The synthesis and photo-physical properties of extended styryl fluorescent derivatives of N-ethyl carbazole

The solvatochromic behavior of novel carbazole containing dyes obtained by the condensation of 9-ethyl-9H-carbazole-3-carboxaldehyde and 9-ethyl-9H-carbazole-3,6-dicarboxaldehyde with (1-phenylethylidene) propanedinitrile and ethyl-2-cyano-3-phenyl-2-butenoate are described. The dyes were characterized by FT-IR, 1H NMR, 13C NMR, Elemental analysis and Mass spectra. DSC–TGA analysis showed these dyes are thermally stable up to 300 °C. The UV–Vis absorption and fluorescence emission spectra of the dyes were studied in solvents of differing polarity; the dyes exhibited positive solvatochromism and solvatofluorism.