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PHOTOINDUCED ONE‐ELECTRON TRANSFER BETWEEN BACTERIOCHLOROPHYLL AND QUINONE IN ACETONE *
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.tb06492.x
Subject(s) - quinone , bacteriochlorophyll , photochemistry , chemistry , electron transfer , benzoquinone , acetone , photosynthetic reaction centre , spectroscopy , radical ion , ion , stereochemistry , organic chemistry , pigment , physics , quantum mechanics
— Illumination with red light of a degassed solution of bacteriochlorophyll and benzoquinone or ubiquinone in dry acetone at low temperatures (< ‐ 105°C) leads to the formation of the bacteriochlorophyll cation radical and the quinone anion radical, as detected by ESR spectroscopy. At temperatures around ‐ 110°C, the quinone radical signal corresponds to an emission of microwave radiation. These results are interpreted in terms of a one‐electron transfer from a spin‐polarized bacteriochlorophyll triplet state to the quinone, producing an anion radical which is predominantly in the upper spin state.