Generation of diazonium salt over silica imidazole catalyst for dyes production

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Submitted: 03-05-2018
Published: 25-01-2019
Section: Original Research Articles
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Imidazole with p-xylylene dichloride was loaded onto silica in the form of p-xylylene bisimidazolum chloride. Various spectroscopic methods was well characterized the catalyst such as elemental analysis, TGA/DTA, FT-IR and29Si &13C MAS NMR spectra. The silicon solid state nuclear magnetic resonance shows the 4Q, 3Q, 3T, and 2T chemical shifts at expected position. Carbon solid state nuclear magnetic resonance spectrum shows different peaks at different chemical shifts related to the carbon structures of the organic moieties. Coupling reaction of aromatic compounds was carried out with a diazonium salt of aniline to yield a monoazo dye. The diazonium salt was prepared over the heterogeneous catalyst without using homogenous HCl which was necessary to prepared diazonium salt. All dyes were characterized by matching the elemental analysis with the theoretical calculation. Beside this the spectrum of FT-IR, and UV–Visible were recorded. The catalyst was stable and reusable by simple experimental procedure. 

Received: 3rd May 2018; Revised: 5th November 2018; Accepted: 9th November 2018


Surface modification; Rice husk ash; Diazotization; Imidazole; Azo dyes; Coupling reaction.

  1. Mohammed Kasim  Orcid Scopus
    Al Muthanna University, Iraq
    Chemistary Department
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