Immobilization of palladium nanoparticles on the magnetic silica– chitosan nanocomposite (NiFe2O4@SiO2@ CS-Pd NPs): the synthesis, characterization and catalytic efficiency in C-C coupling reactions

NiFe2O4 nanoparticles have been prepared by co-precipitation procedure. They have been coatedwith SiO2 following the Stöber process to prepare core–shell nanocomposite. Then, chitosan was covalentlyconnected with silica to provide an excellent stabilizer and biosupport for the immobilization of Pd metal.This magnetic bionanocomposite was characterized using FT-IR, FESEM, TEM, XRD, VSM and ICP. TheNiFe2O4@SiO2@CS-Pd NPs was found as a magnetically separable and highly active catalyst for Suzukicoupling reactions of various aryl halides with substituted phenylboronic acids. Under appropriateconditions, all reactions afforded the desired products in excellent yields at short reaction times. Moreover,this catalyst can be easily recovered by using a magnetic field and directly reused for several times withoutsignificant loss of its activity.

کلیدواژه ها:

Nanocomposites ، Magnetic nanoparticle support ، Heterogeneous catalysts ، Chitosan ، Magnetic separation