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Issue 12, 2017
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A matrix of heterobimetallic complexes for interrogation of hydrogen evolution reaction electrocatalysts

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Abstract

Experimental and computational studies address key questions in a structure–function analysis of bioinspired electrocatalysts for the HER. Combinations of NiN2S2 or [(NO)Fe]N2S2 as donors to (η5-C5H5)Fe(CO)+ or [Fe(NO)2]+/0 generate a series of four bimetallics, gradually “softened” by increasing nitrosylation, from 0 to 3, by the non-innocent NO ligands. The nitrosylated NiFe complexes are isolated and structurally characterized in two redox levels, demonstrating required features of electrocatalysis. Computational modeling of experimental structures and likely transient intermediates that connect the electrochemical events find roles for electron delocalization by NO, as well as Fe–S bond dissociation that produce a terminal thiolate as pendant base well positioned to facilitate proton uptake and transfer. Dihydrogen formation is via proton/hydride coupling by internal S–H+H–Fe units of the “harder” bimetallic arrangements with more localized electron density, while softer units convert H⋯Hvia reductive elimination from two Fe–H deriving from the highly delocalized, doubly reduced [Fe2(NO)3] derivative. Computational studies also account for the inactivity of a Ni2Fe complex resulting from entanglement of added H+ in a pinched –Sδ⋯H+δS− arrangement.

Graphical abstract: A matrix of heterobimetallic complexes for interrogation of hydrogen evolution reaction electrocatalysts

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Publication details

The article was received on 02 Aug 2017, accepted on 11 Oct 2017 and first published on 12 Oct 2017


Article type: Edge Article
DOI: 10.1039/C7SC03378H
Citation: Chem. Sci., 2017,8, 8291-8300
  • Open access: Creative Commons BY license
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    A matrix of heterobimetallic complexes for interrogation of hydrogen evolution reaction electrocatalysts

    P. Ghosh, S. Ding, R. B. Chupik, M. Quiroz, C. Hsieh, N. Bhuvanesh, M. B. Hall and M. Y. Darensbourg, Chem. Sci., 2017, 8, 8291
    DOI: 10.1039/C7SC03378H

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