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DETERMINATION OF SINGLET OXYGEN RATE CONSTANTS IN AQUEOUS SOLUTIONS
Author(s) -
Kraljić I.,
Sharpatyi V. A.
Publication year - 1978
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.1751-1097.1978.tb06973.x
Subject(s) - singlet oxygen , aqueous solution , chemistry , oxygen , reaction rate constant , quenching (fluorescence) , photochemistry , substrate (aquarium) , ion , inorganic chemistry , analytical chemistry (journal) , kinetics , fluorescence , organic chemistry , physics , oceanography , quantum mechanics , geology
— A very efficient quenching of singlet oxygen ( 1 O 2 ) by N 3 ‐ ions has been applied to the determination of rate constants of reactions of 1 O 2 with various substrates (A). This determination has been made possible by choosing experimental conditions which give simple competition between N 3 ‐ and A for 1 O 2 formed in the steady state irradiation of convenient sensitizing dye (S). The consumption of oxygen by the substrate, as followed with an oxygen analyzer, decreases in the presence of low concentrations of N 3 ‐ . Using neutral air saturated aqueous solutions containing the dye phenosafranine + A and varying concentrations of N 3 ‐ , the 1 O 2 rate constants for reactions with biological substrates and some radiation protective agents have been determined.