By Glenn Dryhurst (Auth.)
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Beginning in 1969, a series of reports by Chambers, Eggins and Parker, and others appeared, and not only indicated the complexity of the electron-transfer reactions of quinones in aprotic solvents in the presence of added protons but also provided some very valuable insights into the latter reactions. Eggins and Chambers  in 1969 studied the electrochemical oxidation of hydroquinones in acetonitrile at platinum electrodes. A cyclic voltammogram of p-benzohydroquinone in acetonitrile at a platinum electrode is shown in Fig.
The same peak numbering system is employed as for earlier voltammograms. Addition of the base 2,6-lutidine causes the appearance of a new oxidation peak (peak lll a). The exact location of this peak was dependent on the concentration of 2,6-lutidine [see Figs. 28(b)-(f)] and, in accord with earlier work, peak lll a was proposed to be due to electrooxidation of the monoanion of p-benzohydroquinone (see Fig. 26). The reduction peak l c was assigned to reduction of a monoprotonated benzoquinone (see Fig.
Although the number of electrons involved in the electrode reaction was not determined experimentally, it was assumed to be 2. 7 the electrode reac2 + + tion was a 2e~,2H process and at higher pH values a 2e~,1H process. In the absence of more fundamental electrochemical information, these conclusions must be regarded as very tentative. 04 x 1 0 " 2 1 c m s~ . ^ 100 UJ X Z . «0 I Ô 1 φ 50 0 -50 o °- -100 4 5 6 7 8 9 PH Fig. 32. Variation of £ 1 /2 for the polarographic wave of ubiquinone-50 with pH in (A) 80% 2 ethanolic solution and (B) aqueous solution containing 4 x 1 0 " M dodecyl sulfate.
Biological Electrochemistry by Glenn Dryhurst (Auth.)