Synthesis, characterization and dyeing behaviour of heterocyclic acid dyes and mordant acid dyes on wool and silk fabrics

Novel heterocyclic acid and mordant acid dyes were synthesised by the coupling of a diazonium salt solution of different aromatic amines with 2-butyl-3-(4-hydroxybenzoyl)benzofuran. The resulting heterocyclic acid dyes were characterized by elemental analysis, IR, H-1-NMR and C-13-NMR spectral studies and UV-Vis spectroscopy. The dyeing performances of all the heterocyclic acid dyes were evaluated on wool and silk fabrics. The dyeing of chrome pre-treated wool and silk fabrics showed better hues on mordanted fabrics. The dyeing of wool and silk fabrics resulted in pinkish blue to red shades with very good depth and levelness. The dyed fabrics showed excellent to very good light, washing, perspiration, sublimation and rubbing fastness.