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THE PHOTOPEROXIDATION OF UNSATURATED ORGANIC MOLECULES—XV. O 2 1δg QUENCHING BY BILIRUBIN AND BILIVERDIN
Author(s) -
Stevens B.,
Small R. D.
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.tb06767.x
Subject(s) - biliverdin , chemistry , rubrene , reaction rate constant , quenching (fluorescence) , electron transfer , electron acceptor , bilirubin , acceptor , molecule , medicinal chemistry , photochemistry , stereochemistry , kinetics , fluorescence , heme , organic chemistry , medicine , physics , heme oxygenase , quantum mechanics , gastroenterology , enzyme , condensed matter physics
—The use of competitive methods with rubrene as reference acceptor provides values of the rate constants k B Q = 2.3 times 10 9 / mol ‐1 s ‐1 and k v q = 3.3 times 10 9 mol ‐1 s ‐1 for the physical quenching of O 2 1 δg, by bilirubin (in CCl 4 ) and biliverdin (in CHCl 3 ) respectively attributed to electron and energy transfer processes. The rate constant k B R = 1.7 times 10 8 / mol ‐1 s ‐1 for bilirubin reaction with O 2 1 δg is considerably greater than that k v R 3 times 10 8 mol ‐ s ‐1 for the reaction of biliverdin which has identical O 2 1 δa, acceptor sites, and is attributed to a primary Type I oxidation process followed by a slower Type II addition of O 2 1 δg to the primary products.