Macromolecular Rapid Communications,
Journal Year:
2023,
Volume and Issue:
44(19)
Published: July 20, 2023
Abstract
Regulating
of
pore
environment
is
an
efficient
way
to
improve
the
performance
covalent
organic
frameworks
(COFs)
for
specific
application
requirements.
Herein,
design
and
synthesis
two
pyrene‐based
2D
COFs
with
‐H
or
‐Me
substituents,
TFFPy‐PPD‐COF
TFFPy‐TMPD‐COF
are
reported.
Both
them
show
long
order
structure
high
porosity,
in
which
displays
a
larger
volume
bigger
BET
surface
area
(2587
m
2
g
−1
,
1.17
cm
3
).
Interestingly,
TFPPy‐TMPD‐COF
exhibits
much
higher
vapor
iodine
capacity
(4.8
)
than
TFPPy‐PPD‐COF
(2.9
),
contrast
their
size.
By
using
multiple
techniques,
better
capture
ascribed
altered
by
introducing
methyl
groups,
contributes
formation
polyiodide
anions
enhances
interactions
between
iodine.
These
results
will
be
helpful
understanding
effect
uptake
constructing
novel
performance.
Small,
Journal Year:
2023,
Volume and Issue:
19(34)
Published: May 10, 2023
In
order
to
overcome
the
limitations
of
supramolecular
organic
cages
for
their
incomplete
accessibility
active
sites
in
solid
state
and
uneasy
recyclability
liquid
solution,
herein
a
nitrogen-rich
cage
is
rationally
linked
into
framework
systems
four
isoreticular
covalent
frameworks
(COFs),
that
is,
Cage-TFB-COF,
Cage-NTBA-COF,
Cage-TFPB-COF,
Cage-TFPT-COF,
are
successfully
synthesized.
Structure
determination
reveals
they
all
high-quality
crystalline
materials
derived
from
eclipsed
packing
related
two-dimensional
frameworks.
Since
usually
have
high
affinity
toward
iodine
species,
adsorption
investigations
carried
out
results
show
them
display
an
enhancement
capacities.
Especially,
Cage-NTBA-COF
exhibits
capacity
304
wt%,
14-fold
higher
than
sample
packed
itself.
The
strong
interactions
between
adsorbed
species
revealed
by
spectral
analyses.
This
work
demonstrates
that,
utilizing
reticular
chemistry
strategy
extend
close-packed
porous
solids,
inherent
properties
can
be
greatly
exploited
targeted
applications.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Feb. 10, 2024
Abstract
Developing
heterogeneous
photocatalysts
for
the
applications
in
harsh
conditions
is
of
high
importance
but
challenging.
Herein,
by
converting
imine
linkages
into
quinoline
groups
triphenylamine
incorporated
covalent
organic
frameworks
(COFs),
two
photosensitive
COFs,
namely
TFPA-TAPT-COF-Q
and
TFPA-TPB-COF-Q,
are
successfully
constructed.
The
obtained
quinoline-linked
COFs
display
improved
stability
photocatalytic
activity,
making
them
suitable
reactions
under
conditions,
as
verified
recyclable
acid
involving
oxidative
decarboxylation
base
benzylamine
coupling.
Under
strong
condition,
show
a
efficiency
up
to
11831.6
μmol·g
−1
·h
long-term
usability
production
H
2
O
,
while
pristine
imine-linked
less
catalytically
active
easily
decomposed
these
conditions.
results
demonstrate
that
enhancing
linkage
robustness
photoactive
promising
strategy
construct
catalysts
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(31)
Published: May 14, 2024
Hydrazone-linked
covalent
organic
frameworks
(COFs)
with
structural
flexibility,
heteroatomic
sites,
post-modification
ability
and
high
hydrolytic
stability
have
attracted
great
attention
from
scientific
community.
COFs,
as
a
subclass
of
Schiff-base
was
firstly
reported
in
2011
by
Yaghi's
group
later
witnessed
prosperous
development
various
aspects.
Their
adjustable
structures,
precise
pore
channels
plentiful
sites
hydrazone-linked
structures
possess
much
potential
diverse
applications,
for
example,
adsorption/separation,
chemical
sensing,
catalysis
energy
storage,
etc.
Up
to
date,
the
systematic
reviews
about
COFs
are
still
rare.
Therefore,
this
review,
we
will
summarize
their
preparation
methods,
characteristics
related
discuss
opportunity
or
challenge
COFs.
We
hope
review
could
provide
new
insights
exploring
more
appealing
functions
applications.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(17), P. 10539 - 10553
Published: Jan. 1, 2024
The
effective
containment
and
storage
of
iodine
is
important,
fulfilling
both
the
roles
managing
nuclear
waste
ensuring
safe
utilization
radioactive
isotopes
in
medicine.
ACS Applied Nano Materials,
Journal Year:
2023,
Volume and Issue:
6(19), P. 18177 - 18187
Published: Sept. 26, 2023
With
the
rapid
development
of
nuclear
industry,
effective
treatment
radioactive
iodine
has
become
an
urgent
and
challenging
task.
In
this
article,
we
synthesized
a
nanoporous
nitrogen-rich
covalent
organic
framework
(TTA-DMTP-COF)
with
specific
surface
area
up
to
2332
m2/g
for
adsorption
(I2)
methyl
iodide
(CH3I).
Adsorption
experiments
showed
that
TTA-DMTP-COF
exhibited
I2
CH3I
properties;
maximum
capacity
is
as
high
2.59
g·g–1,
1.60
g·g–1.
addition,
can
effectively
adsorb
from
iodine–cyclohexane
solution,
amount
516.46
mg/g.
Mechanistic
studies
have
shown
enter
nanopores
COF
materials
form
charge
transfer
complexes
various
functional
groups
in
(including
imines,
triazine
moieties,
residual
amino
groups).
The
N-methylation
reaction
specifically
binds
nucleophilic
N
site
generates
polyiodides
during
process.
Our
work
demonstrates
excellent
candidate
material
capable
capturing
air
solution
harsh
environments.
Three
novel
conjugated
porous
organic
polymers,
denoted
as
C-POP1–3
and
which
consist
of
alternating
pyrene
cores
with
various
contorted
fluorene
surrogates,
were
successfully
synthesized
from
a
versatile
one-pot
palladium-catalyzed
[3+2]
cyclocondensation
reaction.
The
resulting
polymers
obtained
in
excellent
yields
displayed
weight-average
molecular
weights
(Mw)
ranging
12.2
to
20.2
kg/mol
polydispersity
indices
(Mw/Mn)
between
1.8
2.4,
suggesting
that
the
masses
are
narrowly
distributed
thus
implying
homogeneous
polymer
chains.
Thermal
stability
exploration
by
thermogravimetric
analysis
(TGA)
revealed
an
impressive
robustness
10%
weight
reduction
temperature
attaining
485
°C.
Investigation
inherent
microporosity
properties
via
nitrogen
adsorption
experiments
using
Brunauer–Emmett–Teller
(BET)
theory
discloses
their
surface
areas
reach
up
560
m2
g–1
pore
volumes
averaging
0.47
cm3
g–1.
target
explored
adsorbents
disclosing
maximum
carbon
dioxide
83.0
mg
at
273
K
low
pressure
for
C-POP1,
whereas
iodine
sorption
tests
portrayed
prominent
outcomes,
notably
C-POP3
proved
owe
strong
affinity
toward
hitherto
mentioned
halogen
achieving
2220
Additionally,
recyclability
confirmed
possibility
regenerate
polymers'
capabilities
even
after
seven
consecutive
cycles
adsorption–desorption
cycles,
qualify
them
auspicious
adsorbents.
