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

Pulse radiolysis technique has been employed to investigate energy and electron transfer reactions involving triplets of naphthols and hydroxybiphenyls. The transient absorption spectra obtained on pulse radiolysis of N2-saturated solution of naphthols and hydroxybiphenyls in benzene are assigned to...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2001-05, Vol.140 (3), p.191-197
Main Authors: Mohan, H., Brede, O., Mittal, J.P.
Format: Article
Language:English
Subjects:
Acetophenone
Chemistry
Exact sciences and technology
General and physical chemistry
Naphthols
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Radiation chemistry
Radiolysis
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Summary:Pulse radiolysis technique has been employed to investigate energy and electron transfer reactions involving triplets of naphthols and hydroxybiphenyls. The transient absorption spectra obtained on pulse radiolysis of N2-saturated solution of naphthols and hydroxybiphenyls 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 acceptor. An analogous sequence mimics with 2-naphthol triplets and using benzophenone, acetophenone or chloranil as electron acceptor.
ISSN:1010-6030
1873-2666
DOI:10.1016/S1010-6030(01)00396-3