Graphene oxide immobilized Cu(II) Schiff base complex, GO@AF‐SB−Cu, was synthesized by the reaction of a Schiff base functionalized Graphene oxide, GO@AF‐SB, with Cu(OAc)2.H2O in ethanol under reflux. The immobilized complex was isolated as a black‐coloured solid and characterized by various physico‐chemical techniques, such as Fourier transform infrared spectroscopy (FT‐IR), Fourier transform Raman spectroscopy (FT‐Raman), Powder X‐ray diffraction (PXRD), X‐ray photoelectron spectroscopy (XPS), Field emission scanning electron microscopy (FESEM), Energy dispersive X‐ray microscopy (EDX), Elemental mapping, Inductively coupled plasma atomic emission spectroscopy (ICP‐AES) and Thermo gravimetric analysis (TGA). The catalytic activity of the complex was explored in Chan‐Lam coupling reaction of amines and arylboronic acids without using any co‐catalyst or oxidant. Further, the catalyst could be easily recovered quantitatively from the reaction mixture by simple filtration and reused up to five times without significant loss in the catalytic activity. All the isolated organic products were characterized by 1H and 13C NMR spectroscopy.
A new composite,
cucurbit[6]uril (CB[6])-supported magnetic nanoparticles,
Fe
3
O
4
–CB[6], was synthesized via a co-precipitation
method in air and fully characterized by Fourier transform infrared
spectroscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy,
field-emission scanning electron microscopy, high-resolution transmission
electron microscopy, energy-dispersive X-ray spectroscopy, thermogravimetric
analysis, inductively coupled plasma–mass spectrometry, and
vibrating sample magnetometry techniques. It has been found to be
a highly efficient, economic, and sustainable heterogeneous catalyst
and has been employed for the first time for the synthesis of a series
of biologically important 2-substituted benzimidazoles from various
benzyl alcohols and 1,2-diaminobenzenes under solvent-free conditions
via acceptorless dehydrogenative coupling to afford the corresponding
products in good to excellent yields (68–94%). The magnetic
nature of the nanocomposite facilitates the facile recovery of the
catalyst from the reaction mixture by an external magnet. The catalyst
can be reused up to five times with negligible loss in its catalytic
activity. All the isolated products were characterized by
1
H and
13
C{
1
H} NMR spectroscopy.
Fine nanoparticles of CuO, generated in-situ by the chemical reduction method, were immobilized on cucurbit[6]uril support to afford nanocomposite CuO@CB [6] as an air-stable green powder. The nanocomposite was fully characterized by various physicochemical techniques, such as FTIR, PXRD, XPS, FESEM, EDX, Elemental mapping, HRTEM, TGA, and ICP-AES. It has been found to be an efficient heterogeneous nanocatalyst for the synthesis of a series of 2H-indazoles from aldehyde, amine, and azide, under base-and ligand-free conditions, at a low concentration of the metal (0.2 mole %). The augmented catalytic activity of the CuO NPs is attributed to the fine size of the nanoparticles. The nanocatalyst was retrieved from the reaction mixture by simple filtration and reused up to five times with insignificant deprivation in its catalytic activity. All synthesized 2H-indazoles were isolated in good to excellent yield (55-96%) and characterized by 1 H and 13 C NMR studies. Three new indazoles are additionally characterized by DEPT 135 spectroscopy and HRMS spectra.
A new nanocomposite of β-Ni(OH)2 nanoparticles immobilized on cucurbit[6]uril, β- Ni(OH)2-CB[6], was designed and characterized using several physicochemical techniques, viz FTIR, PXRD, XPS, FESEM, HRTEM, EDAX, TGA, and ICP-OES. The...
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