In the present study, we carried out chemical synthesis and characterization of Fe3O4@PEG-Au as a magnetic nanocomposite in aqueous solution by chemical co-precipitation of Fe3+ and Fe2+ ions and encapsulated by poly (ethylene glycol) (PEG) in order to enhancing hydrophilicity, biocompatibility and immobilizing gold ions in the presence of NaBH4 as a reducing agent. Nanostructures were characterized again with FESEM and TEM. The nanoparticles with their spherical shape and dimensions of approximately 12 nm were used as a heterogeneous catalyst for Suzuki coupling reactions whilst in mild conditions. The high efficiency of the catalytic reaction was affirmed by the good yields of products, easy work-up, and absence of leached gold from the support and the smooth recovery of the catalyst. پرونده مقاله