In this study, for the first time, NiFe2O4@ZnMn2O4 magnetic nanocomposites (MNCs) were synthesized using a simple green sol–gel method. The synthesized nanocomposites comprehensive characterized using various analytical techniques including X-ray Photoelectron Spectroscopy, powder X-ray diffraction (XRD), transmission electron microscope, field emission scanning electron microscopy, energy dispersive X-ray analysis, vibrating sample magnetometer, Brunauer Emmett Teller, and elemental mapping. XRD confirmed the spinel crystal structure of NiFe2O4@ZnMn2O4 MNCs. ZnMn2O4 has tetragonal spinel structure while NiFe2O4 cubic. In microwave-assisted tetrahydropyrimidine and polyhydroquinoline derivative production, NiFe2O4@ZnMn2O4 MNCs showed good catalytic activity. An external magnet can remove catalyst from reactions, and their efficacy stays stable after four cycles.
