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A novel magnetically recoverable copper nanocatalyst was fabricated via the immobilization of a copper complex on the surface of silica-coated magnetic nanoparticles modified with a novel Schiff base ligand [Fe 3 O 4 @SiO 2 -bis(aminopyridine)-Cu]. FT-IR spectroscopy, SEM, TEM, EDX, VSM, XRD, XPS, TGA and AAS, ICP-OES techniques were applied to characterize the structure of the as-fabricated [Fe 3 O 4 @SiO 2 -bis(aminopyridine)-Cu(II)] nanocomposite. TEM and SEM analysis confirmed that the typical silica shell thickness was assessed to be around 20 nm. Catalytic studies revealed that the Fe 3 O 4 @SiO 2 -bis(aminopyridine)-Cu(II) nanocomposite is a highly efficient and green nanocatalyst for the synthesis of benzothiazoles and polyhydroquinolines. The [Fe 3 O 4 @SiO 2 -bis(aminopyridine)-Cu(II)] nanocatalyst could be easily recovered by a simple magnetic separation and recycled at least 6 times without deterioration in catalytic activity.

Magnetic Nanoparticles Supported Copper Nanocomposite: A Highly Active Nanocatalyst for Synthesis of Benzothiazoles and Polyhydroquinolines