Silicon-Containing Azo Dyes

Abstract

In an examination of the dyeing properties and lightfastness of some azo dyes, prepared by coupling several diazonium salts with m-trimethylsilyl- and m-triphenylsilyl-dimethylaniline, it has been observed that most of the dyes have a fairly good substantivity for cellulose acetate, nylon, silk, and wool, but their lightfastness varies from moderate to good.

In a comparative study of the shades obtained from 2-naphthol and its 6-trimethylsilyl and 6-triphenylsilyl derivatives, by the ingrain process, it has been found that the R₃Si substituent has an unfavorable effect on both the substantivity and the lightfastness.

Absorption spectra of some silicon-containing azo dyes have been recorded, and the spectra have been compared with those of the corresponding hydrogen and methyl analogues. The gen eral bathochromic shift observed in the spectra of the silicon-containing azo dyes has been attributed to the crowding effect of the bulky R₃Si group.

An examination of the pH range of some silicon-containing azo dyes has revealed that the R₃Si substituent does not have any favorable effect on the pH range of the dyes.

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