Fluorescent Styryl Dyes from 4-Chloro-2-(Diphenylamino)-1, 3-Thiazole-5-Carbaldehyde-Synthesis, Optical Properties and TDDFT Computations.

4-Chloro-2-(diphenylamino)-1,3-thiazole-5-carbaldehyde was reacted with an active methylene compounds, cyanomethyl benzimidazole, cyanomethyl benzothiazole, barbituric acid and Meldrum's acid under Knoevenagel conditions to give novel push-pull styryl chromophores 8a-8d. The synthesized styryl chromophores were characterized by FT-IR, Mass and (1)H NMR spectral analysis. The photophysical characteristics of these styryl chromophores were evaluated.

Study on Synthesis and Fluorescence of Novel Benzofused Phenazine π-Conjugated Skeleton with Coumarin and Isophoron Cores.

The novel benzofused phenazine π-conjugated skeleton with a coumarin and isophoron core was synthesized, characterized, and condensed with suitably substituted active methylene compounds by classical Knoevenagel condensation reaction to obtain novel mono-styryl dyes 6a-6d. These novel styryl dyes have hue varying from yellow to violet. The geometries of the styryl dyes were optimized at B3LYP/6-31G (d) level of theory, and their electronic excitation properties were evaluated using density functional theory.