Proton-Coupled Electron Transfer Reduction of a Quinone by an Oxide-Bound Riboflavin Derivative Article

Song, N, Dares, CJ, Sheridan, MV et al. (2016). Proton-Coupled Electron Transfer Reduction of a Quinone by an Oxide-Bound Riboflavin Derivative . JOURNAL OF PHYSICAL CHEMISTRY C, 120(42), 23984-23988. 10.1021/acs.jpcc.6b08176

cited authors

  • Song, N; Dares, CJ; Sheridan, MV; Meyer, TJ

abstract

  • The redox properties of a surface-bound phosphate flavin derivative (flavin mononucleotide, FMN) have been investigated on planar-FTO and nanoITO electrodes under acidic conditions in 1:1 CH3CN/H2O (V:V). On FTO, reversible 2e-/2H+ reduction of FTO|-FMN to FTO|-FMNH2 occurs with the pH and scan rate dependence expected for a 2e-/2H+ surface-bound couple. The addition of tetramethylbenzoquinone (Me4Q) results in rapid electrocatalyzed reduction to the hydroquinone by a pathway first order in quinone and first order in acid with kH = (2.6 ± 0.2) × 106 M-1 s-1. Electrocatalytic reduction of the quinone also occurs on derivatized, high surface area nanoITO electrodes with evidence for competitive rate-limiting diffusion of the quinone into the mesoporous nanostructure.

publication date

  • October 27, 2016

published in

Digital Object Identifier (DOI)

start page

  • 23984

end page

  • 23988

volume

  • 120

issue

  • 42