Abstract
Intramolecular exciplex (EX)-formation system involving phenanthrene and cyanobenzoate moieties, (9-phenanthroxy)-alkyl cyanobenzoate ( 1a-c), were investigated in terms of emission maxima, lifetimes, and quantum yields of the emissions from the locally excited state and the EX state. The intense EX emissions of 1a-c were observed in seven kinds of solvents from cyclohexane to dichloromethane. From the solvent effects on EX emission maxima, the dipole moments of the EX of 1a-c were calculated to be 15–16 D. Moreover the deviation of the emission maxima in benzene and toluene from the Mataga-Lippert plots was observed, showing that the EX was stabilized by termolecular interaction of EX with these solvents.
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