Water soluble monoazo dyes which, in the form of the free acids, have the formula:
wherein A represents the residue of a diazo component of the benzene series containing a single sulphonic acid group and optionally one or more other substituents, R' represents hydrogen or lower alkyl and each of R2 and R3 independently represents hydrogen, optionally substituted alkyl or phenyl, or R2 and R3 together with the nitrogen atom to which they are attached form a saturated ring.
The dyes are applicable as acid dyes to natural and synthetic polyamide textile materials on which they give fast bright yellow shades.
The influence of chlorine and sulphonate substituents on the visible absorption maxima of some azo dyes
作者:David Greenwood、Michael G. Hutchings、Brian Lamble
DOI:10.1039/p29860001107
日期:——
A total of 110 arylazo dyes have been prepared, based on five benzenoid and heterocyclic coupling components, and containing combinations of chlorine and sulphonate (sulpho) substituents in the diazo components. Their visibleabsorptionmaxima have been analysed in order to determine the degree to which chloro and sulpho substituentinfluences are constant and transferable, both within a series, and
Colour and constitution of azo compounds derived from diaminoazines
作者:Michael G. Hutchings、Barry H. Meyrick、Anthony J. Nelson
DOI:10.1016/s0040-4020(01)91257-8
日期:1984.1
Visible absorption spectra have been recorded for azo compounds derived from 2,5-dichlorosulphanilic acid azo-coupled with ,-diethyl-m-phenylenediamine, and with azine analogues. The effects of the ring-aza substituents as well as cyano on the spectra indicate a surprising difference in sensitivity of the two ring positions meta to the azo group. M.O. calculations show chat the amino group ortho to