Angewandte Chemie International Edition,
Год журнала:
2022,
Номер
61(13)
Опубликована: Янв. 24, 2022
The
ordered
open
organic
frameworks
membranes
are
attractive
candidates
for
flow-assisted
molecular
separations.
physicochemical
properties
of
such
mostly
depend
on
their
selectively
chosen
functional
building
blocks.
In
this
work,
we
have
introduced
a
novel
concept
switchability
three-dimensional
covalent
framework
(3D-COF)
through
simple
solvent-influenced
fragmentation
method.
This
room-temperature
interfacial
synthesis
provides
free-standing
3D-COF
with
distinct
from
the
same
monomers.
Notably,
change
solvent
chloroform
to
ethyl
acetate
switches
membrane
property
hydrophilic
(water
contact
angle
60°)
hydrophobic
142°)
nature.
passes
oil
molecules
an
oil-water
emulsion
gravitational
flux
1536
L
m-2
h-1
.
Journal of the American Chemical Society,
Год журнала:
2023,
Номер
145(39), С. 21483 - 21490
Опубликована: Сен. 22, 2023
One-step
adsorptive
purification
of
ethylene
(C2H4)
from
a
ternary
mixture
acetylene
(C2H2),
C2H4,
and
ethane
(C2H6)
by
single
material
is
great
importance
but
challenging
in
the
petrochemical
industry.
Herein,
chemically
robust
olefin-linked
covalent
organic
framework
(COF),
NKCOF-62,
designed
synthesized
melt
polymerization
method
employing
tetramethylpyrazine
terephthalaldehyde
as
cheap
monomers.
This
avoids
most
disadvantages
classical
solvothermal
methods,
which
enable
cost-effective
kilogram
fabrication
COFs
one
pot.
Furthermore,
NKCOF-62
shows
remarkably
selective
adsorption
C2H2
C2H6
over
C2H4
thanks
to
its
unique
pore
environments
suitable
size.
Breakthrough
experiments
demonstrate
that
polymer-grade
can
be
directly
obtained
C2H2/C2H6/C2H4
(1/1/1)
mixtures
through
separation
process.
Notably,
first
demonstration
potential
use
for
separation,
provides
blueprint
design
construction
industrial
gas
separations.
Chemical Reviews,
Год журнала:
2023,
Номер
123(23), С. 13489 - 13692
Опубликована: Ноя. 14, 2023
As
a
key
structural
parameter,
phase
depicts
the
arrangement
of
atoms
in
materials.
Normally,
nanomaterial
exists
its
thermodynamically
stable
crystal
phase.
With
development
nanotechnology,
nanomaterials
with
unconventional
phases,
which
rarely
exist
their
bulk
counterparts,
or
amorphous
have
been
prepared
using
carefully
controlled
reaction
conditions.
Together
these
methods
are
beginning
to
enable
engineering
(PEN),
i.e.,
synthesis
phases
and
transformation
between
different
obtain
desired
properties
functions.
This
Review
summarizes
research
progress
field
PEN.
First,
we
present
representative
strategies
for
direct
modulation
diverse
kinds
nanomaterials.
We
cover
ranging
from
metal
nanostructures
such
as
Au,
Ag,
Cu,
Pd,
Ru,
alloys;
oxides,
borides,
carbides;
transition
dichalcogenides
(TMDs)
2D
layered
review
growth
wet-chemical
reduction
seed-mediated
epitaxial
chemical
vapor
deposition
(CVD),
high
pressure
transformation,
electron
ion-beam
irradiation.
After
that,
summarize
significant
influence
on
various
unconventional-phase
also
discuss
potential
applications
developed
areas
including
catalysis,
electrochemical
energy
storage
(batteries
supercapacitors),
solar
cells,
optoelectronics,
sensing.
Finally,
existing
challenges
future
directions
Advanced Materials,
Год журнала:
2023,
Номер
35(16)
Опубликована: Янв. 6, 2023
Macrocycles
with
well-defined
cavities
and
the
ability
to
undergo
supramolecular
interactions
are
classical
materials
that
have
played
an
essential
role
in
science.
However,
one
of
most
substantial
barriers
limiting
utilization
macrocycles
is
their
aggregation,
which
blocks
active
regions.
Among
many
attempted
strategies
prevent
such
installing
into
covalent
organic
frameworks
(COFs),
porous
stable
reticular
networks,
has
emerged
as
ideal
solution.
The
resulting
macrocycle-based
COFs
(M-COFs)
preserve
macrocycles'
unique
activities,
enabling
applications
various
fields
single-atom
catalysis,
adsorption/separation,
optoelectronics,
phototherapy,
structural
design
forming
single-layered
or
mechanically
interlocked
COFs.
properties
unmatchable
by
any
combination
other
substrates,
opening
a
new
chapter
advanced
materials.
This
review
focuses
on
latest
progress
concepts,
synthesis,
properties,
M-COFs,
presents
in-depth
outlook
challenges
opportunities
this
emerging
field.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Март 22, 2024
Abstract
Two-dimensional
(2D)
covalent
organic
frameworks
(COFs)
and
their
derivatives
have
been
widely
applied
as
electrocatalysts
owing
to
unique
nanoscale
pore
configurations,
stable
periodic
structures,
abundant
coordination
sites
high
surface
area.
This
work
aims
construct
a
non-thermodynamically
Pt-N
2
active
site
by
electrochemically
modifying
platinum
(Pt)
single
atoms
into
fully
conjugated
2D
COF
conductive
agent-free
pyrolysis-free
electrocatalyst
for
the
hydrogen
evolution
reaction
(HER).
In
addition
maximizing
atomic
utilization,
single-atom
catalysts
with
definite
structures
can
be
used
investigate
catalytic
mechanisms
structure-activity
relationships.
this
work,
in-situ
characterizations
theoretical
calculations
reveal
that
nitrogen-rich
graphene
analogue
not
only
exhibits
favorable
metal-support
effect
Pt,
adjusting
binding
energy
between
Pt
H*
intermediates
forming
instead
of
typical
4
environment,
but
also
enhances
electron
transport
ability
structural
stability,
showing
both
conductivity
stability
in
acidic
environments.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(25)
Опубликована: Апрель 16, 2024
Covalent
organic
frameworks
(COFs)
have
recently
shown
great
potential
for
photocatalytic
hydrogen
production.
Currently
almost
all
reports
are
focused
on
two-dimensional
(2D)
COFs,
while
the
3D
counterparts
rarely
explored
due
to
their
non-conjugated
derived
from
sp
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(22)
Опубликована: Март 19, 2024
Covalent
organic
frameworks
(COFs)
provide
a
molecular
platform
for
designing
novel
class
of
functional
materials
with
well-defined
structures.
A
crucial
structural
parameter
is
the
linkage,
which
dictates
how
knot
and
linker
units
are
connected
to
form
two-dimensional
polymers
layer
frameworks,
shaping
ordered
π-array
porous
architectures.
However,
roles
linkage
in
development
π
electronic
structures
functions
remain
fundamental
yet
unresolved
issues.
Here
we
report
designed
synthesis
COFs
featuring
four
representative
linkages:
hydrazone,
imine,
azine,
C=C
bonds,
elucidate
their
impacts
on
evolution
functions.
Our
observations
revealed
that
hydrazone
provides
non-conjugated
connection,
while
imine
azine
allow
partial
conjugation,
bond
permits
full
π-conjugation.
Importantly,
profoundly
influences
control
functions,
unraveling
its
pivotal
role
determining
key
properties
such
as
band
gap,
frontier
energy
levels,
light
absorption,
luminescence,
carrier
density
mobility,
magnetic
permeability.
These
findings
highlight
significance
chemistry
offer
general
transformative
guidance
framework
achieve
