Synthesis, characterization, and dye performance investigations of azo-coumarin bearing chalcone moieties

Abstract

The preparation of several azo dyes(2a-h) involved the reaction of 4-aminoacetophenone with sodium nitrite to produce the corresponding diazonium salts, which were then permitted to react with 4-Hydroxycoumarin to produce the relevant azo dye (A). The prepared starting material (A) was then reacted with various substituted benzaldehydes to give a new series of chalcone derivatives(2a-h). Additionally, FT-IR and 1H-NMR spectra used to validate the structures of the newly synthesized compounds. Acid and dispersion dyes are employed with all azo compounds to execute dyeing on multi-fiber strips made of acetate, cotton, nylon, wool, acrylic, and polyester fibers. Each fiber was given moderate to exceptional fastness characteristics by all the synthetic dyes.