Preparation and catalytic study on a novel amino-functionalized silica-coated cobalt oxide nanocomposite for the synthesis of some indazoles

Abstract

In this research an efficient synthesis of a novel nanocomposite including SiO₂@(3-aminopropyl)triethoxysilane-coated cobalt oxide (Co₃O₄) nanocomposite has been reported by three step method. The structure and magnetic characterization of Co₃O₄@SiO₂@NH₂ have been done by using various spectroscopic analyses which include FT-IR, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and vibrating sample magnetometry. Amino-functionalized SiO₂ coated Co₃O₄ nanocomposite exhibited superparamagnetic behavior and strong magnetization at room temperature. The average crystallite sizes of the Co₃O₄ are 23.7 nm. The obtained magnetic nanocomposite showed excellent catalytic activity as a new heterogeneous magnetic catalyst for the synthesis of some indazole derivatives under mild reaction conditions along with high level of reusability.