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LASER PHOTOLYSIS STUDY OF TRIPLET EOSIN AND THIONINE REACTIONS IN PHOTOSENSITIZED OXIDATIONS
Author(s) -
Kraljić I.,
Lindqvist L.
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.tb06587.x
Subject(s) - thionine , chemistry , photochemistry , eosin , quenching (fluorescence) , singlet oxygen , flash photolysis , eosin y , photodissociation , triplet state , reaction rate constant , tryptophan , thiourea , fluorescence , kinetics , oxygen , organic chemistry , amino acid , catalysis , staining , pathology , biochemistry , quantum mechanics , photocatalysis , electrochemistry , medicine , physics , electrode , molecule
—Nanosecond laser photolysis was used to determine the rate constants of quenching (including chemical reactions) of the triplet states of eosin and thionine, at pH 7, by imidazole, l‐histidine, l‐methionine, l‐phenylalanine, l‐tryptophan, 3‐indole‐acetic acid, cytidine, guanosine, α‐chymotrypsin, lysozyme, allylthiourea, thiourea, p ‐nitrosodimethylaniline, I ‐ N 3 ‐ and Fe(CN) 6 4‐ . The quenching rate constants for thionine were found to be up to three orders of magnitude higher than those for eosin. The mechanism of photosensitized oxygenations (free radical vs singlet oxygen) is discussed on the basis of the present results.