2012•Journal of the American Chemical SocietyRequires access

Role of Proton-Coupled Electron Transfer in the Redox Interconversion between Benzoquinone and Hydroquinone

Na Song, Christopher J. Gagliardi, Robert A. Binstead, Ming‐Tian Zhang, H. Holden Thorp, Thomas J. Meyer

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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Key concepts: Chemistry, Hydroquinone, Redox, Benzoquinone, Proton, Proton-coupled electron transfer, Electron transfer, Electron acceptor