Copper‐based Schiff Base Complex Immobilized on Core‐shell Fe 3 O 4 @SiO 2 as a magnetically recyclable and highly efficient nanocatalyst for green synthesis of 2‐amino‐4 H ‐chromene derivatives

Fe 3 O 4 ‐supported copper (II) Schiff‐Base complex has been synthesized through post‐modification with 1,3‐phenylenediamine followed by further post‐modification with salicylaldehyde and coordination with Cu(II) ion. The resulted Fe 3 O 4 @SiO 2 ‐imine/phenoxy‐Cu(II) magnetic nanoparticles (MNPs) were characterized by various techniques including SEM, TEM, XRD, XPS, EDX, VSM, FT‐IR, and ICP. The catalytic activity as a magnetically recyclable heterogeneous catalyst for one‐pot, three‐component synthesis of 2‐amino‐4 H ‐chromene derivatives was examined. The catalyst is efficient in the reaction and can be recovered by magnetic separation and recycled several times without significant loss in the catalytic activity.