Download Biological Electrochemistry by Glenn Dryhurst (Auth.) PDF

By Glenn Dryhurst (Auth.)

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Thus, two reduction peaks (peaks l c and ll c) were observed, and on the reverse sweep, two electrooxidation peaks (peaks ll a and l a). In the absence of any added proton donor, peaks l c and l a had a peak potential separation (Δ£ ρ) of 60 mV, the value expected for a l e " reversible electrode reaction. Doublepotential-step chronoamperometric data indicated that reduction peaks l c and ll c both represented 1 e~ processes. Thus, in the absence of added proton donor, the peak l c process of ubiquinone-5 [Q, Eq.

24. 1 M tetraethylammonium perchlorate. Sweep rate: 120 mV s" . (From Eggins and Chambers [71], reprinted by permission of the publisher. ) 35 IV. 0 Potential (Vvs. SCE) Fig. 25. 91 m M H C I 0 4 . Sweep 1 rate: 120 mV s" . (From Eggins and Chambers [71], reprinted by permission of the publisher. ) reduction of protonated p-benzoquinone to give p-benzohydroquinone. Thus, overall, the peak l c process followed the Parker [68] scheme (see Fig. 21 ). Peak l c was shown to involve the reduction of quinone-proton mixtures by observing the effects of proton donors on the cyclic voltammetry of various quinones.

Cyclic voltammetry of p-benzohydroquinone in acetonitrile in the absence of acidic or basic additives paralleled those reported previously by Eggins and Chambers [71]. However, it was found that the magnitude of the 42 1 . Quinones Potential (Vvs. SCE) Fig. 29. 0 m M perchlorate acid, and 2,6-lutidine. 0 m M . Sweep rate: 156 mV s" . ) sweep rate required in order to observe reduction peak lll c was greatly dependent on the nature of the electrolyte used and the surface conditions of the electrode.

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