“…Polynuclear aza hydrocarbons are readily identified by fluorescence spot tests after chromatographic separations (417). Ludwig and Herforth have studied the changes in fluorescence caused by the photolytic action of ultraviolet light, especially in solutions of aromatic and heterocyclic compounds (292, 293). Fluorescence properties of the tetracyanoethvlene complexes of some alkylbenzenes have been compared (544)• Other Aromatic Compounds.…”