Example of predissociation between separate chromophores in 5-(2-halogenoaryl)-1,3-diphenyl-Δ2-pyrazolines
Abstract
Photoexcited 5-(2-iodophenyl)-1,3-diphenyl-Δ2-pyrazoline undergoes carbon–iodine bond homolysis via energy transfer from the 1,3-diphenylpyrazoline moiety to a dissociative state, whereas photoexcited 5-(5-bromo-3-methoxycarbonylphenyl)-1,3-diphenyl-Δ2-pyrazoline undergoes electron transfer.