The present study aims to synthesize some new bis-thiazolylazo derivatives for the creation of antimicrobial dyes and their application on polyester fabrics. The new bis-thiazolylazo dyes were synthesized by the addition of isothiocyanatobenzene to 2-amino-5-arylazothaizole derivatives followed by cyclization via chloroethanoyl chloride, and coupled with sulphathiazole diazonium salt. The synthesized analogs were proven through spectroscopic tools (FTIR and 1H NMR). The prepared dyestuffs were applied on polyester fabrics after investigation of the optimal conditions for colorfastness. The application of enhanced dyes with the optimal conditions revealed good colorfastness outcomes and respectable antibacterial efficacies toward both Gram-positive and Gram-negative bacteria for the dyed fabrics.
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