Abstract
A series of monoazo dyes has been obtained using 4-aminonaphthalimide and 4-amino-N-methylnaphthalimide and their 3-sulpho derivatives as diazo components. Derivatives of 1- and 2-naphthol were used as coupling components. It was found that in the electronic spectra of these dyes, additional bathochromically shifted bands of different intensity appear. This effect is caused by the occurrence of the dyes in equilibrium of azo and hydrazone forms. The sulpho group in the ortho(3-) position to the azo group influences the dulling of the colour by weakening coupling between the two parts of the dyes. At the same time, it gives better solubility and increases exhaustion and fastness on wool and polyamide.
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