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An analysis of the intramolecular excimer formation in 2-(1-naphthyl)-ethyl 1-naphthylmethyl ether (DNEME) was carried out, based on spectral data and time-dependent fluorescence intensities at different temperatures and wavelengths. The rate constants for formation and deactivation of the excimer and the values of ΔH and ΔS were determined, according to Förster's kinetic scheme. In addition to fluorescence and radiationless deactivation, the excimer underwent reaction to an endo cycloadduct. The differences in the excimer properties of DNEME, di(1-naphthylmethyl) ether and 1,4-di(1-naphthyl)butane were interpreted in terms of steric factors induced by the type of chain linking the two naphthyl chromophores.
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Todesco et al. (1986) studied this question.
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