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Issue 4, 2012
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Formate oxidationvia β-deprotonation in [Ni(PR2NR′2)2(CH3CN)]2+ complexes

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Recent studies from our laboratories have shown that the [Ni(PR2NR′2)2(CH3CN)]2+ complexes originally developed as artificial hydrogenases are also active electrocatalysts for formate oxidation (TOF ∼16 s−1). The focus of the current work is to develop a detailed understanding of the catalytic mechanism, which would aid in the design of improved catalysts for the interconversion of CO2 and formate. Based on electrochemical and spectroscopic experiments, including data for a new [Ni(PCy2NPhOMe2)2(CH3CN)]2+ complex, we propose a mechanism in which the rate-determining step is a proton transfer from the Ni–O2CH β-H to the ligand pendant base coupled with a 2e transfer to Ni(II), circumventing direct hydride transfer to the metal.

Graphical abstract: Formate oxidation via β-deprotonation in [Ni(PR2NR′2)2(CH3CN)]2+ complexes

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The article was received on 30 Nov 2011, accepted on 17 Jan 2012 and first published on 16 Feb 2012

Article type: Paper
DOI: 10.1039/C2EE03341K
Energy Environ. Sci., 2012,5, 6480-6490

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    Formate oxidation via β-deprotonation in [Ni(PR2NR′2)2(CH3CN)]2+ complexes

    C. S. Seu, A. M. Appel, M. D. Doud, D. L. DuBois and C. P. Kubiak, Energy Environ. Sci., 2012, 5, 6480
    DOI: 10.1039/C2EE03341K

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