Investigation of the Dyeing Ability of Some Reactive Triazine Azo Dyes Containing Pyrazole Fragment

A series of reactive disperse dyes bearing azo and cyanuric groups were synthesized, and their structures were established using spectral and elemental analyses. Methods: The IR, ¹H NMR, and DFT studies indicated that the prepared reactive disperse dyes predominately exist as hydrazone tautomers. The electronic absorption spectra in methanol were observed and compared to those computed using B3LYP/6-311G(d,p). The dyeing efficiency of the produced dispersed reactive dyes was examined on polyester, cotton, and polyester/cotton blended fabrics. Results: The degree of exhaustion and the fastness properties of the dyed samples in terms of perspiration, washing, scorch and light fastness were assessed. It was found that reactive disperse dyes under investigation have a higher affinity for dyeing polyester textiles than cotton textiles. Conclusion: Moreover, the reflectance and color strength of the synthesized dyes were measured and discussed.