Covalent
Organic
Frameworks
(COFs)
exhibiting
kagome
(kgm)
structures
are
promising
crystalline
porous
materials
with
two
distinct
pores.
However,
the
challenge
arises
from
potential
formation
of
polymorphic
square-lattice
(sql)
structure,
which
is
undesired
in
some
cases.
To
this,
we
introduce
a
novel
linker
design
strategy
featuring
bulky
functional
groups,
enforcing
preferred
kgm
while
hindering
sql
network
formation.
Implementing
this
design,
synthesized
terphenyl
core-based
tetraaldehyde
(4A2E)
incorporating
methoxycarbonyl-terminated
phenyl
group.
By
varying
diamine
lengths,
using
phenylenediamine
(PDA)
and
benzidine
(Bz),
steric
interaction
was
tuned
leading
to
different
topologies.
Structural
analysis
revealed
an
unusual
ABC
stacking
for
4A2E-PDA-COF
short
PDA
linker,
contrast
4A2E-Bz-COF
longer
benzidine.
This
interaction-driven
enhances
control
over
COF
structures,
expanding
toolbox,
but
also
provides
valuable
insights
into
polymorphism.
Advanced Materials,
Год журнала:
2023,
Номер
36(1)
Опубликована: Окт. 2, 2023
Covalent
organic
frameworks
(COFs)
have
shown
great
advantages
as
photocatalysts
for
hydrogen
evolution.
However,
the
effect
of
linkage
geometry
and
type
on
extent
π-electron
conjugation
in
plane
framework
photocatalytic
properties
COFs
remains
a
significant
challenge.
Herein,
two
Kagome
(kgm)
topologic
oligo(phenylenevinylene)-based
are
designed
synthesized
boosting
evolution
via
"two
one"
strategy.
Under
visible
light
irradiation,
COF-954
with
5
wt%
Pt
cocatalyst
exhibits
high
rate
(HER)
137.23
mmol
g
Chemical Communications,
Год журнала:
2024,
Номер
60(33), С. 4423 - 4426
Опубликована: Янв. 1, 2024
Minute
structural
variations
in
Py-BT-COF
isomers
can
generate
significant
differences
redox
and
photophysical
properties,
resulting
divergent
photocatalytic
performances
H
2
reduction
rhodamine
B
degradation.
2D
covalent
organic
framework
(COF)
materials
with
extended
conjugated
structure
and
periodic
columnar
π-arrays
exhibit
promising
applications
in
optoelectronics.
However,
there
is
a
scarcity
of
reports
on
optoelectronic
COFs,
mainly
due
to
the
lack
suitable
π-skeletons.
Here,
two
multi-functional
COFs
DPP-TPP-COF
DPP-TBB-COF
are
constructed
diketopyrrolopyrrole
as
electron
acceptor
(A),
1,3,6,8-tetraphenylpyrene
1,3,5-triphenylbenzene
donor
(D)
through
imine
bonds.
Both
showed
good
crystallinities
AA
stacking
rhombic
for
hexagonal
one
DPP-TBB-COF,
respectively.
The
D-A
ordered
intermolecular
packing
structures
endow
broad
UV-vis
absorptions
narrow
bandgaps
along
HOMO/LUMO
energy
levels,
resulting
properties,
including
photothermal
conversion,
supercapacitor
property,
ambipolar
semiconducting
behavior.
Among
them,
exhibits
high
conversion
efficiency
47%
under
660
nm
laser
irradiation,
while
superior
specific
capacitance
384
F
g
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 14, 2025
Abstract
In
recent
years,
kagome
materials
have
attracted
significant
attention
due
to
their
rich
emergent
phenomena
arising
from
the
quantum
interplay
of
geometry,
topology,
spin,
and
correlations.
However,
in
search
for
materials,
it
has
been
found
that
bulk
compounds
with
electronic
properties
related
lattice
are
relatively
scarce,
primarily
hybridization
layers
adjacent
layers.
Therefore,
researchers
shown
increasing
interest
discovery
construction
2D
aiming
achieve
clean
bands
near
Fermi
level
monolayer
or
few‐layer
systems.
Substantial
advancements
already
made
this
area.
review,
current
progress
is
summarized
development
materials.
The
geometric
structures
model
begin
by
introducing
its
variants,
followed
discussions
on
experimental
realizations
structure
characterizations
Finally,
an
outlook
provided
future
developments
The Journal of Physical Chemistry C,
Год журнала:
2024,
Номер
128(23), С. 9413 - 9421
Опубликована: Июнь 4, 2024
The
giant
delocalized
π-electron
system
in
pristine
graphene
is
a
double-edged
sword;
i.e.,
it
gives
rise
to
high
electrical
conductivity
but
results
chemical
inertness.
Therefore,
cannot
be
directly
used
as
an
anode
for
alkali
metal-ion
batteries
due
its
poor
ion
adsorption
capacity.
We
propose
two-dimensional
carbon
allotrope
(named
TOD-graphene)
with
combined
kagome–honeycomb
lattice.
robust
energetic,
dynamic,
thermodynamic,
and
mechanical
stabilities
of
TOD-graphene
indicate
the
feasibility
synthesis.
introduction
kagome
topology
can
disrupt
π-bonding
network,
thereby
enhancing
surface
reactivity.
Its
inherent
metallicity
remarkable
activity
render
promising
material
high-performance
potassium-ion
(PIBs).
monolayer
characterized
by
energy
density
(theoretical
specific
capacity
1115.8
mA
h
g–1),
good
rate
performance
(diffusion
barrier
0.36
eV),
low
output
voltage
(average
open-circuit
0.52
V).
In
presence
electrolytes,
there
apparent
enhancement
K
diffusion
capabilities.
Moreover,
bilayer
significantly
affects
both
strength
mobility
K.
These
findings
demonstrate
that
excellent
PIBs.
The
Monte
Carlo
studies
presented
in
this
paper
provide
insight
into
stable
phases,
magnetic
hysteresis
cycles
and
magnetization
plateaus
mixed
nano-Kagome
bilayer
lattices.
In
particular,
exchange
coupling
reduction
affects
coercive
saturation
fields,
temperature
variations
impact
loop
regions.
role
of
the
crystal
field
design
was
highlighted.
study
explores
interaction
plates
their
response
to
critical
depending
on
ferrielectric
coupling.
Extremely
low
temperatures
([Formula:
see
text])
play
a
crucial
manifestation
plateaus.
These
results
suggest
possible
applications
nanotechnology,
particularly
storage
media.
Journal of Materials Chemistry C,
Год журнала:
2024,
Номер
12(32), С. 12249 - 12253
Опубликована: Янв. 1, 2024
Two
benzothiadiazole-based
COFs,
constructed
using
“two-in-one”
monomers,
exhibit
significantly
different
photocatalytic
hydrogen
generation
performances
due
to
their
distinct
imine
bond
orientations.
Chemical Science,
Год журнала:
2024,
Номер
15(35), С. 14449 - 14457
Опубликована: Янв. 1, 2024
Using
a
linker
with
bulky
functional
groups
encourages
kagome
formation,
while
blocking
square-lattice
network
formation
in
Covalent
Organic
Frameworks
(COFs).
