Covalent
organic
frameworks
(COFs)
are
a
class
of
porous
materials
with
exceptional
crystallinity,
porosity,
and
well-defined
structure,
which
crucial
for
detection
removal
applications.
In
this
study,
we
report
the
synthesis
emissive
stable
COFs
via
Schiff
base
condensation
reaction.
The
stability,
emission
properties
TT-COFs
attributed
to
intramolecular
hydrogen
bonding
between
OH
units
imine
bonds.
Through
π–π
stacking
interactions
adsorbed
bisphenol
molecules
COF
host,
demonstrate
sensitivity
selectivity
toward
A
(BPA)
in
water,
achieving
lower
limit
through
quenching
placing
them
among
best-reported
sensor
systems.
Additionally,
exhibit
rapid
adsorption
BPA
high
performance
(548
mg
g–1)
at
room
temperature,
along
efficient
sustained
cyclic
capability
without
significant
efficiency
loss.
This
research
represents
advancement
COF-based
approaches
substance
water
treatment.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(45)
Published: July 18, 2024
Abstract
Helicenes
represent
a
class
of
fascinating
π
compounds
with
fused
yet
folded
backbones.
Despite
their
broad
structural
diversity,
harnessing
helicenes
to
develop
well‐defined
materials
is
still
formidable
challenge.
Here
we
report
the
synthesis
crystalline
porous
helicene
by
exploring
synthesize
covalent
2D
lattices
and
layered
frameworks.
Topology‐directed
polymerization
[6]helicenes
porphyrin
creates
networks
alternate
helicene‐porphyrin
alignment
along
x
y
directions
at
1.5‐nm
interval
develops
[6]helicene
frameworks
through
reversed
anti‐AA
stack
z
direction
form
segregated
columnar
arrays.
Notably,
this
configuration
enables
be
highly
red
luminescent
benchmark
quantum
yields.
The
trigger
effieicnt
intra‐framework
singlet‐to‐singlet
state
energy
transfer
from
facilitate
intermolecular
triplet‐to‐triplet
molecular
oxygen
produce
reactive
species,
harvesting
wide
range
photons
ultraviolet
near‐infrared
regions
for
light
emitting
photo‐to‐chemical
conversion.
This
study
introduces
new
family
extended
frameworks,
laying
groundwork
unprecedented
structures
functions.
ACS Applied Polymer Materials,
Journal Year:
2024,
Volume and Issue:
6(14), P. 8498 - 8504
Published: July 4, 2024
Creating
highly
emissive
covalent
organic
frameworks
(COFs)
has
traditionally
been
difficult,
owing
to
strong
π–π
interactions
between
adjacent
layers,
resulting
in
aggregation-caused
quenching
properties.
In
this
article,
we
report
the
use
of
a
vertex
strategy
create
COFs
with
enhanced
fluorescence
performances.
This
involved
introducing
different
units
into
COF
structure.
These
including
N
atoms
possessed
p
orbital
lone
pairs
electrons,
which
formed
p−π
conjugation
linkages
and
walls
COFs.
The
from
effectively
suppressed
effect
COFs,
leading
development
emission
designed
were
evaluated
for
their
ability
detect
2,4,6-trinitrophenol,
specific
type
nitro-explosive,
water.
demonstrated
high
sensitivity
selectivity
2,4,6-trinitrophenol
detection
compared
other
nitro-explosives.
summary,
controllable
is
promising
method
designing
enhancing
properties,
paving
way
luminescent
materials
diverse
applications.
Macromolecular Rapid Communications,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 28, 2024
Abstract
2D
covalent
organic
frameworks
(COFs)
are
attractive
for
fluorescence
sensing
due
to
their
lightweight,
robust,
and
highly
ordered
porous
structures.
However,
the
conjugated
structures
between
adjacent
layers
of
can
often
result
in
aggregation‐caused
quenching
(ACQ)
properties.
Here,
study
designs
two
flexible
hydrazone‐linked
COFs
suppress
ACQ
effects,
thereby
enhancing
luminescent
activities.
Furthermore,
high
density
nitrogen
oxygen
atoms
on
these
walls
serves
as
binding
sites
hydrogen
bonding
interactions,
indicating
sensitivity
selectivity
towards
2,4,6‐trinitrophenol
detection.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 1, 2024
Abstract
Metal–organic
cage‐based
photo‐responsive
supramolecular
frameworks
(PSMFs)
with
permanent
porosity
have
gained
attention
for
their
modular
properties,
controllable
functionality,
and
light‐induced
reversible
responsiveness.
However,
high
efficiency
are
often
compromised
due
to
poor
structural
stability
upon
solvent
removal,
limiting
potential
applications.
Here,
a
solution
overcome
this
challenge
by
employing
surface
polymerization
strategy
using
isophorone
diisocyanate
(IDI)
stabilize
PSMF
(PCC‐20t)
is
presented.
This
approach
results
in
the
composite
of
PCC‐20t@PolyIDI,
which
preserves
crystallinity
high‐porosity
while
avoiding
collapse
commonly
observed
highly
porous
frameworks.
Moreover,
compared
activated
PCC‐20t,
PCC‐20t@PolyIDI
exhibits
an
18.6‐fold
increase
specific
area.
Remarkably,
variability
can
be
photo‐regulation
behavior
CO
2
capacity
under
irradiation
vis‐
UV‐light,
showing
27.9%
change
adsorption
amount
significantly
higher
than
that
PCC‐20t
7.0%
.
Grand
Canonical
Monte
Carlo
simulations
demonstrate
light‐regulated
performance
attributed
configuration
transformation
azobenzene
from
trans
‐
buckling
state.
The
findings
may
pave
way
stabilizing
materials
simultaneously
meet
demands
efficiency.
