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Rate constants for both radiative and non‐radiative relaxation of the fluorescent state of indole and several methyl‐indoles in solution have been calculated from fluorescence lifetime and quantum yield values. Radiative relaxation for indoles is solvent dependent while non‐radiative relaxation is attributed to at least two processes, one of which is both solvent and temperature dependent. The latter process measured in aqueous solvents manifests a pattern of compensation of activation enthalpy by activation entropy with an isokinetic temperature for indole of 283°K. A quantitatively consistent description of the excited‐state behavior of 1‐Me‐indole in both free and exciplex state is provided. Small deviations in fluorescence parameters for indole suggest a more complicated set of events.
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Walker et al. (1971) studied this question.
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