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Comparisons of the temporal characteristics of the transient absorption with those of the delayed fluorescence for dinaphthylmethanes and dinaphthyl ethers provide compelling kinetic evidence for the formation of intramolecular triplet excimers.

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The kinetics and thermodynamics of tetracyanobenzene-benzene, -toluene, and -p-xylene exciplexes were studied in solvents of different polarity. Equilibrium between formation and feedback dissociation processes is found to be strongly dependent on the solvent polarity and the donor ionization potential. For the systems with the highest rate of feedback dissociation, the process of formation and decay of an exciplex involves a three-state rather than a two-state kinetic scheme. Experimental evidence is provided by a quantitative study of time-resolved fluorescence spectra.