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QUENCHING OF SINGLET OXYGEN BY SENSITIZER IN DYE‐SENSITIZED PHOTOOXYGENATION *
Author(s) -
Tanielian Charles,
Golder Lucien
Publication year - 1981
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.1751-1097.1981.tb09017.x
Subject(s) - photooxygenation , singlet oxygen , quenching (fluorescence) , rose bengal , photochemistry , chemistry , benzene , methanol , oxygen , singlet state , fluorescence , excited state , organic chemistry , physics , optics , atomic physics
— A general method for the determination of the extent of the singlet oxygen ( 1 O 2 ) quenching by sensitizer in the dye‐sensitized photooxygenation of olefins is used in the case of rose bengal (RB) in methanol and oil‐soluble chlorophyll (M) in benzene with 2‐methyl‐2‐pentene and tetramethylethylene as acceptors. Unlike RB, M which contains only a low percentage of pure chlorophyll (Chi), quenches 1 O 2 . It is shown that this very cheap mixture can be used for kinetic studies and that the chemical quenching of 1 O 2 by M is very weak with respect to the physical quenching. The upper limit for the rate constants of physical and chemical quenching of 1 O 2 by Chi is estimated.