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A High-Valent Metal-Oxo Species Produced by Photoinduced One-Electron, Two-Proton Transfer Reactivity.
Inorganic Chemistry 2018 January 3
Described herein is a photochemical approach to the generation of a high-valent metal-oxo species that utilizes a chromophore or "sensitizer", a semiconducting electron acceptor, and a redox buffer that poises a catalyst's initial protonation and oxidation state. The photoexcited sensitizer injects an electron into the semiconductor and then oxidizes the catalyst whose reactivity occurs in kinetic competition with back electron transfer. Core-shell SnO2 /TiO2 semiconductor nanocrystallites inhibited charge recombination relative to TiO2 acceptors. With low sensitizer-catalyst surface coverages, a novel trapping process is exploited that enables catalysis reactivity to be quantified on time scales ranging from nanoseconds to minutes. A proof-of-principle example provides the demonstration of a light-initiated, (1e- , 2H+ )-transfer reaction, with an inverse isotope effect of kH /kD = 0.63, to generate a Ru(IV) oxo species.
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