Crystal Growth & Design,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 8, 2024
Considering
that
the
greenhouse
effect
is
most
concerning
environmental
issue
globally,
selective
capture
and
resource
utilization
of
CO2
have
attracted
widespread
attention.
Herein,
we
report
a
highly
robust
thulium(III)–organic
framework
{[Tm2(μ2-OH)(CPPDDA)(H2O)2]·3DMF·2H2O}n
(NUC-108),
which
obtained
from
exquisite
combination
undocumented
multifunctional
clusters
[Tm4(μ2-OH)2(COO)10(H2O)4]
organic
ligands
4,4′-(4-(4-carboxyphenyl)pyridine-2,6-diyl)diisophthalic
acid
(H5CPPDDA).
NUC-108
possesses
following
unique
merits:
(i)
functional
tetranuclear
rare-earth
serve
as
nodes,
in
Tm3+
ions
can
be
activated
Lewis
sites
μ2-OH
anions
are
base
sites;
(ii)
high-porosity
zeolite
architecture
contains
three
kinds
channels:
12.29
×
9.74
Å2
8.92
4.97
along
b
axis
12.76
8.95
c
axis;
(iii)
uncoordinated
pyridine
moieties
further
endow
host
with
functionality;
(iv)
resistance
to
weak
acidic
alkaline
aqueous
solutions
well
various
solvents.
Notably,
NUC-108a
effectively
separate
binary
CO2/CH4
mixture
high
adsorption
selectivity,
should
due
enough
basic
groups
moieties.
Furthermore,
under
mild
conditions
without
any
solvent,
also
used
an
effective
recoverable
catalyst
facilitate
cycloaddition
epoxides
aid
tetrabutylammonium
bromide.
Hence,
these
findings
beneficial
for
guiding
development
stable
active
catalysts
carbon
utilization.
Langmuir,
Год журнала:
2024,
Номер
40(26), С. 13397 - 13411
Опубликована: Июнь 20, 2024
Herein,
we
present
a
highly
efficient
dual-functionalized
acid–base
nanocatalyst,
denoted
as
Fe3O4@GLYMO-HEPES,
featuring
sulfuric
acid
and
tertiary
amines
its
dual
functional
components.
This
catalyst
is
synthesized
through
the
immobilization
of
4-(2-hydroxyethyl)-1-piperazineethanesulfonic
(HEPES)
source
these
functionalities
onto
magnetite
(Fe3O4)
using
3-glycidoxypropyltriethoxysilane
(GLYMO)
linker.
Characterization
studies
confirm
integrity
Fe3O4
core,
with
GLYMO-HEPES
coating
exhibiting
no
phase
changes.
Furthermore,
Fe3O4@GLYMO-HEPES
nanoparticles
demonstrate
uniform
size
distribution
without
aggregation.
Notably,
exhibits
remarkable
stability
up
to
200
°C
possesses
saturation
magnetization
value
31.5
emu/g,
facilitating
easy
recovery
via
magnetic
separation.
These
findings
underscore
potential
versatile
recyclable
nanocatalyst
for
various
applications.
Its
catalytic
ability
was
evaluated
in
synthesis
pyrano[2,3-c]pyrazoles
2-amino-3-cyano-4H-chromenes
tandem
Knorr–Knoevenagel–Michael–Thorpe–Ziegler-type
heterocyclization
mechanism,
different
aldehydes.
A
wide
range
fused
heterocycles
having
good
excellent
yields.
The
process
cost-effective,
safe,
sustainable,
scalable,
can
be
reused
five
times.
prepared
found
stable
heterogeneous
showed
recyclability.
Crystal Growth & Design,
Год журнала:
2024,
Номер
24(8), С. 3473 - 3482
Опубликована: Апрель 8, 2024
Adjusting
the
Lewis
acid–base
sites
in
MOF-based
catalysts
to
meet
demand
for
catalytic
CO2
chemical
fixation
is
a
huge
challenge.
Herein,
highly
robust
rectilinear
{Zn3}-based
metal–organic
framework
of
{[Zn3(TNTNB)2(4,4′-bip)(H2O)2]·5DMF·9H2O}n
(NUC-80)
was
generalized
from
solvothermal
condition
(H3TNTNB
=
1,3,5-tri(3-nitro-4-carboxyphenyl)-2,4,6-trinitrobenzene,
4,4′-bip
4,4′-bipyridine).
Activated
NUC-80a
not
only
owns
large
void
volume
(58%)
and
two
kinds
solvent-accessible
channels:
rhombic-like
(ca.
14.24
×
14.57
Å)
along
axis
rectangular-like
11.72
14.48
b
axis,
but
also
functionalized
by
rich
metal
plentiful
nitro
groups
on
its
inner
surface.
Performed
experiments
confirmed
that
could
efficiently
catalyze
cycloaddition
reaction
with
epoxides
Knoevenagel
condensations
aldehydes
malononitrile
under
mild
conditions
high
turnover
frequency
(TOF).
Hence,
this
work
provides
nitro-functionalized
cluster-based
nanoporous
wide
range
potential
applications
such
as
catalysis,
gas
adsorption,
separation.
Nanoscale Advances,
Год журнала:
2024,
Номер
6(12), С. 3158 - 3168
Опубликована: Янв. 1, 2024
In
this
research,
a
heterogeneous
acid
catalyst
was
synthesized
by
room
temperature
encapsulation
of
phosphomolybdic
(PMA)
in
the
pores
MIL-53
(Fe)
metal
organic
framework
(MOF)
under
ultrasonic
conditions.
