Radiolytically generated benzene triplets as sensitizers for energy an combined electron/proton transfer processes

摘要

Pulse radiolysis technique has been employed to investigate energy and electorn transfer reactions involving triplets of naphthols and hydroxybiphenyls. The transient absorption spectra obtained on pulse radiolysis of N_2-saturated solution of naphthols and hydroxybipheyls in benzene are assigned to triplet-triplet absorption. It was found that biphenyl triplets undergo energy transfer to naphthols and hydroxybiphenyls forming the acceptor triplets. On the other hand, benzophenone triplets, favor electron transfer followed by H~+ transfer reaction forming benzophenone ketyl radical and phenoxyl radical of the accetpro. An analogous sequence mimics with 2-naphthol triplets and using benzophenone, acetophenone or chloranil as electron acceptor.