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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...
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