Abstract
A long-wavelength fluorescence shift for the simplest compound from this group, 2-(pyridyl-4)-5-phenyloxazole (I, Ar = C6H5), relative to its isoelectronic analog, 2,5-diphenyloxazole, is 30 nm in ethanol. Electron-donor substitution of the phenyl radical which is coupled to the pyridyl group, further increases the long-wavelength fluorescence shift. Regardless of the substituent, however, the luminophore emission (Imax = 400-460 nm in ethanol) remains within the blue-green region [3]. This excludes the possibility of using them as luminescent components of day fluorescent pigments (DFP) with a broad color pattern without any additional luminophores or nonluminescent dyes. This substantially limits possible applications of the compounds II, despite their high quantum yields (q = 0.68-0.87 in ethanol [3]). More promising for pract ical applications are quaternary sa l ts of 2,5-diaryloxazole pyridine analogs synthesized by Afanasiadi et al. [3] by quarternization of luminophores I with benzyl chloride or ethyl ether of ntolylsulfonyl acid:
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