Syntheses of (E)-4-(2-(4-methoxyphenyl)diazenyl)benzene 1,3-diol and (E)-1-(2-(4-hydroxyphenyl)diazenyl)-2-naphthol and their application as acid base indicator and in jute dyeing

摘要

Two novel azo-dyes namely (E)-4-(2-(4-methoxyphenyl)diazenyl)benzene 1,3-diol (L-1) and (E)-1-(2-(4-hydroxyphenyl)diazenyl)-2-naphthol (L-2) have been synthesized by the usual method of diazotisation followed by coupling reaction it pH. 7.5. The synthesized dyes are characterized by elemental analysis and UV-Vis, IR, H-1 NMR, mass spectrophotometry. These synthesised compounds are found to exhibit significant dyeing property on bleached jute substrate under neutral and particularly basic pH condition with good colour yield And wash fastness. Moreover the acid base indicator property of L-2 being more prominent than that Of L-1, the parameters measuring the performance of the former as an indicator have also been evaluated spectrophotometrically and condutometrically in this paper. The study shows better performance of L-2 than methyl orange, particularly for titration of dilute solutions.