Synthesis, Structure And Application Of Azo Metal (Cu,Zn)-complexed Dyes

The metallized complexed azo dyes are important metallized complexed dyes used for protein(wool and silk) and polyamide fibers. Conventional metallized azo dyes, containing heavy metal ions such as chromium(III), cobalt(â…¡) produce a large amount of industrial wastewater, which seriously polluting the ecological environment. Since 1980s, the contents of heavy metal ion Cr³⁺ ,Co²⁺ have strictly been limited in textile. At the same time, the price of copper salt and zinc salt is far lower than chromium salt and cobalt salt. So, it is very important to find environmentally friendly iron complex dyes as viable alternatives.In the paper, acetoacetanilide was selected as coupling component to react with with the diazotization components, o-Aminophenol and 2-amino-4-nitropheno-6-sulfoacid to have synthesized to two mordant dyes, for preparation of six metallized complexed azo dyes. Also, and the structures and the character of the metallized mordant dyes were determined by IR, UV, X—ray. In synthesizing 1 : 1 copper, cadmiun, zinc and silver complex dyes, the pH value of reaction system was 3 —4, whereas that in prepartion temperature were all 75 — 80 ℃.By the visible spectra analysis, the structure of the precursor dyes were determined and the metallized complexed dyes characterized, which showing that the maximum absorption wavelength of metallized complexes is between 220nm—500nm, which showed the color of fresh yellow. In addition, the metallized complexed dyes exhibited bathochromic shift in the position of major absorption band with broadening of the absorption curves, compared with that of the corresponding metal-free parent compounds. The molar...