Formation of solvated ion radicals in the pyrene-N,N-dimethylaniline (DMA) system (which is a typical one showing heteroexcimer (HE) fluorescence) in various solvents has been studied by means of the laser photolysis and transient photoconductivity as well as transient absorption measurements. Ion radical formation due to the encounter collision between an excited pyrene and DMA in moderately as well as in strongly polar solvents has been established. This result is quite important in explaining the experimentally observed relation between the solvent dependent HE fluorescence quantum yield and decay time.
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Taniguchi et al. (1972) studied this question.
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