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TRIPLET LIFETIMES OF SOME FLAVINS
Author(s) -
Fritz B. J.,
Matsui K.,
Kasai S.,
Yoshimura A.
Publication year - 1987
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.1751-1097.1987.tb05415.x
Subject(s) - flash photolysis , flavin group , reaction rate constant , photochemistry , chemistry , quenching (fluorescence) , triplet state , ground state , molecule , kinetics , fluorescence , atomic physics , physics , organic chemistry , optics , quantum mechanics , enzyme
— Using flash photolysis the rate constants of the triplet decay at pH 7.0 (26°C) of 10‐hydroxyethyl‐isoalloxazine (2700 s −1 ), 2′‐deoxyRF (2300 s −1 ), 5′‐deoxyRF (3200 s −1 ), 8‐hydroxyRF (18 000 s −1 ) and 8‐aminoRF (28 000 s −1 ) have been measured. The results agree with other evidence that photochemical properties of flavins are influenced by the interaction of the sidechain with the isoalloxazine nucleus. In addition, our data on RF and FMN indicate that the triplet decay rates given in the literature for these compounds have to be corrected to 3200 s −1 (RF) and 4900 s −1 (FMN), respectively. The rate constants for the quenching of the triplet by ground state molecules for all above compounds are given.