Synthesis and properties of fluorescent bis-quaternized perylene dyes

A series of perylene dyes containing aliphatic trialkylamino and quaternary ammonium groups has been prepared. Perylene dyes containing trialkylamino groups were virtually nonfluorescent Quaternization of the trialkylamino groups with alkyl iodide resulted in an increase in the fluorescence (Qf= 0.8–0.9); the same phenomenon was observed by protonation of the trialkylamino groups in acid media.