Schiff base complex of palladium immobilized on magnetic nanoparticles: an efficient and recyclable nanocatalyst for CC coupling reactions

Abstract

A Schiff base complex of palladium anchored on Fe3O4 magnetic nanoparticles as an efficient and magnetically reusable nanocatalyst is reported for CC bond formation through Heck and Suzuki reactions. The catalyst was easily recovered and reused several times without significant loss of its catalytic efficiency or palladium leaching. The magnetic nanocatalyst was characterized using Fourier transform infrared and inductively coupled plasma atomic emission spectroscopies, thermogravimetric analysis, vibrating sample magnetometry, and transmission and scanning electron microscopies. Copyright © 2016 John Wiley & Sons, Ltd.

The solvent‐free synthesis of polysubstituted pyrroles by a reusable copper Schiff base complex immobilized on silica coated Fe3O4, and DNA binding study of one resulting derivative as a potential anticancer drug

“…The introduction of silica layer to the surface of naked Fe 3 O 4 is confirmed by the sharp band at 1078 cm −1 assigned to the Si‐O‐Si anti‐symmetric stretching vibration . The synthesized Fe 3 O 4 @SiO 2 @Cl possesses the main peak at 2840 to 2918 cm −1 which indicates the presence of the anchored propyl group of CPTMS on magnetic NPs by C–H stretching vibrations . Reaction of CPTMS coated nanoparticles with copper Schiff base produces Fe 3 O 4 @SiO 2 @CuSB in which the presence of imine stretching band is asserted with 1628 cm −1 bands in Figure (d) spectra.…”

“…The strong absorption signal observed at 570 cm −1 is attributed to the Fe‐O bond stretching vibration. The broad band at 3000–3500 cm −1 is referred to the absorption of –OH stretching of surface hydroxyl groups . The introduction of silica layer to the surface of naked Fe 3 O 4 is confirmed by the sharp band at 1078 cm −1 assigned to the Si‐O‐Si anti‐symmetric stretching vibration .…”

Advances in Magnetic Nanoparticles-Supported Palladium Complexes for Coupling Reactions

“…Fe 3 O 4 NPs were synthesized through a co-precipitation procedure: the coating of Fe 3 O 4 NPs with APTES followed by the reaction of 5-bromosalicylaldehyde with amino groups led to a 5-bromosalicylaldehyde Schiff base supported on Fe 3 O 4 NPs (Schiff-base@MNPs) for the formation of a complex with palladium. The resulting Schiff-base-Pd@MNPs catalyst was composed of quite homogeneous and quasi-spherical particles with an average diameter of about 10 nm ( Figure 17 ) [ 49 ].…”

Oxo‐vanadium(IV) unsymmetrical Schiff base complex immobilized on γ‐Fe2O3 nanoparticles: A novel and magnetically recoverable nanocatalyst for selective oxidation of sulfides and oxidative coupling of thiols

“…Nowadays, nanoparticles, specially magnetic nanoparticles (MNPs), are employed as catalyst supports because of their unique properties, including ease of separation by a magnet, high surface area, high dispersion, low toxicity, appropriate recycling of catalyst, and remarkable stability. [ 22–26 ] Whereas most heterogeneous systems require filtration, centrifugation, or tiresome workup to recover the catalysts from the final reaction, the magnetic nanocatalysts can be magnetically separated from the reaction medium with no need for filtration or centrifugation steps. Furthermore, the MNPs can be prepared from inexpensive materials and can be simply modified through appropriate surface modifications.…”