title: Role of proton-coupled electron transfer in the redox interconversion between benzoquinone and hydroquinone.
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.
authors.affiliation: Department of Chemistry, University of North Carolina at Chapel Hill, 27599-3290, United States.
authors.forename: Na
authors.initials: N
authors.lastname: Song
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Gagliardi
authors.forename: Robert A
authors.initials: RA
authors.lastname: Binstead
authors.forename: Ming-Tian
authors.initials: MT
authors.lastname: Zhang
authors.forename: Holden
authors.initials: H
authors.lastname: Thorp
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Meyer
mesh_terms: D016227:Benzoquinones / Q000737:chemistry*; D004579:Electron Transport; D006873:Hydroquinones / Q000737:chemistry*; D010084:Oxidation-Reduction; D011522:Protons
chemical_list: D016227:Benzoquinones; D006873:Hydroquinones; D011522:Protons; C004532:quinone; C031927:hydroquinone