The simultaneous measurement of donor quenching and acceptor sensitization of a triplet-energy-transfer system as studied by phosphorescence techniques is presented. The quenching constant (KQ = 900±90 liter mole−1) is found to be different than the sensitization constant (KS = 390±40 liter mole−1). A general mechanism is proposed which accounts for these results, and also for cases where KS = KQ. Arguments are presented for the reevaluation of the triplet energies of benzil and anisil, and the newly appraised values are ET (benzil) = 19 000 cm−1 and ET (anisil) = 19 300 cm−1.
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Richtol et al. (1966) studied this question.
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