Abstract
The kinetics of the reaction of the triplet states and radicals of 4-carboxybenzophenone (CB) in aqueous sodium dodecyl sulfate micellar solutions in the absence of additives and in the presence of 2,4-dichlorophenoxyacetic acid (DCPA) or 2-methyl-4-chlorophenoxyacetic acid (MCPA) were studied. The rate constants of 3CB quenching by DCPA and MCPA were found to be 8.5 × 105 and 1.4 × 106 s−1, respectively (as calculated for a reactant pair in the micelle). As a result of quenching, radical pairs are produced in the micelle, as well as the ketyl radicals CBH· that lost their partners because of the fast disappearance of some of the DCPA and MCPA radicals. An applied external magnetic field substantially retards the recombination of radical pairs in the micelle.
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