Abstract:
the present work, a new magnetic nanoparticle supported N-heterocyclic carbene-palladium(II)
(NO2-NHC-Pd@Fe3O4) nanomagnetic catalyst was synthesized by a facile multistep synthesis under aerobic
conditions using inexpensive chemicals. The NO2-NHC-Pd@Fe3O4 nanomagnetic catalyst was characterized
by various analytical techniques such as attenuated total reflectance infrared spectroscopy (ATR-IR), inductively
coupled plasma-atomic emission spectroscopy (ICP-AES), energy-dispersive X-ray spectroscopy (EDS),
field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray
powder diffraction (XRD), thermogravimetric analysis (TGA) and Brunauer–Emmett–Teller surface area
analysis (BET). The synthesized NO2-NHC-Pd@Fe3O4 nanomagnetic catalyst showed excellent catalytic
activity in both Suzuki–Miyaura and Mizoroki–Heck cross-coupling reactions for various substrates under
mild reaction conditions. Recovery of the NO2-NHC-Pd@Fe3O4 nanomagnetic catalyst from the reaction
mixture was easily accomplished by applying an external magnet. The recovered NO2-NHC-Pd@Fe3O4
nanomagnetic catalyst exhibited very good catalytic activity up to seven recycles in Suzuki–Miyaura and
five recycles in Mizoroki–Heck cross-coupling reactions without considerable loss of its catalytic activity.
