Core–shell structured magnetic silica supported propylamine/molybdate complexes: an efficient and magnetically recoverable nanocatalyst

Abstract

In the present study, a novel core–shell structured magnetic silica supported propylamine/molybdate complex (Fe₃O₄@SiO₂/Pr-NMo[Mo₅O₁₈]) is prepared, characterized and applied as an effective and easily recoverable nanocatalyst. The chemical composition, crystalline structure, thermal stability, morphology and particle size of this nanomaterial were studied using Fourier transform infrared (FT-IR) spectroscopy, energy dispersive X-ray (EDX), transmission electron microscopy (TEM), powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermal gravimetric (TG) and vibration sample magnetometer (VSM) analyses. This nanomaterial was used as an efficient and magnetically reusable catalyst for the synthesis of pyrano-pyrazole derivatives under moderate conditions and gave the corresponding products in high yield and selectivity.