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REVERSIBLE LIGHT‐TNDUCED SINGLE ELECTRON TRANSFER REACTIONS BETWEEN CHLOROPHYLL AND HYDROQUINONE IN SOLUTION *
Author(s) -
Banerjee A. K.,
Tollin Gordon
Publication year - 1966
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.1751-1097.1966.tb05800.x
Subject(s) - hydroquinone , chemistry , photochemistry , pheophytin , oxidizing agent , electron transfer , chlorophyll , excited state , light harvesting complexes of green plants , pyridine , quinone , photosynthesis , organic chemistry , photosystem ii , biochemistry , physics , photosystem , nuclear physics
— EPR and optical studies demonstrate the occurrence of reversible temperature‐independent light‐induced single electron transfer reactions between chlorophyll (and pheophytin) and hydroquinone in degassed ethanol solutions. Oxygen is shown to quench this process, presumably by interacting with chlorophyll excited states. Pyridine and isoquino‐line increase the effectiveness of the hydroquinone as an electron donor to chlorophyll, probably by acting as bases to form hydroquinone anions (or perhaps ion‐pairs) which are more easily oxidized. Hydroquinone is found to be more effective in electron transfer than is benzoquinone, suggesting that the chlorophyll excited state is a better oxidizing agent than it is a reducing agent.