Abstract Three disperse azo dyes were synthesized using diazotized dimethyl 2-amino-5- nitroterephthalate (5) followed by the diazo coupling with different N-substituted aromatic amines. The structures of the dyes were confirmed using FT-IR, 1 H NMR, 13 C NMR, MS and HRMS spectral analysis. The geometries of the azo and hydrazone tautomeric forms of the dyes were optimized at B3LYP/6-31G (d) level of theory, and their electronic excitation ...
