Abstract
The effect of medium acidity on the mechanism of the electrochemical reduction of pheophytin at the mercury dropping electrode has been studied. The rate of anion-radical protonation is shown to be comparable with the rate of electron transfer. It leads to an experimentally observed complex dependence of E 1 2 on pH. The products of pheophytin reduction as well as their oxidation potentials have been identified. On the basis of the data obtained, a possible mechanism of pheophytin participation in the functioning of photosystem II is discussed.
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