Water-dispersible and magnetically separable gold nanoparticles supported on a magnetite/s-graphene nanocomposite and their catalytic application in the Ullmann coupling of aryl iodides in aqueous media

Abstract

The water-dispersible and magnetic separable Au/Fe3O4/s-G nanocomposite was used as an effective and reusable heterogeneous catalyst for the Ullmann homocoupling.

Palladium nanoparticle‐decorated magnetic pomegranate peel‐derived porous carbon nanocomposite as an excellent catalyst for Suzuki–Miyaura and Sonogashira cross‐coupling reactions

“…The second component, located at 337.6 and 342.7 eV, is attributable to Pd 2+ 3d 5/2 and Pd 2+ 3d 3/2 , respectively, which may be ascribed to the oxidation of surface atoms exposed to air . The core‐level region of Fe 2p is shown in Figure (c), where the peaks at 725.4 and 711.6 eV are assignable to Fe 2p 1/2 and Fe 2p 3/2 for Fe 3 O 4 , respectively . The Pd content of the sample was also determined using flame atomic absorption spectroscopy (FAAS) as 0.28 mmol g −1 .…”

“…In addition, Fe 3 O 4 has already been introduced as a suitable support for the preparation of highly active metal catalysts, and immobilizing noble metal nanocatalysts on magnetic Fe 3 O 4 support prevents agglomeration of the catalyst particles during recovery and can increasing catalyst durability. Thus, a combination of Fe 3 O 4 nanoparticles and AC may optimize both dispersion and catalytic activity of metal nanoparticles …”

Fe3O4@RGO@Au@C Composite with Magnetic Core and Au Enwrapped in Double-Shelled Carbon: An Excellent Catalyst in the Reduction of Nitroarenes and Suzuki–Miyaura Cross-Coupling

“…Recently, much attention has been paid on the synthesis of Fe 3 O 4 NPs/graphene as a new kind of hybrid material, owing to wide-ranging applications such as immobilizing bioactive substances, energy storage and environmental remediation [4][5][6]. The unique properties of Fe 3 O 4 NPs/graphene hybrids, combining characteristics of graphene as a polycyclic aromatic molecule, which has high conductivity, low price, high chemical inertness, and large specific surface area [7][8][9], and Fe 3 O 4 NPs, with high magnetism, low-cost, and environmentally benign nature [10][11][12][13][14], open a new window for fabricating most stable multifunctional nanomaterials using these hybrids as support materials.…”

Recent advancement of Ullmann-type coupling reactions in the formation of C–C bond

“…In 2014, Dabiri and co-workers demonstrated that a gold nanoparticle supported on a magnetic/s-graphene nanocomposite (Au/Fe 3 O 4 /s-G) is a highly water-dispersible/magnetically separable semi heterogeneous catalyst for Ullmann homocoupling of aryl iodides in water [37].…”