Abstract
Intramolecular excimer formation in 2,4-diphenylpentanes has been examined in a homologous series of alkanes, in ethanol and in mixtures of ethanol, ethylene glycol and glycerol. The ratio of the emission intensities of dimer and monomer (I D/I M) is not affected in low viscosity solvents but, above 4 cP, viscosity effects are discernible and a relationship of the form I D/I M = A η −2 is obeyed. In methylene chloride, only the dl molecule exhibits a decrease of the efficiency of excimer sampling. The temperature dependence of I D/I M in isooctane and methylene chloride has been interpreted in terms of the activation energy of the excimer sampling.
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