Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 6, 2025
Abstract
In
order
to
inhibit
non‐radiative
decay
pathways
of
covalent‐organic
frameworks
(COFs),
a
strategy
is
proposed
block
intralayer
conjugation
and
interlayer
π–π
stacking
by
using
flexible
aggregation‐induced
emission
(AIE)
building
blocks
(4′,4′′′,4′′′′′,4′′′′′′′‐(1,2‐ethenediylidene)
tetrakis[1,1′‐biphenyl]‐4‐carbaldehyde
(TFBE))
connected
weakly
conjugated
linker.
By
the
TFBE
as
changing
flexibility
linker,
TFBE‐COFs
with
different
luminescence
properties
are
obtained.
Experimental
theoretical
results
show
that
these
have
high
crystallinity
large
layer
spacing,
among
which
photoluminescence
quantum
yield
hydrazone
(Hz)‐COF
TFBE‐ODH
(oxalyl
dihydrazide
(ODH))
in
solid
state
reaches
26.28%,
superior
most
COFs
reported
so
far.
The
excellent
attributed
non‐planar
geometry
TFBE,
inhibits
quenching.
Moreover,
π‐electron
delocalization‐induced
leaps
suppressed
further
enhances
TFBE‐COFs.
Hz‐COF
exhibits
sensing
performance
for
trace
tetracycline,
detection
limit
0.15
µ
m
.
addition,
white
light‐emitting
diodes
coated
manufactured
achieve
high‐quality
light
emission.
This
study
provides
new
design
application
high‐emission
COFs.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 8, 2024
Abstract
Precious
metals
are
valuable
materials
for
the
chemical
industry,
but
they
scarce
and
pose
a
risk
of
supply
disruption.
Recycling
precious
from
waste
is
promising
strategy,
here
we
tactfully
utilize
light
irradiation
as
an
environmental‐friendly
energy‐saving
adjunctive
strategy
to
promote
reduction
metal
ions,
thereby
improving
adsorption
capacity
kinetics.
A
newly
light‐sensitive
covalent
organic
framework
(PP‐COF)
was
synthesized
illustrate
effectiveness
feasibility
this
auxiliary
strategy.
The
equilibrium
capacities
PP‐COF
with
towards
gold,
platinum,
silver
ions
4729,
573,
519
mg
g
−1
,
which
3.3,
1.9,
1.2
times
under
dark
condition.
Significantly,
filtration
column
can
recover
more
than
99.8
%
gold
in
simulated
e‐waste
leachates
irradiation,
1
gram
up
0.15
tonne
leachates.
Interestingly,
captured
by
mainly
exist
micron‐sized
particles,
be
easily
separated
extraction.
We
believe
work
contribute
recovery
circular
economy
recycling
resources.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 13, 2025
The
synthesis
of
covalent
organic
frameworks
(COFs)
with
excellent
luminescent
properties
and
their
effective
application
in
the
field
bionic
sensing
remain
a
formidable
challenge.
Herein,
series
COFs
different
numbers
hydroxyl
groups
are
successfully
synthesized,
number
on
benzene-1,3,5-tricarbaldehyde
(BTA)
linker
influences
final
COFs.
COF
(HHBTA-OH)
prepared
hydrazine
hydrate
(HH)
BTA
containing
one
group
as
ligands
exhibits
best
fluorescent
performance.
MA@HHBTA-OH
is
formed
by
reaction
HHBTA-OH
meldrum's
acid
(MA)
has
its
extremely
high
hydrophilicity,
dispersibility,
strong
red
fluorescence,
which
can
imitate
human
gustatory
system
to
detect
bitter
substances.
was
combined
agarose
(AG)
construct
MA@HHBTA-OH@AG
film
for
assessing
food
freshness.
In
addition,
an
acoustic
MA@HHBTA-OH@MF
sensor
fabricated
integrating
melamine
foam
(MF)
through
hydrogen
bond.
functions
like
eardrum
recognizes
sound
pressure
waves
mechanical
summary,
biomimetic
sensors
based
were
constructed,
monitor
auditory,
gustatory,
olfactory
information
achieve
multimode
perception
sound,
substances,
Nano Letters,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 23, 2025
Covalent-organic
frameworks
(COFs)
are
dynamic
covalent
porous
organic
materials
constructed
from
emissive
molecular
building
blocks.
However,
most
two-dimensional
(2D)
COFs
nonemissive
or
weakly
in
the
solid
state
owing
to
intramolecular
rotation
and
vibration
together
with
strong
π-π
interactions.
Herein,
we
report
a
pressure
strategy
achieve
bright
multicolor
emission
yellow
red
2D
triazine
triphenyl
imine
COF
(TTI-COF).
Intriguingly,
TTI-COF
experiences
24-fold
enhancement
under
mild
of
2.7
GPa
compared
initial
state.
Joint
experimental
theoretical
results
reveal
that
restricted
chemical
bond
vibrations
reduced
interactions
originating
offset
stacking
mode
account
for
significant
pressure-induced
enhancement.
Furthermore,
such
piezochromic
behavior
may
be
ascribed
decreased
energy
gap
enhanced
intermolecular
interaction.
Our
investigation
offers
constructive
guidelines
designing
high
photoluminescence
performance.
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 6, 2025
Abstract
In
order
to
inhibit
non‐radiative
decay
pathways
of
covalent‐organic
frameworks
(COFs),
a
strategy
is
proposed
block
intralayer
conjugation
and
interlayer
π–π
stacking
by
using
flexible
aggregation‐induced
emission
(AIE)
building
blocks
(4′,4′′′,4′′′′′,4′′′′′′′‐(1,2‐ethenediylidene)
tetrakis[1,1′‐biphenyl]‐4‐carbaldehyde
(TFBE))
connected
weakly
conjugated
linker.
By
the
TFBE
as
changing
flexibility
linker,
TFBE‐COFs
with
different
luminescence
properties
are
obtained.
Experimental
theoretical
results
show
that
these
have
high
crystallinity
large
layer
spacing,
among
which
photoluminescence
quantum
yield
hydrazone
(Hz)‐COF
TFBE‐ODH
(oxalyl
dihydrazide
(ODH))
in
solid
state
reaches
26.28%,
superior
most
COFs
reported
so
far.
The
excellent
attributed
non‐planar
geometry
TFBE,
inhibits
quenching.
Moreover,
π‐electron
delocalization‐induced
leaps
suppressed
further
enhances
TFBE‐COFs.
Hz‐COF
exhibits
sensing
performance
for
trace
tetracycline,
detection
limit
0.15
µ
m
.
addition,
white
light‐emitting
diodes
coated
manufactured
achieve
high‐quality
light
emission.
This
study
provides
new
design
application
high‐emission
COFs.
