Triplet state quenching by photoinduced radicals in the sensitized ethanol photolysis.
UV irradiation of a rigid solution of 2-amino-pyrimidine in ethanol at 77 degrees K results in a sensitized production of ethyl radicals. The radicals are formed via a biphotonic process. The increase of the radical yield with irradiation time is directly correlated to a decrease of the number of triplet state molecules as detected by ESR. A kinetic model of the biphotonic process is presented and verified by experimental results. It supports the hypothesis of a catalytically enhanced radiationless decay process of the triplet states due to an interaction between the radicals and the triplet state molecules.
D004735:Energy Transfer; D000431:Ethanol / Q000528:radiation effects*; D005609:Free Radicals; D007700:Kinetics; D010782:Photolysis; D011743:Pyrimidines; D011830:Radiation Effects; D014466:Ultraviolet Rays
D005609:Free Radicals; D011743:Pyrimidines; D000431:Ethanol