ARTICLE This journal isA molybdenum complex, [MoO 2 Cl 2 (DMSO) 2 ], was immobilized on amino propyl and Schiff base modified magnetic Fe 3 O 4 @SiO 2 nanoparticles by covalent linkage. The resulting nanoparticles were used as efficient and recyclable catalysts for the selective oxidation of sulfides to sulfoxides using urea hydrogen peroxide as the oxidant. The complete characterization of catalysts was carried out by means of thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), elemental analysis, FT-IR and Raman microprobe techniques.

A copper catalyst has been explored as an efficient and recyclable catalyst to effect Sonogashira and Suzuki cross-coupling reactions. After modification of 2-(((piperazin-1-ylmethyl)imino)methyl)phenol (PP) on the surface of amorphous silica-coated iron oxide (Fe 3 O 4 @SiO 2 @Cl) magnetic core-shell nanocomposite, copper(II) chloride was employed to synthesize the Fe 3 O 4 @SiO 2 @PP-Cu catalyst, affording a copper loading of 1.52 mmol g −1 . High yield, low reaction times, nontoxicity and recyclability of the catalyst are the main merits of this protocol. The catalyst was characterized using Fourier transform infrared, X-ray photoelectron, energy-dispersive X-ray and inductively coupled plasma optical emission spectroscopies, X-ray diffraction, scanning and transmission electron microscopies, and vibrating sample magnetometry.

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