An Overview of Preparation for Different Azo Compounds
DOI:
https://doi.org/10.22401/3m6bbr80Keywords:
Azo dyes, azo groups, coupling of diazonium, chromophore, hydrophilic fibres, fastness, monoazoAbstract
Azo compounds are a class of organic materials that have the group R-N=N-R' where the substitution group R and R' are aromatic or heterocyclic sides. The azo compounds have a variety of applications including dyes, pigments, and pharmaceuticals. The preparation and characterization of different azo compounds is an important area of research in organic synthesis. The azo compound synthesis typically involves the diazotization process for coupling between an aromatic amine and another aromatic compound containing an activating group such as -OH, -NH2, or -NR2. The reaction conditions must be carefully controlled to prevent side reactions, such as the formation of unwanted byproducts. Once synthesized, azo compounds can be characterized using a variety of techniques including UV-Vis spectroscopy, NMR spectroscopy, and mass spectrometry. UV-Vis spectroscopy is a commonly used technique for characterizing azo compounds. The absorption spectrum of an azo compound typically exhibits a strong absorption band in the visible region due to the delocalized π-electrons in the azo group. While in FTIR, the loss of the amine peak and showing a weak peak at about 1550 cm− 1 for the (N = N) group, indicates the presence of Azo. The preparation and characterization of different azo compounds is a significant field of research in organic chemistry, which are applied as acid and base indicators, food coloring, optical switches, liquid crystal and in medicine. By carefully controlling the synthesis conditions and using a variety of characterization techniques, researchers can gain a better understanding of the properties and applications of these compounds.
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