Abstract
Dual fluorescence a and b of 9-morpholinoacridine (9-MAc) in butyronitrile between 140 K and 200 K is observed. The excitation spectra of a and b differ: the high-energy emission b is preferentially excited within the first excited state S 1, whereas the low-energy emission a within the second, S 2. The subtraction of the fast component from the total a emission indicates that both fluorescences are kinetically coupled. The kinetics of the transient absorption band correspond to those of secondary fluorescence. Luminescence properties of 9-MAc can be explained in terms of the TICT state model.
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