Contrasting Intermolecular and Intramolecular Exciplex Formation of a 1,4-Dicyano-2-methylnaphthalene-N,N-Dimethyl-p-toluidine Dyad

[摘要]：An intramolecular exciplex is formed upon excitation of the cyclohexane solution of the 1,4-dicyano-2-methylnaphthalene-N,N-dimethyl-p-toluidine dyad, but little if any intramolecular CT complex exists in the ground state of this substance in solution. In contrast, in the crystalline state, the dyad forms an intermolecular mixed-stack CT complex in the ground state and an intermolecular exciplex when it is photoexcited.

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