Nanoscale Advances,
Journal Year:
2023,
Volume and Issue:
5(23), P. 6594 - 6605
Published: Jan. 1, 2023
In
this
research,
a
novel
nanomagnetic
tetra-azamacrocyclic
Schiff
base
complex
of
copper(ii)
was
produced
via
post-synthetic
surface
modification
an
Fe3O4
by
silane-coupling
agent
that
contains
acetylacetone
functionalities
at
the
end
its
chain.
Moreover,
target
Cu
involves
tetradentate
ligand
obtained
from
template
reaction
with
o-phenylenediamine
and
Cu(NO3)2·3H2O.
Furthermore,
prepared
nominated
as
[Fe3O4@TAM-Schiff-base-Cu(II)].
The
Fourier-transform
infrared
(FT-IR)
analysis
indicates
presence
Schiff-base-Cu
in
catalyst.
X-ray
spectroscopy
(EDS)
TGA
reveal
approximately
6-7%
catalyst
comprises
hydrocarbon
moieties.
scanning
electron
microscope
(SEM)
transmission
microscopy
(TEM)
images
demonstrate
uniformly
shaped
particles,
nearly
spherical
nature,
sizes
ranging
9
to
18
nm.
[Fe3O4@TAM-Schiff-base-Cu(II)]
applied
for
click
synthesis
diverse
range
5-substituted-1H-tetrazoles
PEG-400
green
medium.
Regarding
electrical
properties
Cu(ii)
complex,
tetra-aza
(N4
donor)
macrocyclic
N-rich
reasonable
-
leading
excellent
capacity
catalyze
these
organic
transformations.
Finally,
high
magnetization
value
(44.92
emu
g-1)
enables
recycling
least
four
times
without
compromising
catalytic
efficiency.
Current Organic Chemistry,
Journal Year:
2024,
Volume and Issue:
28(10), P. 777 - 788
Published: March 19, 2024
Abstract:
In
this
study,
magnetic
hercynite
nanoparticles
(FeAl2O4,
MNPs)
were
functionalized
by
cheap
and
readily
available
tris(hydroxymethyl)aminomethane
(Tris)
as
an
organocatalyst.
Various
techniques,
including
Vibrating
Sample
Magnetometry
(VSM),
Energy
Dispersive
X-ray
Spectroscopy
(EDS),
Diffraction
(XRD),
Scanning
Electron
Microscopy
(SEM),
Thermogravimetric
Analysis
(TG)
employed
to
determine
the
morphology,
particle
size,
physical
properties,
properties
of
nanoparticles.
Additionally,
Fourier
transform
infrared
spectroscopy
(FT-IR)
techniques
used
investigate
presence
functional
group.
The
activity
new
catalyst
a
magnetically
recoverable
nanocatalyst
was
investigated
in
synthesis
oxygen
nitrogencontaining
heterocyclic
compounds.
Pyranoprazole
2-amino-4H-benzo[b]pyrans
compounds
synthesized
with
high
efficiency
short
time.
FeAl2O4@SiO2@Tris
can
be
separated
using
attraction
reused
up
5
consecutive
times
without
significant
decrease
yield
target
products
or
catalytic
activity.
Applied Organometallic Chemistry,
Journal Year:
2020,
Volume and Issue:
34(4)
Published: Jan. 21, 2020
In
this
work,
we
present
a
simple,
environmentally‐friendly
and
economical
route
for
the
preparation
of
novel
lanthanum
(III)
organometallic
complex
immobilized
onto
highly
stable
mesoporous
silica
SBA‐15
(La‐guanine@SBA‐15)
using
an
inexpensive
simple
method
available
materials.
This
heterogenized
was
comprehensively
characterized
FT‐IR,
XRD,
EDS,
ICP,
MAP,
SEM,
TGA
BET
techniques.
The
catalytic
activity
material
studied
in
one‐pot
multi‐component
tandem
Knoevenagel
condensation–Michael
addition–cyclization
reactions
order
to
prepare
series
benzo
[a]
pyrano
[2,
3‐c]
phenazine
4,4′‐(arylmethylene)‐bis‐(3‐methyl‐1‐phenyl‐1H‐pyrazol‐5‐ols)
derivatives
under
green
conditions.
catalyst
exhibited
recoverable
recyclable
features
consecutive
reaction
runs.
Besides,
products
were
obtained
high
yields
short
times.
sense,
from
commercially
materials,
operation,
activity,
times,
use
conditions
mentioned
organic
synthesis
are
most
significant
advantages
protocol.
addition,
nanocatalyst
easily
recovered,
filtration,
reused
several
times
without
loss
its
efficiency.
Moreover,
leaching,
heterogeneity
stability
La‐guanine@SBA‐15
by
hot
filtration
test
ICP
technique.
Finally,
after
recycling
confirmed
SEM
FT‐IR
Applied Organometallic Chemistry,
Journal Year:
2020,
Volume and Issue:
34(6)
Published: March 19, 2020
In
this
research,
a
rapid,
green
and
efficient
protocol
for
synthesis
of
bis
(pyrazolyl)methane
derivatives
in
the
presence
Pd(0)‐guanidine@MCM‐41
catalysts
under
solvent‐free
conditions
by
following
two
methods
has
been
reported:
(i)
via
one‐pot
pseudo
five‐component
reaction
among
phenylhydrazine
(2
equivalents),
ethyl
acetoacetate
equivalents)
aromatic
aldehydes
(1
equivalent);
(ii)
three‐component
between
3‐methyl‐1‐phenyl‐1H‐pyrazol‐5(4H)‐one
equivalent).
Some
advantages
include:
conditions,
extremely
short
times,
high
efficiency,
proper
operation,
generality
method,
easy
work‐up
recyclability,
reusability
catalyst
up
to
five
times
without
significant
loss
catalytic
activity.
Scientific Reports,
Journal Year:
2021,
Volume and Issue:
11(1)
Published: Aug. 2, 2021
Abstract
A
highly
efficient
and
stable
heterogeneous
coordination
polymer
(CP)
was
successfully
prepared
by
hydrothermal
combination
of
silver
4,6-diamino-2-pyrimidinethiol.
The
characterized
FT-IR,
XRD,
TGA,
SEM,
EDX,
X-ray
mapping
Nitrogen
adsorption–desorption
analysis.
Ag–CP
exhibit
excellent
catalytic
activity
in
multicomponent
Hantzsch
synthesis
polyhydroquinolines
under
mild
reaction
conditions
relatively
short
times.
heterogeneity
the
catalyst
confirmed
hot
filtration
test;
also,
reused
for
at
least
four
times
optimized
without
any
significant
loss
its
activity.
