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چکیده
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Oxidation of organic substrates are promising process in chemical transformation from both industrial and synthetic chemists point of view. Recently, considerable attempts have been devoted to the preparation and application of transition metal complexes as oxidation catalysts. Herein, oxoperoxo complexes of vanadium (V) and tungsten (VI) immobilized on the Fe3O4 magnetic nanoparticles (VO(O2)@Fe3O4 and WO(O2)@Fe3O4) were prepared and characterized by FT-IR, SEM, EDX, TEM, XRD, TGA, BET and VSM techniques. EDX analysis, confirmed the presence of V and W in 7.71 and 4.55 wt%. VSM analysis revealed that the synthesized VO(O2)@Fe3O4 and WO(O2)@Fe3O4 have superparamagnetic properties with saturation magnetization of 9 and 27 emu/g, respectively. Surface area, total pore volume and average pore diameter of VO(O2)@Fe3O4 and WO(O2)@Fe3O4 was determined to be 18.807 m2g-1, 0.1273 cm3g-1 and 27.071 nm, and 56.136 m2g-1, 0.2324 cm3g-1 and 17.491 nm, using BET analysis respectively. The catalytic activity of the prepared VO(O2)@Fe3O4 and WO(O2)@Fe3O4 in the oxidation of alcohols with H2O2 was studied, which afforded corresponding carbonyl compounds in moderate to high yields. The catalytic performance of the VO(O2)@Fe3O4 was also investigated in the oxidation of sulfide derivatives. High catalytic activity, easy separation using an external magnetic field and recoverability of the catalysts are some advantageous of this protocol.
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