-X+ sensitizers are commonly superior compared to Ru(bpy)32+, a widely used transition-metal photosensitizer, and (2) the system comprising Ir-OMe+ and TiO2/ReP is much more efficient than a homogeneous-solution system using Ir-OMe+ and Re(4,4′-Y′2-bpy)(CO)3Cl (Y′ = CH2PO(OEt)2). Implications of the present observations involving reaction mechanisms associated with the different behavior of the photosensitizers are discussed in detail." @default.
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- W2756042010 date "2017-09-13" @default.
- W2756042010 modified "2023-10-16" @default.
- W2756042010 title "Photosensitization Behavior of Ir(III) Complexes in Selective Reduction of CO<sub>2</sub> by Re(I)-Complex-Anchored TiO<sub>2</sub> Hybrid Catalyst" @default.
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- W2756042010 doi "https://doi.org/10.1021/acs.inorgchem.7b01963" @default.
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