Synthesis, Characterization of Novel Bisheteroaryl Bisazo Dyes, and Their Dyeing and Solvatochromic Behavior

4-Phenyl-2-aminothaizole was diazotized and coupled with N-(alkyl)-2-oxo-3-cyano-4-methyl-6-hydroxypyridine (2-pyridone). The resultant dyes were named as N-(alkyl)-6-hydroxy-4-methyl-2-oxo-5-((4-phenylthiazole-2-yl)diazenyl)-1,2-dihydro pyridine-3-carbonitrite and duly characterized. The diazotized aryl amines were then coupled to a moiety of above-mentioned dyes at 5-position of thiazole. The obtained bisheteroaryl azo dyes were characterized by elemental analysis and spectral studies. Solvent effects on the visible absorption spectra of the dyes were evaluated. The color of the dyes is discussed with respect to the nature of the heterocyclic ring, aromatic amines, and substituents present therein. All these dyes were applied as disperse dyes on to polyester fabrics, and their fastness properties were evaluated. (c) 2013 Wiley Periodicals, Inc. Heteroatom Chem 24:208220, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/hc.21085