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صفحه اصلی
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بیست و نهمین کنفرانس شیمی آلی ایران
Magnetically separable nanocatalyst for selective oxidation of sulfides to sulfoxides
نویسندگان :
MASOMEH BALALI ( دانشگاه صنعتی همدان ) , Hassan Keypour ( دانشگاه بوعلی سینا )
کلید واژه ها :
Oxidation of sulfides،Magnetic nanoparticles،Complex of molybdenum
چکیده مقاله :
A molybdenum complex, [MoO2Cl2(DMSO)2]was immobilized on Schiff base magnetic Fe3O4@SiO2 nanoparticles by covalent linkage. First, superparamagnetic Fe3O4 nanoparticles were prepared by the coprecipitation method. Secondly, the surface of Fe3O4 was encapsulated with silica in order to increase the functionality and stability of nanoparticles. Then, the Fe3O4 nanoparticles were surface-modified with 3-aminopropyltriethoxysilane (APTS) which introduced -NH2 on to the surface of support. For preparation of Fe3O4@SiO2/Schiff base, Fe3O4@SiO2-NH2 nanoparticles were reacted with dialdehyde and then reacted with the MoO2Cl2(DMSO)2 complex to synthesize Mo(VI) nanocatalyst. The resulting nanocatalyst are used as an efficient and recyclable catalyst for the selective oxidation of sulfides to corresponding sulfoxides using urea hydrogen peroxide as the oxidant. Furthermore, the obtained catalysts showed not only high catalytic activity in oxidation reactions but also high degree of chemical stability in various organic solvents.
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