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J Am Chem Soc. 2012 Nov 14;134(45):18538-41. doi: 10.1021/ja308700t. Epub 2012 Nov 5.

Role of proton-coupled electron transfer in the redox interconversion between benzoquinone and hydroquinone.

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  • 1Department of Chemistry, University of North Carolina at Chapel Hill, 27599-3290, United States.

Abstract

Benzoquinone/hydroquinone redox interconversion by the reversible Os(dmb)(3)(3+/2+) couple over an extended pH range with added acids and bases has revealed the existence of seven discrete pathways. Application of spectrophotometric monitoring with stopped-flow mixing has been used to explore the role of PCET. The results have revealed a role for phosphoric acid and acetate as proton donor and acceptor in the concerted electron-proton transfer reduction of benzoquinone and oxidation of hydroquinone, respectively.

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