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Chlorophyll, pheophytin and bacteriochlorophyll sensitize a one‐electron transfer in the presence of quinones in ethanol, to produce a ternary complex of ground state porphyrin analog, alcohol cation radical and semiquinone anion radical as the primary photo‐product at low temperature. A similar photo‐oxidation of alcohol to produce a binary complex is caused by direct excitation of quin‐one in the absence of chlorophyll. The mechanisms of these reactions and their implications for photosynthesis are discussed.
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Harbour et al. (1974) studied this question.
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