Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
136(26)
Published: April 16, 2024
Abstract
Electrically
conducting
two‐dimensional
(2D)
metal–organic
frameworks
(MOFs)
have
garnered
significant
interest
due
to
their
remarkable
structural
tunability
and
outstanding
electrical
properties.
However,
the
design
synthesis
of
high‐performance
materials
face
challenges
limited
availability
specific
ligands
pore
structures.
In
this
study,
we
employed
a
novel
highly
branched
D
3h
symmetrical
planar
conjugated
ligand,
dodechydroxylhexabenzotrinaphthylene
(DHHBTN)
fabricate
series
2D
conductive
MOFs,
named
M–DHHBTN
(M=Co,
Ni,
Cu).
This
new
family
MOFs
offers
two
distinct
types
pores,
elevating
complexity
more
advanced
level.
The
intricate
tessellation
patterns
are
elucidated
through
comprehensive
analyses
involving
powder
X‐ray
diffraction,
theoretical
simulations,
high‐resolution
transmission
electron
microscope.
Optical‐pump
terahertz‐probe
spectroscopic
measurements
unveiled
carrier
mobility
in
DHHBTN‐based
spanning
from
0.69
3.10
cm
2
V
−1
s
.
Among
famility,
Cu‐DHHBTN
displayed
high
conductivity
reaching
0.21
S
at
298
K
with
thermal
activation
behavior.
work
leverages
“branched
conjugation”
ligand
encode
heteroporosity
into
underscoring
potential
heterogeneous
double‐pore
structures
for
future
applications.
Angewandte Chemie,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 9, 2025
Abstract
Photo/electro‐catalytic
CO
2
reduction
into
high‐value
products
are
promising
strategies
for
addressing
both
environmental
problems
and
energy
crisis.
Duo
to
their
advantageous
visible
light
absorption
ability,
adjustable
optic/electronic
properties,
definite
active
center,
post‐modification
capability,
excellent
stability,
porphyrin‐based
covalent
organic
frameworks
(COFs)
have
emerged
as
attractive
photo/electro‐catalysts
towards
reduction.
In
this
review,
the
research
progress
of
COFs
photo/electro‐catalytic
is
summarized
including
design
principles,
catalytic
performance,
reaction
mechanism.
addition,
review
also
presents
some
challenges
prospects
application
in
reduction,
laying
base
fundamental
efforts.
ACS Applied Materials & Interfaces,
Journal Year:
2025,
Volume and Issue:
17(9), P. 14623 - 14633
Published: Feb. 21, 2025
Photoluminescence
efficiencies
of
covalent
organic
frameworks
(COFs)
are
significantly
restricted
by
electron
delocalization
and
charge
transfer
among
the
conjugated
skeletons.
Two
nanofilms
using
tetraphenylethylene
benzo[c][1,2,5]thiadiazole
as
building
blocks
were
facilely
prepared
via
an
interfacially
confined
condensation
strategy.
The
distinct
dipole
moment
orientations
imine
linkages
involved
in
π-delocalization
donor-acceptor
systems
diversely.
They
also
played
critical
roles
affecting
fluorescence
turn-on
sensing
obtained
for
gaseous
trifluoroacetic
acid
(TFA).
joint
donor-C═N-acceptor
sequence
nanofilm
#2
resulted
relatively
stronger
originally
than
that
#1,
featuring
disturbed
donor-N═C-acceptor
sequence.
While
after
blowing
trace
TFA,
latter
#1
possessed
prominent
enhancement
obvious
color
visualization.
Comparative
transient
absorption
observations
theoretical
calculations
elucidated
effective
manipulation
intramolecular
(ICT)
imine-linked
functional
With
help
a
laminated
fluorescent
sensor,
compact
platform
was
further
integrated
optimized
#1.
It
exhibited
good
selectivity,
excellent
reversibility
(≥50
recycles),
extraordinary
detection
limit
(∼0.1
ppt),
rapid
recovery
process
to
TFA.
Our
findings
provide
valuable
optimizations
π-linkages
COFs
reliable
film
sensors
monitoring
toxic
hazardous
gases.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 4, 2025
The
isoindolinone
scaffold
is
an
important
structural
motif
found
in
a
wide
range
of
naturally
occurring
and
synthetic
biologically
active
compounds.
However,
the
synthesis
derivatives
typically
requires
multi-step
procedures
or
use
palladium-based
catalysts,
which
are
often
hampered
by
low
reaction
yields
high
costs.
Recently,
covalent
organic
frameworks
(COFs)-emerging
crystalline
porous
materials-have
gained
considerable
attention
for
their
applications
various
transformations,
particularly
C─H
functionalization,
cross-coupling
redox
reactions.
Although
COFs
have
been
extensively
studied
photocatalysis,
development
sustainable
heterogeneous
catalysts
using
low-cost
transition
metal-based
photosensitizers
still
its
early
stages.
Herein,
strategy
presented
to
incorporate
copper-Xantphos
complex
with
tetrahedral
Cu(I)
geometry
into
COF
matrix.
This
modification
enables
unprecedented
simultaneous
electron
energy
transfer
efficiency
during
photocatalysis.
Cu-Xantphos
coordinated
exhibits
potent
photocatalytic
activity
via
C─Br
bond
cleavage
followed
C─C
formation.
In
addition,
catalyst
shows
excellent
recyclability
as
it
can
be
rejuvenated
reintroducing
after
multiple
cycles-highlighting
potential
cost-effective
solution
valuable
transformations.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 20, 2025
Abstract
Covalent
organic
frameworks
(COFs)
are
emerging
as
a
transformative
platform
for
photocatalytic
hydrogen
peroxide
(H
2
O
)
production
due
to
their
highly
ordered
structures,
intrinsic
porosity,
and
molecular
tunability.
Despite
potential,
the
inefficient
utilization
of
photogenerated
charge
carriers
in
COFs
significantly
restrains
efficiency.
This
study
presents
two
regioisomeric
COFs,
α
‐TT‐TDAN
COF
β
COF,
both
incorporating
thieno[3,2‐b]thiophene
moieties,
investigate
influence
regioisomerism
on
excited
electron
distribution
its
impact
performance.
The
demonstrates
remarkable
solar‐to‐chemical
conversion
efficiency
1.35%,
outperforming
‐isomeric
counterpart,
which
is
merely
0.44%.
Comprehensive
spectroscopic
computational
investigations
reveal
critical
role
subtle
substitution
change
electronic
properties.
structural
adjustment
intricately
connects
structure
dynamics,
enabling
precise
regulation
distribution,
efficient
separation
transport,
localization
electrons
at
active
sites.
Moreover,
this
finely
tuned
interplay
enhances
oxygen
reduction
reaction.
These
findings
establish
new
paradigm
design,
offering
molecular‐level
strategy
advance
reticular
materials
toward
energy
conversion.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 24, 2025
Reticular
chemistry
has
greatly
stimulated
the
development
of
framework
materials,
yet
covalent
organic
frameworks
(COFs)
featuring
irregular
tiling
are
rare,
because
strict
constraints
on
tile
lengths
and
angles.
Guided
by
reticular
chemistry,
we
deconstructed
type
III
hexagonal
into
a
combination
D2h
+
monomers
achieved
first
successful
synthesis
2D
COFs
such
with
hit
topology.
By
tuning
crystal
growth
conditions,
obtained
set
isomers,
COF-hit
COF-bex,
distinct
structures.
Powder
X-ray
diffraction
high-resolution
transmission
electron
microscopy
were
employed
to
precisely
characterize
their
topology
demonstrates
outstanding
water
absorption
capabilities
under
high
humidity
conditions.
This
rational
design
using
opens
new
avenue
diversify
structural
types
topological
varieties
promote
chemistry.
