Spectroscopic and dyeing performance of disperse dyes derived from 2-amino-5-nitrothiazole.

Abstract

The synthesis of disperse dyes derived from 2-amino-5-nitrothiazole was carried out and their spectroscopic and dyeing properties examd. The electronic absorption spectra cover a λmax ranue of 453-654nm in acetone at uniformly high absorption intensity between 5.00 × 104 - 5.93 × 104 1mol-1 cm-1 and gave bright intense hues from red to blue on polyester fabrics, due to the variations in polarity. The dyes also exhibited pos. solvatochromism with increase in polarity of the solvents and pos. halochromism when a few drops of hydrochloric acid were added to the ethanolic soln. of the dyes. Dyeing of polyester with these dyes was carried out with different concn. of carrier and it was found that exhaustion increased with increase carrier concn. and the depth of shade became deeper. The dyed fabrics generally showed good to excellent washing, perspiration, and light fastness properties on polyester woven fabric. The remarkable degree of levelness and brightness after washing is indicative of good penetration and excellent affinity of these dyes for the polyester fabric due to the accumulation of polar groups. [on SciFinder(R)]