Azo dyes are organic compounds bearing the functional group R−N=N−R′, in which R and R′ are usually aryl and substituted aryl groups. They are a commercially important family of azo compounds, i.e. compounds containing the C−N=N−C linkage. [1] .

azo dye, any of a large class of synthetic organic dyes that contain nitrogen as the azo group ―N=N― as part of their molecular structures; more than half the commercial dyes belong to this class.

Azo dyes represent the largest production volume of dye chemistry today, and their relative importance may even increase in the future. They play a crucial role in the governance of the dye and printing market. These dyes are synthesized from …

2023年6月9日 · Azo dyes are the most significant category of synthetic colorants and the most prevalent class of dyes in use today. There are different systems of classification for azo dyes. Disperse dyes, such as Disperse Orange, are included in some classes.

Azo dyes are the largest group of artificial food dyes, including 70% of the organic dyes generated in the world. Moreover, the commonest azo dyes in the food industry have been considered to be the yellow dyes (sunset yellow and tartrazine) and …

2010年4月2日 · Azo dyes are widely used in the food, pharmaceutical, cosmetic, textile, and leather industries. They are synthetic compounds characterized by one (monoazo) or several intramolecular NQN bonds. Azo dyes, if they are systemically absorbed, can be metabolized via azoreductases of intestinal microflora by liver cells and skin surface bacteria ...

One of most widespread class of synthetic dyes is azo dyes. Since the discovery of diazo compounds by Peter Greiss in 1858, series of different types of azo dyes have been synthesized and marketed.

2020年1月31日 · In this work, we have presented a very detailed review of the different classification of azo dyes as a function of the number of azo groups and the appropriate functional groups. Then we...

Azo dyes are substances with one or more azo groups (-N=N-) coupled with two mono- or polycyclic aromatic systems in their structure. Unlike most organic compounds, azo dyes possess color; as a result, azo compounds have various usages.

2014年9月8日 · This chapter contains a discussion of the fundamental structural chemistry of azo colorants, including a description of the types of isomerism that they can exhibit, the principles of their synthesis, and a discussion on the ability of azo dyes to form metal complexes.