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.
Advanced Energy Materials,
Journal Year:
2024,
Volume and Issue:
14(40)
Published: July 18, 2024
Abstract
The
integration
of
electron
donor
(D)
and
acceptor
(A)
units
into
covalent
organic
frameworks
(COFs)
has
received
increasing
interest
due
to
its
potential
for
efficient
photocatalytic
hydrogen
(H
2
)
evolution
from
water.
Nevertheless,
the
advancement
D–A
COFs
is
still
constrained
by
limited
investigations
on
engineering,
which
enables
highly
effective
charge
transfer
pathways
in
deliver
photoexcited
electrons
a
preferential
orientation
enhance
performance.
Herein,
two
systems
with
D–A–A
configurations
based
molecular
engineering
strategy
are
proposed
construct
three
distinct
COFs.
Specifically,
TAPPy‐DBTDP‐COF
merging
one
pyrene‐based
benzothiadiazole
acceptors
realized
an
average
H
rate
12.7
mmol
h
−1
g
under
visible
light,
among
highest
ever
reported
typical
D–A‐type
COF
systems.
combination
experimental
theoretical
analysis
signifies
crucial
role
dual‐acceptor
arrangement
promoting
exciton
dissociation
carrier
migration.
These
findings
underscore
significant
structural
design,
conducive
separation
holes
resulting
superior
activities.
Green Chemistry,
Journal Year:
2024,
Volume and Issue:
26(18), P. 9619 - 9651
Published: Jan. 1, 2024
This
review
focuses
on
advances
in
covalent
organic
framework
(COF)
photocatalysts
for
cross-coupling
reactions,
which
provide
a
greener
catalytic
route
transformations.
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.
Covalent
organic
frameworks
(COFs)
have
garnered
significant
interest
within
the
scientific
community
due
to
their
distinctive
ability
act
as
semiconductors
responsive
visible
light.
This
unique
attribute
makes
them
up-and-coming
candidates
for
facilitating
photocatalytic
reactions.
Herein,
two
donor-acceptor
COFs,
TPE-BSD-COF
and
TPE-BD-COF,
been
designed
synthesized
by
incorporating
electron-rich
tetraphenylethylene
electron-deficient
benzoselenadiazole
benzothiadiazole
units
into
framework
through
a
Schiff-base
polycondensation
reaction.
Both
COFs
exhibits
exceptional
crystallinity
enduring
porosity.
TPE-BD-COF
exhibit
broad
light
absorption
capabilities,
narrow
optical
band
gap,
low
electrochemical
impedance
spectrum
(EIS)
levels,
indicating
that
are
effective
heterogeneous
photocatalysts
reductive
dehalogenation
of
benzoyl
bromide
derivatives
under
blue
LED
irradiation.
achieved
high
yield
98%
95%,
respectively,
only
one
hour.
