Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
 
BF3-Functionalized Silica-Coated Magnetic Nanoparticles as a Novel Heterogeneous Solid Acid for Synthesis of Formazan Derivatives via a Green Protocol
Abdolhamid BamoniriNaimeh Moshtael-Arani
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2015 Volume 88 Issue 5 Pages 662-672

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Abstract

A new type of green heterogeneous solid acid was prepared by the immobilization of BF3·Et2O on the surface of Fe3O4@SiO2 core–shell nanocomposite (Fe3O4@SiO2–BF3) and characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), field emission scanning electron microscope (FE-SEM), energy-dispersive X-ray (EDS), and transmission electron microscope (TEM). The activity of this super solid acid was probed through the synthesis of aryl diazonium salts as the starting reactant and then, their diazo coupling with aldehyde phenylhydrazones for formation of formazan derivatives in a solvent-free medium at room temperature. This clean and environmentally benign methodology has advantages such as: no need for corrosive and toxic liquid acids, solvents, or buffer solutions, room temperature reaction, high yields, and short reaction times. In addition, long-term stability of aryl diazonium salts supported on the surface of Fe3O4@SiO2–BF3 magnetic nanoparticles (MNPs) at room temperature was one of the most important results of this procedure.

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© 2015 The Chemical Society of Japan
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