Novel Aza-Substituted Benzothiazol and 1,2,4-Triazol Cyanine Dyes: Synthesis, Characterization and Properties

series of novel dichromophoric dyes based on 2-aminobenzothiazoles and 3-amino-1,2,4 -triazole have been synthesized in high yields. All the dyes have been classified as disperse dyes. Besides their electronic spectroscopic properties, high dye-uptakes on polyester, excellent fastness properties, highly extinction coefficients, and broad solvatochromic effects have been observed in these novel disperse dyes. The derivatives of amino triazole were appropriate as pH indicator in the range of 11-13, as well.