RATE FOR PHOTODIMERIZATION OF ETHYL CINNAMATE IN DILUTE SOLUTION

Abstract
Kinetic parameters for photodimerization of ethyl cinnamate were determined in dilute ethanol solution (3∼5×10−5M) where the spontaneous deactivations of excited states proceed much faster than their bimolecular reactions. The quantum yield of cyclodimer formation from excited singlet state, ΦDM′/[C]0 ≅ τMκDM, and that from excited triplet state, ΦISCφDT′/[C]0 ≅ ΦISCτTκDT, are 15 M−1 and 13 M−1, respectively, in ethanol at 30 °C.