Small,
Journal Year:
2023,
Volume and Issue:
19(23)
Published: March 8, 2023
The
well-defined
2D
or
3D
structure
of
covalent
organic
frameworks
(COFs)
makes
it
have
great
potential
in
photoelectric
conversion
and
ions
conduction
fields.
Herein,
a
new
donor-accepter
(D-A)
COF
material,
named
PyPz-COF,
constructed
from
electron
donor
4,4',4″,4'″-(pyrene-1,3,6,8-tetrayl)tetraaniline
accepter
4,4'-(pyrazine-2,5-diyl)dibenzaldehyde
with
an
ordered
stable
π-conjugated
is
reported.
Interestingly,
the
introduction
pyrazine
ring
endows
PyPz-COF
distinct
optical,
electrochemical,
charge-transfer
properties,
also
brings
plentiful
CN
groups
that
enrich
proton
by
hydrogen
bonds
to
enhance
photocatalysis
performance.
Thus,
exhibits
significantly
improved
photocatalytic
generation
performance
up
7542
µmol
g-1
h-1
Pt
as
cocatalyst,
clear
contrast
PyTp-COF
without
(1714
).
Moreover,
abundant
nitrogen
sites
1D
nanochannels
enable
as-prepared
COFs
immobilize
H3
PO4
carriers
through
bond
confinement.
resulting
material
has
impressive
8.10
×
10-2
S
cm-1
at
353
K,
98%
RH.
This
work
will
inspire
design
synthesis
COF-based
materials
both
efficient
future.
Chemical Society Reviews,
Journal Year:
2022,
Volume and Issue:
51(15), P. 6307 - 6416
Published: Jan. 1, 2022
This
review
highlights
the
recent
advances
of
metalated
covalent
organic
frameworks,
including
synthetic
strategies
and
applications,
discusses
current
challenges
future
directions.
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(30)
Published: April 29, 2023
Optimizing
the
electronic
structure
of
covalent
organic
framework
(COF)
photocatalysts
is
essential
for
maximizing
photocatalytic
activity.
Herein,
we
report
an
isoreticular
family
multivariate
COFs
containing
chromenoquinoline
rings
in
COF
and
electron-donating
or
withdrawing
groups
pores.
Intramolecular
donor-acceptor
(D-A)
interactions
allowed
tuning
local
charge
distributions
carrier
separation
under
visible
light
irradiation,
resulting
enhanced
performance.
By
optimizing
optoelectronic
properties
COFs,
a
uranium
extraction
efficiency
8.02
mg/g/day
was
achieved
using
nitro-functionalized
multicomponent
natural
seawater,
exceeding
performance
all
reported
to
date.
Results
demonstrate
effective
design
strategy
towards
high-activity
with
intramolecular
D-A
structures
not
easily
accessible
traditional
synthetic
approaches.
Angewandte Chemie International Edition,
Journal Year:
2022,
Volume and Issue:
61(42)
Published: Aug. 27, 2022
Abstract
Two‐dimensional
covalent
organic
frameworks
(2D‐COFs)
have
emerged
as
attractive
platforms
for
solar‐to‐chemical
energy
conversion.
In
this
study,
we
implemented
a
gradient
heating
strategy
to
synthesize
sp
2
‐carbon‐linked
triazine‐based
COF,
COF‐JLU100,
exhibiting
high
crystallinity,
large
surface
area,
good
durability
and
carrier
mobility
solar‐driven
photocatalytic
hydrogen
evolution.
The
Pt‐doped
COF‐JLU100
demonstrated
evolution
rate
of
over
100
000
μmol
g
−1
h
water
splitting
under
visible‐light
illumination
(λ>420
nm).
Experimental
theoretical
studies
corroborate
that
the
cyano‐vinylene
segments
in
extend
π‐delocalization
enable
fast
charge
transfer
separation
rates
well
dispersion
water.
Moreover,
can
be
prepared
by
low‐cost
easily
available
monomers
has
excellent
stability,
which
is
desirable
practical
production.
Advanced Materials,
Journal Year:
2022,
Volume and Issue:
35(24)
Published: Dec. 23, 2022
Abstract
Organic
photochemistry
is
intensely
developed
in
the
1980s,
which
nature
of
excited
electronic
states
and
energy
electron
transfer
processes
are
thoroughly
studied
finally
well‐understood.
This
knowledge
from
molecular
organic
can
be
transferred
to
design
covalent
frameworks
(COFs)
as
active
visible‐light
photocatalysts.
COFs
constitute
a
new
class
crystalline
porous
materials
with
substantial
application
potentials.
Featured
outstanding
structural
tunability,
large
porosity,
high
surface
area,
excellent
stability,
unique
photoelectronic
properties,
potential
candidates
various
research
areas
(e.g.,
photocatalysis).
review
aims
provide
state‐of‐the‐art
insights
into
COF
photocatalysts
(pristine,
functionalized,
hybrid
COFs)
for
transformations.
The
catalytic
reaction
mechanism
COF‐based
influence
dimensionality
crystallinity
on
heterogenous
photocatalysis
performance
also
discussed,
followed
by
perspectives
prospects
main
challenges
opportunities
future
Journal of the American Chemical Society,
Journal Year:
2023,
Volume and Issue:
145(3), P. 1475 - 1496
Published: Jan. 16, 2023
Multicomponent
reactions
(MCRs)
combine
at
least
three
reactants
to
afford
the
desired
product
in
a
highly
atom-economic
way
and
are
therefore
viewed
as
efficient
one-pot
combinatorial
synthesis
tools
allowing
one
significantly
boost
molecular
complexity
diversity.
Nowadays,
MCRs
no
longer
confined
organic
have
found
applications
materials
chemistry.
In
particular,
can
be
used
prepare
covalent
frameworks
(COFs),
which
crystalline
porous
assembled
from
monomers
exhibit
broad
range
of
properties
applications.
This
synthetic
approach
retains
advantages
small-molecule
MCRs,
not
only
strengthening
skeletal
robustness
COFs,
but
also
providing
additional
driving
forces
for
their
crystallization,
has
been
series
robust
COFs
with
diverse
The
present
perspective
article
provides
general
background
discusses
types
employed
COF
date,
addresses
related
critical
challenges
future
perspectives
inspire
MCR-based
design
new
promote
further
progress
this
emerging
field.
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(31)
Published: May 31, 2023
Covalent
organic
frameworks
(COFs),
possessing
pre-designable
structures
and
tailorable
functionalities,
are
promising
candidates
for
photocatalysis.
Nevertheless,
the
most
studied
imine-linked
COFs
(Im-COFs)
usually
suffer
from
unsatisfactory
stability
photocatalytic
performance.
To
meet
this
challenge,
a
series
of
highly
stable
enaminone-linked
(En-COFs)
have
been
synthesized
afford
much
improved
visible-light-driven
hydrogen
production
activities,
ranging
44
to
1078
times
that
isoreticular
Im-COFs,
with
only
difference
being
linkages
(enaminone
vs.
imine)
in
their
structures.
The
enhanced
light-harvesting
ability,
facilitated
exciton
dissociation
chemical
account
superior
activity.
Furthermore,
quinoline-linked
(Qu-COFs)
further
obtained
via
post-modification
Im-COFs.
Compared
activities
Qu-COFs
significantly
after
modification,
but
still
below
those
corresponding
En-COFs
(3-107
times).
facile
synthesis,
excellent
activity,
high
demonstrate
platform
Journal of the American Chemical Society,
Journal Year:
2023,
Volume and Issue:
145(28), P. 15465 - 15472
Published: July 7, 2023
Developing
diverse
synthetic
routes
to
prepare
various
crystalline
covalent
organic
frameworks
(COFs)
and
enrich
the
family
of
COFs
is
very
important
highly
desirable.
In
this
research,
we
demonstrate
that
Kröhnke
oxidation
(originally
developed
carbonyl
compounds)
can
be
employed
as
an
efficient
method
construct
two
nitrone-linked
(CityU-1
CityU-2)
through
ingenious
design
polynitroso-containing
precursors
well
exquisite
control
polymerization
conditions.
The
formation
structure
nitrone-based
linkage
units
have
been
confirmed
a
mode
reaction.
as-obtained
characterized
by
Fourier
transform
infrared
X-ray
photoelectron
spectroscopy,
powder
diffraction
patterns,
scanning
electron
microscopy.
Notably,
CityU-1
exhibits
BET
specific
surface
area
497.9
m2g-1
with
I2
capture
capacity
3.0
g
g-1
at
75
°C.
Our
research
would
provide
more
chances
for
applications.
