Abstract
A time-resolved EPR (TREPR) study on the photochemical reactions of benzil in 2-propanol and benzene-triethylamine (TEA) mixed solvents is reported. The emissive signals observed in 2-propanol are assigned to the benzoyl and benzil ketyl radicals, and the absorptive one observed in benzene-TEA is assigned to the benzil anion radical. The reactions are considered to occur from higher excited triplet (T n ) states through two-photon processes in 2-propanol but from the lowest excited triplet state through a one-photon process in benzene-TEA
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