Abstract
Reactions of the upper triplet states of biphenyl and its halogenated derivatives were investigated in aqueous micellar systems at room temperature with a two-step excitation method. Irradiation of the triplet states of biphenyl and its chloro and bromo derivatives produced hydrated electrons (e aq −) and a decrease in the triplet states. No evidence of carbonhalogen bond homolysis, with a rate competing with e aq − formation (τ<1 ps), was obtained for the compounds investigated. The yield of photo-ionization was markedly reduced in a cationic micelle, i.e cetyltrimethylammonium bromide, compared with that in an anionic micelle, i.e. sodium dodecylsulfate. This is becase of the enhanced geminate recombination of electron—cation pairs caused by the positive micellar surface charge which prevents the escape of electrons from the cationic micelle.
Published Version
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