Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(34)
Опубликована: Июнь 11, 2024
In
this
study,
we
successfully
developed
two
novel
vinylene-linked
covalent
organic
frameworks
(COFs)
using
2-connected
3,6-dimethylpyridazine
through
Knoevenagel
condensation.
These
COFs
featured
finely
tailored
micro-/nano-scale
pore
sizes,
high
surface
areas
and
stable
non-polar
vinylene
linkages.
Finely
resolved
powder
X-ray
diffraction
patterns
demonstrated
highly
crystalline
structures
with
a
hexagonal
lattice
in
the
AA
layer
stacking.
The
resulting
one-dimensional
channels
possess
strong
hydrogen-bond
accepting
sites
arising
from
decorated
cis-azo/azine
units
pairs
of
fully
exposed
lone
pair
electrons,
endowing
as-prepared
exceptional
water
absorption
properties.
g-DZPH-COF
exhibited
successive
steep
uptake
steps
starting
low
relative
pressures
(P/P
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(8), С. 10661 - 10670
Опубликована: Фев. 20, 2024
Chiral
covalent
organic
frameworks
(COFs)
hold
considerable
promise
in
the
realm
of
heterogeneous
asymmetric
catalysis.
However,
fine-tuning
pore
environment
to
enhance
both
activity
and
stereoselectivity
chiral
COFs
such
applications
remains
a
formidable
challenge.
In
this
study,
we
have
successfully
designed
synthesized
series
clover-shaped,
hydrazone-linked
COFs,
each
with
varying
number
accessible
pyrrolidine
catalytic
sites.
Remarkably,
efficiencies
these
aldol
reaction
between
cyclohexanone
4-nitrobenzaldehyde
correlate
well
sites
within
frameworks.
The
COF
featuring
nearly
one
moiety
at
nodal
point
demonstrated
excellent
yields
enantiomeric
excess
(ee)
values,
reaching
up
97
83%,
respectively.
findings
not
only
underscore
profound
impact
deliberately
controlled
on
but
also
offer
new
perspective
for
design
synthesis
advanced
efficient
Abstract
Developing
an
efficient
freshwater
and
electricity
co‐generation
device
(FECGD)
can
solve
the
shortage
of
electricity.
However,
poor
salt
resistance
refrigeration
properties
materials
for
FECGD
put
big
challenges
in
stable
operation
these
devices.
To
address
issues,
we
propose
covalent
organic
framework
(COF)
confined
co‐polymerization
strategy
to
prepare
COF‐modified
acrylamide
cationic
hydrogels
(ACH‐COF),
where
hydrogen
bonding
interlocking
between
negatively
charged
polymer
chains
COF
pores
form
a
resistant
hydrogel
stabilizing
tunable
passive
interfacial
cooling
(TPIC).
The
FECPDs
based
on
TPIC
ACH‐COF
display
maximum
output
power
density
2.28
W
m
−2
,
which
is
4.3
times
higher
than
that
commercial
thermoelectric
generator
under
one
solar
radiation.
production
rate
reach
2.74
kg
h
−1
.
Our
results
suggest
high
efficiency
scalability
hold
promise
alleviating
shortages.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(47), С. 32161 - 32205
Опубликована: Ноя. 18, 2024
Covalent
organic
frameworks
(COFs)
are
created
by
the
condensation
of
molecular
building
blocks
and
nodes
to
form
two-dimensional
(2D)
or
three-dimensional
(3D)
crystalline
frameworks.
The
diversity
with
different
properties
functionalities
large
number
possible
framework
topologies
open
a
vast
space
well-defined
porous
architectures.
Besides
more
classical
applications
materials
such
as
absorption,
separation,
catalytic
conversions,
interest
in
optoelectronic
COFs
has
recently
increased
considerably.
electronic
both
their
linkage
chemistry
can
be
controlled
tune
photon
absorption
emission,
create
excitons
charge
carriers,
use
these
carriers
photocatalysis,
luminescence,
chemical
sensing,
photovoltaics.
In
this
Perspective,
we
will
discuss
relationship
between
structural
features
properties,
starting
connectivity,
layer
stacking
2D
COFs,
control
over
defects
morphology
including
thin
film
synthesis,
exploring
theoretical
modeling
structural,
electronic,
dynamic
discussing
recent
intriguing
focus
on
photocatalysis
photoelectrochemistry.
We
conclude
some
remarks
about
present
challenges
future
prospects
powerful
architectural
paradigm.
Angewandte Chemie,
Год журнала:
2024,
Номер
136(28)
Опубликована: Май 7, 2024
Abstract
Alkali
metals
(e.g.
Li,
Na,
and
K)
multivalent
Zn,
Mg,
Ca,
Al)
have
become
star
anodes
for
developing
high‐energy‐density
rechargeable
batteries
due
to
their
high
theoretical
capacity
excellent
conductivity.
However,
the
inevitable
dendrites
unstable
interfaces
of
metal
pose
challenges
safety
stability
batteries.
To
address
these
issues,
covalent
organic
frameworks
(COFs),
as
emerging
materials,
been
widely
investigated
regular
porous
structure,
flexible
molecular
design,
specific
surface
area.
In
this
minireview,
we
summarize
research
progress
COFs
in
stabilizing
anodes.
First,
present
origins
delve
into
advantages
based
on
physical/chemical
properties
alkali
metals.
Then,
special
attention
has
paid
application
host
design
anodes,
artificial
solid
electrolyte
interfaces,
additives,
solid‐state
electrolytes,
separator
modifications.
Finally,
a
new
perspective
is
provided
from
pore
modulation,
synthesis
COFs.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(34)
Опубликована: Июнь 11, 2024
In
this
study,
we
successfully
developed
two
novel
vinylene-linked
covalent
organic
frameworks
(COFs)
using
2-connected
3,6-dimethylpyridazine
through
Knoevenagel
condensation.
These
COFs
featured
finely
tailored
micro-/nano-scale
pore
sizes,
high
surface
areas
and
stable
non-polar
vinylene
linkages.
Finely
resolved
powder
X-ray
diffraction
patterns
demonstrated
highly
crystalline
structures
with
a
hexagonal
lattice
in
the
AA
layer
stacking.
The
resulting
one-dimensional
channels
possess
strong
hydrogen-bond
accepting
sites
arising
from
decorated
cis-azo/azine
units
pairs
of
fully
exposed
lone
pair
electrons,
endowing
as-prepared
exceptional
water
absorption
properties.
g-DZPH-COF
exhibited
successive
steep
uptake
steps
starting
low
relative
pressures
(P/P
