Magnetite (Fe3O4) silica based organic–inorganic hybrid copper(ii) nanocatalyst: a platform for aerobic N-alkylation of amines

Abstract

A magnetically recoverable, efficient and selective copper based nanocatalyst has been synthesised via covalent grafting of 2-acetylthiophene on a silica coated magnetic nanosupport followed by metallation with copper acetate. The obtained organic-inorganic hybrid nanomaterial has been characterized by electron microscopy techniques (SEM and TEM with EDS), XRD, VSM, FT-IR and AAS. The catalytic performance of the novel nano-catalyst is evaluated in the active transformation of various aromatic amines to industrially-important alkylated amines. The nanocomposites afford high turnover frequency and high selectivity for amines under aerobic conditions. Furthermore, the heterogeneous nature of the catalyst allows easy magnetic recovery and regeneration, which makes the present protocol highly beneficial to address the industrial needs and environmental concerns. † Electronic supplementary information (ESI) available. See

Cu(II) Schiff base complex supported on Fe3O4 nanoparticles as an efficient nanocatalyst for the selective aerobic oxidation of alcohols

“…19–0629) with an inverse cubic spinal structure without any impurity. Also, the broad peak at 2 θ from 20° to 24° indicates the existence of amorphous silica layer (Figure b) . A comparison between the XRD patterns of Fe 3 O 4 versus the nanocatalyst shows that the pattern of immobilized Schiff base complex includes six peaks related to Fe 3 O 4 nanoparticles with reduced intensity and a broadening of the Bragg peaks (Figure c).…”

“…The magnetic support offers high catalytic efficiency and better recovery without having the intrinsic obstacles of leaching during the reaction. Thus to date, a number of reports have been published on the use of Cu(II) Schiff base complexes supported on functionalized Fe 3 O 4 nanoparticles as heterogeneous nanocatalysts for various organic transformations …”

Synthesis and surface modification of magnetic nanoparticles for potential applications in sarcomas

“…As it is shown, in silicacoated IONPs FT-IR pattern, peaks related to carboxyl-functionalized EG and OH disappeared and new characteristic peaks in 789, 950, and 1051 cm -1 appeared which are related to symmetric vibration of Si-O-Si, Si-O vibration, and asymmetric stretching vibration of Si-O-Si, respectively. Another new peak in 1623 cm -1 was observed which could present scissoring vibration of NH 2 , which represents that ammonia not only was a catalytic agent, but could also cause create NH 2 -functionalized silica-coated IONPs (Socrates 2004;Sharma et al 2013;Chen et al 2014). DG-coated IONPs unique broad OH peak was observed in 3381 cm -1 which corresponds to several OH groups in DG molecular structure.…”

A one‐pot green synthesis of 2‐amino‐4H‐benzo[h]chromenes catalyzed by a dioxomolybdenum Schiff base complex supported on magnetic nanoparticles as an efficient and recyclable nanocatalyst

“…Nowadays, immobilization of the homogeneous metal complex on the surface of magnetic nanoparticles is considered as an unbeatable pathway in the field of nanocatalysis due to the major advantages such as high stability, easy isolation, and recovery of the catalyst from reaction media by an external magnet for reuse, and more catalytic active centers . In fact, such magnetic nanocatalysts can effectively create a bridge between homogeneous and heterogeneous catalysis.…”