Abstract— 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.

2amino-pyrimidine in ethanol produces free radicals and a molecular complex, likely generated from an excited state of 2amino-pyrimidine, quenches photosensitization at high concentrations.

Paper

PHOTOSENSITIZATION AND COMPLEX FORMATION IN A MODEL SYSTEM: 2‐AMINO‐PYRIMIDINE IN ETHANOL

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