Electronic Excited States of the Intramolecular Exciplex and Charge-transfer Complex in (9,10-Dicyanoanthracene)(CH2)3-(Naphthalene)

In the previous paper two kinds of fluorescences due to the intramolecular exciplex (above ∼200 K) and the charge-transfer complex (below ∼160 K) were reported in a nonpolar solution of the (9,10-dicyanoanthracene)(CH2)3-(naphthalene) systems. The fluorescence quantum yields as well as the fluorescence lifetimes of the exciplex and CT complex determined at several temperatures show a discontinuous change from room temperature to 77 K. The radiative and nonradiative decay constants of these fluorescent states suggest that the radiative decay in the exciplex is comparable with the nonradiative decay, while the nonradiative process is predominant in the excited state of the CT complex.