Green methodology to synthesis heterocyclic diazo dyes using superacid Aquivion® PFSA PW98 as an efficient catalyst
Year: 2025
Type: article
Abstract: A heterocyclic diazo dye containing the coumarin structure, specifically 7-hydroxy-4-methyl-8-(4-nitrophenyl azo)-6-(4-nitrophenyl azo) coumarin, was prepared using Aquivion PFSA resin. This resin has been shown to be an interesting, effective, and selective acidic catalyst in the diazotization reaction. The dye was obtained by reacting a double molar amount of the aromatic amine, 4-nitro aniline, and then mixing the resulting diazonium salt with one mole of 7-hydroxy-4-methyl coumarin. The purity of this dye was confirmed by measuring the melting point and by thin-film chromatography (TLC). The molecular structure of the dye and the Azo-Hydrazone tautomeric was proven through spectroscopic methods such as 1H-NMR spectroscopy , UV-VIS and infrared spectroscopy IR.
Author: Fadia Al-Haj Hussien
Language: English
Subfield: Spectroscopy
Field: Chemistry
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,500
OpenAlex ID: W4412981246