Role of Proton-Coupled Electron Transfer in the Redox Interconversion between Benzoquinone and Hydroquinone
Journal of the American Chemical Society2012Vol. 134(45), pp. 18538–18541
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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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