Synthesis and heterogeneous catalytic activity of covalently immobilized hexamine cation as a magnetically-recoverable nanocatalyst

摘要: Functionalized magnetic core–shell nanoparticles Fe3O4-SiO2-HMTA are prepared by co-precipitation method and characterized SEM, TEM, FT-IR, XRD, VSM. The particles spherical with an average size of approximately 48 nm. catalytic activity these was tested in solvent-free synthesis coumarin derivatives. catalyst readily recycled the use external field can be reused four times without significant loss or mass.