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TRIPLET STATE STUDIES OF FLAVlNS BY ELECTRON PARAMAGNETTC RESONANCE‐III
Author(s) -
Shiga T.,
Piette L. H.
Publication year - 1965
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.1751-1097.1965.tb07919.x
Subject(s) - triplet state , intersystem crossing , flavin group , chemistry , photochemistry , excited state , singlet fission , electron paramagnetic resonance , singlet state , quenching (fluorescence) , singlet oxygen , flavin adenine dinucleotide , resonance (particle physics) , oxygen , fluorescence , molecule , nuclear magnetic resonance , atomic physics , cofactor , physics , biochemistry , enzyme , organic chemistry , quantum mechanics
— A continuation of studies is presented on the excited triplet state of flavins using EPR techniques. Detailed experiments are reported on the triplet state of flavin‐mono‐nucleotide (FMN) and flavin‐adenine‐dinucleotide (FAD). Action spectra of triplet yield are explained in terms of the optical absorption for FMN and FAD. Effects of light saturation, concentration quenching and oxygen on the triplet state are discussed. It is suggested that the rate constant k 3 for the intersystem crossover from the excited singlet to the triplet state is increased by oxygen and quenchers such as KI. Detailed kinetic studies are presented on the formation of the triplet state.