Abstract
Abstract The spectral shifts of the exciplex of methyl 4-(1-pyrene)butyrate with dimethyltoluidine, in mixtures of accetone and cyclopentane, were compared with the shifts of an intramolecular analogue, the exciplex formed on cyclization of both end-labelled polystyrene chains. The shifts are not linear with the mole fraction of the polar solvent. The deviations are due to a ‘dielectric enrichment’ of the solvent shell of the exciplex. The results were interpreted on the basis of a competition between the phenyl groups of the polymer and acetone to the ‘dielectric enrichment’, which depends on the length of the polymer chain.
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