In this study, a novel gadolinium 2-amino-2-methyl-1,3-propanediol (Amino glycol) complex immobilized covalently on CoFe 2 O 4 magnetite nanoparticles was synthesized. The nanocatalyst was characterized thor- oughly using thermogravimetric analyses (TGA), FT-IR spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray (EDX), inductively coupled plasma optical emission spectroscopy (ICP-OES), vi- brational sample magnetometry (VSM), and powder X-ray diffraction (PXRD). CoFe 2 O 4 @Amino glycol/Gd was found to be efficient for the oxidation of sulfides and synthesis of 5-substituted 1 H -tetrazoles at mild reaction conditions in the green medium. The influences of reaction temperature, solvent, and the amount of catalysts were studied. The best results were obtained in water and without organic solvent condition for 5-substituted 1 H -tetrazoles and oxidation of sulfides, respectively. The catalyst was easily collected via an external magnetic field and further reused at least 6 times without a significant decrease in catalytic activity. The wide applicability of the catalyst, ease of catalyst separation, its reusability capac- ity, and importantly reaction operation in a green medium and elimination of hazardous organic solvents are the advantages of this catalyst.
