LUMINESCENT PROPERTIES OF OXAZOL DERIVATIVES WITH ANNELATED AROMATIC AND HETEROCYCLIC NUCLEI IN NEUTRAL AND ACID-MEDIA

Luminescent and acid-base properties on hydrogen bond formation stage and protonation of compounds with annelated aromatic and heterocyclic nuclei, resulting from introduction of bridging groups -CH=CH- (I) -CH=N- (II), and -CO-N(CH3)- (III) in 4 and 2' positions of 4''-substituted derivatives of 2.5-diphenyloxazol, have been investigated. The nature of the reaction center has been determined. Its sensitivity towards substituent electrjnic influence has been analysed and the reasons of observed distinctions in properties of compounds of different reaction series have been discussed. Comparative analysis of fluorescent properties of neutral and protonated forms of the oxazole derivatives was carried out with the conclusion about possibility of laser emission generation by reaction series (I) protonated compounds.