Abstract
The kinetics of the 4-carboxybenzophenone triplet excited state quenching by 2,4,6-trimethylphenol and the formation of ketyl and phenoxyl radicals in aqueous β-cyclodextrin solutions have been studied using the laser flash technique. One third of the ketyl and the phenoxyl radicals are formed by a fast process and this formation has been ascribed to a reaction in the cyclodextrin cavity containing both the donor and the acceptor molecules. The rate constant of geminate recombination of triplet radical pairs within the cavity was independent of the external magnetic field up to 0.24 T. The value of this rate constant (1.2 × 10 7 s −1) is close to those for intersystem recombination of contact triplet radical pairs in other organized systems.
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