Journal
CHEMSUSCHEM
Volume 8, Issue 21, Pages 3688-3696Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201500798
Keywords
complexes; photosensitizer; redox chemistry; ruthenium; water oxidation
Funding
- DFG [Me 1313/9-1]
- ICIQ-IPMP Marie Curie COFUND Project [291787ICIQ-IPMP]
- PhD program Catalysis for Sustainable Synthesis (CaSuS)
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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 pH7, and a turnover frequency of up to 11.1s(-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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