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CHLOROPHYLL ONE‐ELECTRON PHOTOCHEMISTRY‐II. PHOTOSENSITIZATION BY CHLOROPHYLL, PHEOPHYTIN AND BACTERIOCHLOROPHYLL OF A ONE‐ELECTRON TRANSFER REACTION BETWEEN ETHANOL AND QUINONE *
Author(s) -
Harbour John R.,
Tollin Gordon
Publication year - 1974
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1974.tb06491.x
Subject(s) - pheophytin , photochemistry , chemistry , bacteriochlorophyll , chlorophyll , electron transfer , light harvesting complexes of green plants , chlorophyll a , ethanol , quinone , photosynthesis , stereochemistry , organic chemistry , biochemistry , photosystem ii , photosystem
— 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.