Exciplex Emission. Styrenes form singlet exciplexes with tertiary amines, and photoaddition of the amines to the styrenes has been presumed to proceed via the exciplexes as described above?*'Photoaddition of amines to stilbene has also been proposed to proceed from exciplexesS5 The fluorescence spectra of la, IC, and Id (Table I) clearly showed the formation of intramolecular exciplexes. The charge-transfer character of the exciplexes ...
