Abstract
In this paper we report the results of a study of the time-resolved kinetics of the pyrene excimer in n-hexadecane and in aqueous micelles of cetyltrimethylammonium bromide (CTAB). The experiments in aqueous CTAB show that the kinetic parameters for the excimer formation and dissociation process resemble those obtained in other surfactant studies; the formation process occurs much more slowly in micellar environments than in homogeneous solvents. The complex variation of kinetic parameters and fluorescence lifetimes with changing pyrene:surfactant ratios appears to reflect the changing structure of the CTAB micelle with added solute. The rate constant for the bimolecular excimer formation step does not provide a reliable guide to the viscosity of the medium.
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