期刊
DALTON TRANSACTIONS
卷 40, 期 15, 页码 3859-3870出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0dt01362e
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资金
- EPSRC [EP/G002789]
- EPSRC [EP/G002789/1, EP/J003921/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J003921/1, EP/G002789/1] Funding Source: researchfish
Density functional theory is used to explore possible mechanisms that lead to water oxidation by a bimetallic manganese catalyst developed by McKenzie and co-workers. On the basis of our calculations we propose that the key active intermediate is a mixed valent Mn(III)(mu-O) Mn(IV)-O-center dot oxyl radical species, the oxyl centre being the site of nucleophilic attack by water. The mixed-valent species is in equilibrium with an isomeric diamond-core Mn(IV)(mu-O)(2)Mn(IV) structure, which acts as reservoir for the active species. The chemistry appears to be unique to pentadentate ligands because these shift the position of the equilibrium between the Mn(III)(mu-O)Mn(IV)-O-center dot and Mn(IV)(mu-O)(2)Mn(IV) isomers, such that significant concentrations of the former are present in solution.
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