2-Amino-4-chloro-5-formylthiophene-3-carbonitrile derived azo dyes

Add time:08/17/2019    Source:sciencedirect.com

Six azo dyes derived from the common 2-amino-4-chloro-5-formylthiophene-3-carbonitrile unit and different aniline based couplers were synthesized by the traditional diazotization-coupling strategy. Solvatochromism has been studied for this family of donor−π−acceptor heterocyclic azo dyes. Furthermore, UV–Vis spectral comparisons (maximum absorption wavelength, molar extinction coefficient and full width at half maximum) have been made between the six new azo dyes reported in this work and four previously reported 4-nitro-4′-amino-azobenzene disperse dyes. In addition, X-ray single-crystal structure of one representative azo dye has been included, which constitutes the first structural report on azo dyes containing the 2-amino-4-chloro-5-formylthiophene-3-carbonitrile diazo component.

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