Abstract

THE KINETICS of photochemical reactions of quinones in alcoholic solutions has been a subject of considerable interest in past years[l]. In these'studies, the photolysis of quinones has been shown by optical methods to yield two different short-lived radical intermediates, the semiquinone radical anion (Q;) and the monoprotonated neutral semiquinone radical (QH.). The relative concentrations of these two radicals are strongly pH dependent, presumably due to the equilibrium Q H . * Q T + H +

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