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PHOTOSENSITIZATION AND COMPLEX FORMATION IN A MODEL SYSTEM: 2‐AMINO‐PYRIMIDINE IN ETHANOL
Author(s) -
NEUBACHER H.,
LENCI F.
Publication year - 1973
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.1751-1097.1973.tb06328.x
Subject(s) - pyrimidine , photochemistry , chemistry , ethanol , phosphorescence , quenching (fluorescence) , absorption (acoustics) , fluorescence , sensitization , excited state , triplet state , radical , molecule , stereochemistry , organic chemistry , materials science , physics , quantum mechanics , nuclear physics , immunology , composite material , biology
— In the presence of 2‐amino‐pyrimidine, ethanol free radicals are produced in rigid glasses at 77°K by light not absorbed by the alcohol. ESR measurements indicate that a photo‐sensitization occurs following a step‐wise biphotonic process via triplet‐triplet absorption. Absorption, fluorescence and phosphorescence measurements show that the photosensitization quenching effect at high sensitizer concentration is correlated with formation of a molecular complex, probably generated from an excited state of 2‐amino‐pyrimidine.