A facile syntheses and absorption characteristics of some monoazo dyes in bis-heterocyclic aromatic systems part I:syntheses of polysubstituted-5-(2-pyrido-5-yl and 5-pyrazolo-4-yl)azo-thiophene derivatives

摘要

A series of some new bis-hetaryl monoazo dyes derived from different heterocycles has been synthesized from the coupling reactions of diazotized diazo components, polysubstituted 2-aminothiophenes with the corresponding coupling components, 2-pyridone and 5-pyrazolone derivatives, respectively. The structures of these bis-hetaryl azo dyes were confirmed by FT-IR, ~1H-NMR and mass spectroscopy and elemental analyses. Their solvatochromic properties in different solvents were also investigated.