Journal
INORGANIC CHEMISTRY
Volume 52, Issue 9, Pages 5088-5096Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic3028644
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Funding
- Chinese Academy of Sciences
- NSFC [21290194, 51073048]
- ISF
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Mononuclear Ru-based water oxidation catalysts (WOCs) constitute an important class of WOCs for water splitting. This work constitutes a systematic study of Ru-O-2 complexes of mononuclear ruthenium WOCs, with a focus on the thermodynamics of water-assisted O-2 release in various electronic states and conformations. Our extensive DFT study reveals several factors that affect the O-2 release thermodynamics: (1) steric effect from the ligand sphere of Ru; (2) trans effect of ligands trans to O-2; (3) oxygen cis coordinating effect; (4) carbon coordinating effect; and (5) Ru coordination strength. Some of these effects could selectively stabilize/destabilize some states/conformations of the Ru-O-2 complexes relative to Ru-OH2 complexes, and affect thereby the O-2 release thermodynamics. The identification and rationalization of factors for O-2 release thermodynamics, as in this work, could be helpful toward a better understanding of this final step of the ruthenium catalyzed water oxidation.
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