Abstract
Summary Rate constants have been determined for the reduction of ferricytochrome- c by free radicals. k values for pyridinyl radicals, benzoate adduct radicals, nitrobenzene and nitrobenzoate anion radicals, α-hydroxy radicals, formyl anion radical, and superoxide radical show no apparent correlation with size, charge, or structure of the reductant. Some k values change as the pH is increased. The methyl viologen radical is the most reactive; NAD· is reactive; the pentaerythritol radical is unreactive at pH=7 but moderately reactive at pH=9; and O2 becomes less reactive with increasing pH. The results indicate that several mechanisms for electron transfer are operative and that conformers of differing reactivity influence the kinetics in alkaline solutions.
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