BF۳-Functionalized Silica-Coated Magnetic Nanoparticles as a Novel Heterogeneous Solid Acid for Synthesis of Formazan Derivatives via a Green Protocol

چکیده مقاله

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 environmental methodology had advantages such as: no need to corrosive and toxic liquid acids, solvents, and buffer solutions, room temperature, 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.