Copper(ii) ions supported on functionalized graphene oxide: an organometallic nanocatalyst for oxidative amination of azoles via C–H/C–N bond activation

Abstract

Graphene oxide (GO) was chemically modified with para-aminobenzoic acid (PABA) to immobilize copper(ii) ions on its surface and used as a nanocatalyst for the oxidative C (sp2)–H bond amination reaction.

Robust Self-Healing Graphene Oxide-Based Superhydrophobic Coatings for Efficient Corrosion Protection of Magnesium Alloys

“…The XRD pattern of GO showed a wide peak at 2θ = 10.2° corresponding to the (001) crystalline plane, indicating that GO was synthesized successfully . According to the Bragg equation, the d -spacing of GO was 0.78 nm, which was much larger than 0.34 nm of graphene . In fact, the increase in the d -spacing of the GO was due to the appearance of different oxygen-containing functional groups .…”

“…33 According to the Bragg equation, the d-spacing of GO was 0.78 nm, which was much larger than 0.34 nm of graphene. 34 In fact, the increase in the d-spacing of the GO was due to the appearance of different oxygencontaining functional groups. 35 For GO-Cu 2+ , a new sharp diffraction peak appeared at 2θ = 23.2°due to the formation of Cu(OH) 2 , which was attributed to the covalent chelation of Cu 2+ with the carboxyl group on the GO surface.…”

Impact of Polyethylene Glycol Functionalization of Graphene Oxide on Anticoagulation and Haemolytic Properties of Human Blood

“…However, PEGylation altered GO's morphology, by folding GO's sheets and by the formation of wrinkles probably due to the spatial interactions between the PEG molecules grafted onto the edges of the GO layers. Other previous studies have also been reported on a more layered and folded morphology of GO after functionalization [49,50]. Raman spectroscopy was further used for studying graphene structural changes upon functionalization [51].…”

Nanostructured Ni(OH)2–ZnO mixed crystals as recyclable catalysts for the synthesis of N-unsubstituted 1,2,3-triazoles

“…Nanostructured materials have been harnessed in an array of revolutionary applications 1 as an alternative to traditional catalysts in a greener and more sustainable way, mainly due to their incredible surface-areas 2 and tremendous mechanical 3 and catalytic 4 properties. In addition, good selectivity, high stability and recyclability have manifested these materials to be involved as a potent applicant in various organic reactions such as chemo-selective oxidation, 5 oxidative amination, 6 ipso hydroxylation 7 and many more. [8][9][10] The enormous applicability of nanomaterials has encouraged us to incorporate them into the synthesis of a biologically active heterocyclic scaffold, NH-1,2,3-triazole, using a greener approach.…”