Mechanism of Photosensitized Chemiluminescence of 2-Methyl-6-phenylimidazo[1,2-a] pyrazin-3(7H)-one (CLA) in Aqueous Solution

The photosensitized chemiluminescence (CL) of 2-methyl-6-phenylimidazo[l,2-a]pyrazin-3(7H)-one (CLA) in aqueous solution of Rose Bengal near pH 7 has been investigated. Three time profiles (fast decay, fast rise-and-decay, and very slow decay components) of CL were observed at 380 nm. The former two terms were due to the Type II and Type I reactions, respectively. The intermediates of the each reactions were apparently different.