Azo dyes:
The azo dyes contain one or more azo groups - N=N-, as the chromophore. Azo dyes constitute the largest and most important group of synthetic dyes. These may be building by diazotising an aromatic amine and subsequent coupling with a suitable aromatic phenol or amine.
The important types of azo dyes are as given,
Azo dyes are highly coloured. Azo dyes can be further split into basic, direct, acid, ingrain or prepared dyes, etc., on the basis of type of application.
(c) Tri aryl methane dyes: In these dyes, the central carbon is bounded to three aromatic rings. One of which is in the quinonoid type. Malachite green is the general example of this type.
Rosaniline and crystal violet are other two other important dyes of that type.
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