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The mechanism of Ce(IV) water oxidation catalyzed by Ru(tpy)(bpm)(OH(2))(2+) (tpy = 2,2':6',2''-terpyridine; bpm = 2,2'-bipyrimidine) and related single-site catalysts has been determined by a combination of mixing and stopped-flow experiments with spectrophotometric monitoring. The mechanism features O---O coupling by water attack on Ru(V)=O(3+) and three peroxidic intermediates that have been characterized by a combination of spectroscopy and DFT calculations.
Concepcion et al. (Tue,) studied this question.
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