DFT analysis into the intermediates of nickel pyridinethiolate catalysed proton reduction

Nickel pyridine 2-thiolate (Ni(PyS)3(-)) has shown good stability and activity as a H2 generation catalyst for use in solar energy storage. The experimentally proposed catalytic pathway is explored using DFT calculations. Free energy changes along the reaction coordinate, spin states, localization o...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2015-08, Vol.44 (32), p.14333-14340
Main Authors: Virca, Carolyn N, McCormick, Theresa M
Format: Article
Language:English
Subjects:
Catalysts
Charge
Mathematical models
Nickel
Position (location)
Pyridines
Reduction
Solvation
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Summary:Nickel pyridine 2-thiolate (Ni(PyS)3(-)) has shown good stability and activity as a H2 generation catalyst for use in solar energy storage. The experimentally proposed catalytic pathway is explored using DFT calculations. Free energy changes along the reaction coordinate, spin states, localization of charge and geometry of the intermediates were explored. Calculations were performed using Gaussian 09 with a B3P86/6-31+G(d) basis set and a CPCM water solvation model. Of particular interest were our findings that the first reduction occurs at the nickel rather than through non-innocent ligands and that water coordination is not favourable although protonation of the pyridyl nitrogen causes dechelation. Sequential and concerted proton coupled electron transfer were considered in the formation of the hydride.
ISSN:1477-9226
1477-9234
DOI:10.1039/c5dt02044a