Synthesis and application of 4-methoxybenzeneazo-2'- naphthol and 2-nitrobenzeneazo-2'-naphthol on wool, silk and nylon fabrics

摘要

Two novel azo-dyes were synthesized by coupling of diazo solutions of p-anisidine and 2-nitro aniline with sodium-2-naphthoate followed by acidification at ice cold condition. The resultant dyes namely 4-methoxybenzeneazo-2'-naphthol and 2-nitrobenzeneazo-2'-naphthol were characterized by elemental analysis as well as IR, ~1H NMR, ~(13)C NMR, and mass spectral studies. The UV-VTS spectral data has also been discussed in terms of structural property relationship. The dyeing assessment of the synthesized dyes was evaluated on wool, silk, and nylon fabrics. The results showed better hue with good colorfastness to washing, rubbing, and light. The dyes were also evaluated for in vitro antibacterial activity against different strains of gram-negative and gram-positive bacteria. The results of the antibacterial properties of these dyes revealed that both the dyes were resistant to aerobic bacterial degradation but dye 2 showed more antibacterial effect than dye 1.