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ON THE PRODUCTION OF NITROXIDE RADICALS BY SINGLET OXYGEN REACTION: AN EPR STUDY
Author(s) -
Lion Y.,
Gandin E.,
Vorst A.
Publication year - 1980
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.1751-1097.1980.tb02545.x
Subject(s) - electron paramagnetic resonance , chemistry , singlet oxygen , photochemistry , dabco , radical , nitroxide mediated radical polymerization , reaction rate constant , quenching (fluorescence) , amine gas treating , steric effects , singlet state , oxygen , kinetics , organic chemistry , catalysis , polymerization , nuclear magnetic resonance , radical polymerization , excited state , fluorescence , physics , polymer , quantum mechanics , nuclear physics
— The production of free radicals by reaction of 2,2,6,6‐tetramethyl‐4‐piperidinol with singlet oxygen was studied by EPR spectroscopy. The rate constant of the amine was found to be equal to 8 ×10 5 M ‐1 s ‐1 in ethanol and to 4 × 10 7 M ‐1 s ‐1 in phosphate buffer (pH 8). Competition experiments were performed with singlet oxygen quenchers such as NaN 3 , DABCO and the quenching rate constants were found to be consistent with the literature values. The EPR method proved to be a valuable technique to study the reaction of singlet O 2 with the sterically hindered amine without any interfering effect.