A novel and sustainable bimetallic nanocatalyst has been developed and utilized for the efficient oxidative degradation of water pollutants (2,4-D and MO) under ambient reaction conditions.
With the advancements in materials engineering, unprecedented newer materials based on magnetic MOFs have become a leitmotiv in the strategic field of catalysis. Within this perspective, the present report unveils...
In
this work, pharmaceutically and biologically important compounds
containing imidazo[1,5-
a
]pyridine nuclei have been
synthesized via transannulation of N-heteroaryl aldehydes or ketones
with alkylamines using a graphene oxide-supported copper catalyst.
The nanocatalyst was fabricated by the covalent immobilization of
4-aminoantipyrine onto an amine-functionalized graphene oxide nanosupport
followed by its metallation with copper acetate. Structural analysis
by transmission electron microscopy, scanning electron microscopy,
X-ray photoelectron spectroscopy (XPS), and X-ray diffraction demonstrates
that the two-dimensional sheet-like structure of graphene oxide is
maintained even after the chemical modifications, whereas XPS revealed
crucial information related to elemental composition and surface electronic
states of the metal present in the catalyst. Apart from this, Fourier
transform infrared spectroscopy helped in identifying the degree of
oxidation and the presence of oxygenated groups in graphene oxide
nanocomposites. As a heterogeneous catalyst, this graphene oxide-supported
copper complex showed moderate to good catalytic activity in the C(sp
3
)–H bond activation/amination of a variety of substrates.
This superior catalytic performance originated from the unique 2-dimensional
structure of graphene oxide-based material which provided space between
graphitic overlayers due to appropriate positioning of metal on their
basal planes, decreasing the diffusion resistances of reactant surfaces,
thus making it function as a nanoreactor. More importantly, this nanomaterial
could be recovered easily and reused repeatedly by simple washing
without chemical treatment with no appreciable loss in its catalytic
activity, showing good potential for increasing the overall turnover
number of this synthetically useful catalyst.
Atomically thin two-dimensional boron nitride nanosheets have spawned futuristic advancements in the arena of nanocatalysis research through their intriguing capability to act as exceptional support matrixes. Motivated by their phenomenal attributes, we have fabricated a magnetic boron nitride nanosheet-based cobalt catalytic system wherein boron nitride nanosheets are initially integrated with magnetic Fe 3 O 4 nanoparticles (NPs), and the resulting nanostructure is further surface-engineered with cobalt NPs to yield an h-BN/Fe 3 O 4 /Co hybrid. For gaining an insight into their structural and morphological features, reliable spectroscopic and microscopic characterization techniques including TEM, SEM, XRD, FT-IR, VSM, ED-XRF, XPS, BET, TGA, and AAS were employed. The developed nanohybrid material was then utilized to provide ready access to a library of highly bioactive 3,4-dihydropyrimidin-2(1H)-ones/thiones under ambient conditions. A plausible mechanistic route for furnishing 3,4dihydropyrimidin-2(1H)-ones catalyzed by h-BN/Fe 3 O 4 /Co has also been delineated. Ambient reaction conditions, solvent-free conditions, high product yield, and excellent thermal and mechanical stability of the catalyst along with facile magnetic retrievability and efficient recyclability are some of the phenomenal characteristics of this methodology. The present protocol besides exhibiting a wider functional group tolerance and a high turnover number was devoid of any additive, thus making it superior to literature precedents reported to date. In consideration of the striking catalytic activity of the h-BN/Fe 3 O 4 /Co nanomaterial, it can be anticipated that the present catalyst can not only possess a stupendous potential to expedite substantial manufacturing of other industrially demanding organic motifs but may also unlock insights for designing next-generation 2D catalytic materials.
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