Design and synthesis of Fe3O4@SiO2/aza-crown ether-Cu(II) as a novel and highly efficient magnetic nanocomposite catalyst for the synthesis of 1,2,3-triazoles, 1-substituted 1H-tetrazoles and 5-substituted 1H-tetrazoles in green solvents

A New and efficient magnetic nanocatalyst has been fabricated via covalent grafting of an aza-crown ether Cu(II) complex on silica coated iron oxide support. The above mentioned magnetic nanocatalyst has been characterized by various techniques such as SEM, TEM, XRD, FT-IR, TGA and ICP. After preparation, the applicability of this catalyst in the synthesis of triazole and tetrazole derivatives was studied. The prominent features of the present methodology are: high yields, short reaction times, easy preparation, magnetical separation and favorable recoverability of the catalyst (for at least five runs without significant loss of catalytic activity).