Organometallic Iridium(III) Complex Sensitized Ternary Hybrid Photocatalyst for CO to CO Conversion.

Author(s) Kim, P.Soo; Choi, S.; Kim, S.Y.; Jo, J.Hyoung; Lee, Y.Seo; Kim, B.; Kim, W.; Choi, W.; Kim, C.Hoon; Son, H.J.; Pac, C.; Kang, S.Ook
Journal Chemistry
Date Published 2019 Oct 22

A series of heteroleptic iridium(III) complexes functionalized with two phosphonic acid (-PO H ) groups ( IrP, IrP, IrP, and IrP) were prepared and anchored onto rhenium(I) catalyst (ReP)-loaded TiO particles (TiO /ReP) to build up a new IrP-sensitized TiO photocatalyst system (IrP/TiO /ReP). The photosensitizing behavior of the IrP series was examined within the IrP/TiO /ReP platform for the photocatalytic conversion of CO into CO. The four IrP-based ternary hybrids showed increased conversion activity and durability than that of the corresponding homo- (IrP+ReP) and heterogeneous (IrP+TiO /ReP) mixed systems. Among the four IrP/TiO /ReP photocatalysts, the low-energy-light (>500 nm) activated IrP immobilized ternary system ( IrP/TiO /ReP) exhibited the most durable conversion activity, giving a turnover number of ≥730 for 170 h. A similar kinetic feature observed through time-resolved photoluminescence measurements of both IrP/TiO and TiO -free IrP films suggests that the net electron flow in the ternary hybrid proceeds dominantly through a reductive quenching mechanism, unlike the oxidative quenching route of typical dye/TiO -based photolysis.

DOI 10.1002/chem.201903136
ISSN 1521-3765
Citation Chemistry. 2019;25(59):1360913623.

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