Abstract

New Azo dyes derived from amino thiophene as a diazo component with Gamma acid, Tobais acid, and J-acid as coupling components were successfully synthesized. The identity of the dyes was assessed using spectroscopic analysis such as UV-visible spectroscopy, Fourier Transform Infrared Spectroscopy, and melting point. The melting point of the intermediate was observed to be 200-208 0C, while that of the dyes ranges from 195-210 ℃. The percentage yield of the intermediate was calculated to be 48%, while that of the dyes ranges from 55-60%. The dyes absorbed within the visible region of the electromagnetic spectrum in ethanol as solvent ranging from 568-589 nm. The infra-red spectra of the dyes confirmed the presence of the functional groups such as NH/OH at the vibrational frequency range of 3402.50-3410.26 cm-1, aromatic Hydrogen group (Ar-H) at 2924.18 cm-1, C=O group at the frequency of 2322.37 cm-1, CN stretch at 1643.41 cm-1, Azo chromophoric group (-N=N) appear at the frequency range of 1411.94-1527.67 cm-1 and S=O functional group at the vibrational frequency range of 1149.61-1157.33 cm-1respectively. The dyes gave different shades on polyester fabrics and exhibited very good to excellent fastness properties to washing and light.