fabrication and characterization of the immobilized cu(ii) and ni(ii) species on silica-coated copper ferrite: as novel magnetically reusable nanocatalysts toward synthesis of biscoumarins

In this study, we have synthesized magnetically nanoparticles (mnps) of cufe2o4@sio2@aaptms@ni(ii) and cufe2o4@sio2@aaptms@cu(ii). the prepared nanocomposite systems were characterized using scanning electron microscopy, fourier-transform infrared spectroscopy, x-ray diffraction, energy-dispersive x-ray spectroscopy, brunauer–emmett–teller analysis, vibrating-sample magnetometer and inductively coupled plasma optical emission spectroscopy. catalytic activity of cufe2o4@sio2@aaptms@ni(ii) and cufe2o4@sio2@aaptms@cu(ii) mnps was also studied toward one-pot the knoevenagel–michael reaction of aromatic aldehydes with 4-hydroxycoumarin. all reactions were carried using 40 mg of the nanocatalysts in refluxing h2o within 12‒45 min to afford biscoumarin materials in 84–96% yield. the obtained results exhibited that catalytic activity of the ni(ii)-composite system was higher than the cu(ii)-analogue. moreover, reusability of the nanocatalysts was examined for five consecutive cycles without the significant loss of the catalytic activity.