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  • Title: Efficient Light-Driven Water Oxidation Catalysis by Dinuclear Ruthenium Complexes.
    Author: Berardi S, Francàs L, Neudeck S, Maji S, Benet-Buchholz J, Meyer F, Llobet A.
    Journal: ChemSusChem; 2015 Nov; 8(21):3688-96. PubMed ID: 26423045.
    Abstract:
    Mastering the light-induced four-electron oxidation of water to molecular oxygen is a key step towards the achievement of overall water splitting to produce alternative solar fuels. In this work, we report two rugged molecular pyrazolate-based diruthenium complexes that efficiently catalyze visible-light-driven water oxidation. These complexes were fully characterized both in the solid state (by X-ray diffraction analysis) and in solution (spectroscopically and electrochemically). Benchmark performances for homogeneous oxygen production have been obtained for both catalysts in the presence of a photosensitizer and a sacrificial electron acceptor at pH 7, and a turnover frequency of up to 11.1 s(-1) and a turnover number of 5300 were obtained after three successive catalytic runs. Under the same experimental conditions with the same setup, the pyrazolate-based diruthenium complexes outperform other well-known water oxidation catalysts owing to both electrochemical and mechanistic aspects.
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