Abstract: Phosphorescence lifetimes are reported for n-alkyl esters of benzophenone-4- carboxylic acid, as a function of chain length, for dilute room-temperature solutions in carbon tetrachloride, 1, 1, 2-trichlorotrifluoroethane (Freon 1 13), and acetic acid. From these, rate constants, k,,,, are obtained for intramolecular emission quenching. Rate constants, k2, are also ob-tained for bimolecular quenching by hexane in each solvent. Comparison of k,,,/k2 ...
