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OXODIPYRROMETHENES AS REACTIVE SINGLET OXYGEN ACCEPTORS. MEASUREMENT OF THEIR CHEMICAL REACTION RATES BY A LASER FLASH PHOTOLYSIS TECHNIQUE
Author(s) -
Matheson I. B. C.,
Lightner D. A.
Publication year - 1979
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.1751-1097.1979.tb07794.x
Subject(s) - singlet oxygen , flash photolysis , photochemistry , oxygen , quenching (fluorescence) , chemistry , singlet state , photodissociation , laser , singlet fission , triplet state , reaction rate constant , excited state , molecule , fluorescence , atomic physics , kinetics , optics , organic chemistry , physics , quantum mechanics
— Singlet oxygen has been generated directly in 1,1,2‐trichloro, 1,2,2‐trifluoroethane solution by irradiation of the oxygen dimol 2 3 ∑‐ g →2 1 δ g transition with a pulsed dye laser and the 3 ∑ g ‐ → 1 δ g + lv transition with a continuous Nd‐YAG laser. The rates of chemical reaction and physical quenching of singlet oxygen so generated has been measured for a series of substituted oxodipyrro‐methenes. The results show that the oxodipyrromethenes react with singlet oxygen at rates comparable to that for 1,3‐diphenylisobenzofuran. The rate of quenching of singlet oxygen by ground state oxygen has been measured to be 2.5±0.3 × 10 3 M ‐l s ‐1 .