Chemistry Department, Faculty of Science, Alexandria University, P.O. 426, Ibrahemia, Alexandria, 21321, Egypt.
Chemistry Department, Faculty of Science, Taibah University, Yanbu, 46423, Saudi Arabia.
Sci Rep. 2023 May 15;13(1):7826. doi: 10.1038/s41598-023-34660-4.
Benzidine was coupled with ethyl cyanoacetate, and malononitrile, to give azo-hydrazo products which in turn were cyclized by using hydrazine and phenyl hydrazine to give 4,4'-([1,1'-biphenyl]-4,4'-diylbis(hydrazin-2-yl-1-ylidene))bis pyrazole derivatives 5-7. These compounds were identified by various spectral analysis. The examination of 0.1 M NaOH and 0.1 M HCl in DMF revealed that the λ of the synthesized dyes are quite sensitive to pH variation and slightly affected by the coupler moieties. Utilizing the dispersion agent DYEWELL-002, polyester fabric (PE-F) was dyed in water. The color strength (K/S), its summation (K/Ssum), dye exhaustion (%E) and reflectance values were measured and discussed. The DFT method estimates the chemical descriptor parameters of the titled dyes, using B3LYP/6-31G(d,p) level to investigate the performance of dyes as well as to postulate a mechanism of dyeing process.
联苯胺与乙基氰乙酸酯和丙二腈偶联，得到偶氮腙产物，然后用肼和苯肼环化，得到 4,4'-([1,1'-联苯]-4,4'-二基双(肼-2-基-1-亚基))双吡唑衍生物 5-7。这些化合物通过各种光谱分析进行了鉴定。在 DMF 中检查 0.1 M NaOH 和 0.1 M HCl 时发现，合成染料的 λ 值对 pH 变化非常敏感，并且稍微受偶联基团的影响。利用分散剂 DYEWELL-002，在水中对聚酯纤维（PE-F）进行染色。测量并讨论了颜色强度（K/S）、其总和（K/Ssum）、染料利用率（%E）和反射率值。使用 B3LYP/6-31G(d,p) 水平，DFT 方法估算了标题染料的化学描述符参数，以研究染料的性能并假设染色过程的机理。
