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EXCITED‐STATE REACTIONS OF OXIDIZED FLAVIN DERIVATIVES
Author(s) -
Lasser Nehama,
Feitelson Jehuda
Publication year - 1975
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.1751-1097.1975.tb06664.x
Subject(s) - flash photolysis , protonation , chemistry , photochemistry , flavin group , triplet state , singlet oxygen , singlet fission , flavin mononucleotide , singlet state , excited state , ground state , ion , molecule , reaction rate constant , oxygen , kinetics , organic chemistry , atomic physics , physics , enzyme , quantum mechanics
— The reactivity of flavin mononucleotide and of lumiflavin triplets was studied by flash and laser photolysis. The rate constants of the triplets with oxygen, with flavin ground‐state molecules, and with Br ‐ ions were determined. Although in solution at room temperature, the protonated flavin triplet, 3 F1H + , is not formed directly from its very short lived singlet state, a transient, which we think is this triplet, results from protonation of the neutral triplet. This conclusion is based on a comparison between the neutral and the protonated triplet spectra in a low‐temperature glass. It is proposed that the protonated triplet can also be formed by sensitization via the phenanthrene triplet.