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ELECTRON TRANSFER FROM PHOTOEXCITED SINGLET AND TRIPLET BACTERIOPHEOPHYTIN
Author(s) -
Holten Dewey,
Gouterman Martin,
Parson William W.,
Windsor Maurice W.,
Rockley Mark G.
Publication year - 1976
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.1751-1097.1976.tb07275.x
Subject(s) - intersystem crossing , chemistry , singlet state , photochemistry , picosecond , excited state , electron transfer , quenching (fluorescence) , triplet state , singlet fission , nanosecond , benzoquinone , quantum yield , fluorescence , atomic physics , molecule , laser , physics , organic chemistry , quantum mechanics , optics , biochemistry
— Nanosecond and picosecond. kinetic techniques have been used to study electron transfer from the first excited singlet state (Bph*) and the first excited triplet state (Bph T ) of bacteriopheophytin to p ‐benzoquinone. Quenching of the first excited singlet state by 40 m M p ‐benzoquinone results in a decrease in the lifetime of Bph* but does not lead directly to the formation of the π‐cation radical (Bph†). In the presence of 8 M methyl iodide and 40 m M p ‐benzoquinone together, the singlet lifetime is reduced further; however, the quantum yield of Bph T is enhanced due to the increased rate of intersystem crossing between Bph* and Bph T . Electron transfer from Bph T to p ‐benzoquinone leads to the formation and detection of Bph†. The results are discussed in terms of the spin‐selectivity of the reverse electron transfer process within the intermediate charge transfer complexes.