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• W2016761842 abstract "Abstract We report a new multistep method for preparing functionalized superparamagnetic Fe 3 O 4 @SiO 2 possessing high saturation magnetization. During the first step, Fe 3 O 4 @SiO 2 nanosphere core–shell is synthesized using nano-Fe 3 O 4 as the core, TEOS as the silica source and PVA as the surfactant. Then, Schiff base complex of metal is synthesized from the reaction between Schiff base and metal acetates [Co(OAc) 2 , Mn(OAc) 2 , Ni(OAc) 2 , Cu(OAc) 2 , Hg(OAc) 2 , Cr(OAc) 3 and Cd(OAc) 2 ] on the Fe 3 O 4 @SiO 2 surface. The structural and magnetic properties of functionalized magnetic silica are identified by transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) instruments. Moreover, functionalized Fe 3 O 4 @SiO 2 possessed a superparamagnetic characteristic with saturation magnetization value of about 34 emu/g. NMR, FT-IR, elemental analysis and XRD were also used for the identification of these structures. The catalytic ability of Fe 3 O 4 @SiO 2 /Schiff base complex of metal ions was found to be an efficient nanocatalyst for the conversion of aldehydes to their corresponding 1,1-diacetates compounds under mild and solvent-free conditions at room temperature. This method gives notable advantages such as excellent chemoselectivity, mild reaction condition, short reaction times and excellent yields. Also, the aforementioned nanocatalyst can be easily recovered by a magnetic field and reused for subsequent reactions for at least 5 times without noticeable deterioration in catalytic activity." @default.
• W2016761842 created "2016-06-24" @default.
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• W2016761842 date "2012-11-01" @default.
• W2016761842 modified "2023-10-16" @default.
• W2016761842 title "Schiff base complex of metal ions supported on superparamagnetic Fe3O4@SiO2 nanoparticles: An efficient, selective and recyclable catalyst for synthesis of 1,1-diacetates from aldehydes under solvent-free conditions" @default.
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• W2016761842 doi "https://doi.org/10.1016/j.apcata.2012.09.010" @default.
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