Journal of the American Chemical Society,
Journal Year:
2021,
Volume and Issue:
143(4), P. 2123 - 2129
Published: Jan. 22, 2021
The
construction
of
three-dimensional
covalent
organic
frameworks
(3D
COFs)
has
proven
to
be
very
challenging,
as
their
synthetic
driving
force
mainly
comes
from
the
formation
bonds.
To
facilitate
synthesis,
rigid
building
blocks
are
always
first
choice
for
designing
3D
COFs.
In
principle,
it
should
appealing
construct
COFs
flexible
blocks,
but
there
some
obstacles
blocking
development
such
systems,
especially
designed
synthesis
and
structure
determination.
Herein,
we
reported
a
novel
highly
crystalline
COF
(FCOF-5)
with
C–O
single
bonds
in
block
backbone.
By
merging
17
continuous
rotation
electron
diffraction
data
sets,
successfully
determined
crystal
FCOF-5
6-fold
interpenetrated
pts
topology.
Interestingly,
is
can
undergo
reversible
expansion/contraction
upon
vapor
adsorption/desorption,
indicating
breathing
motion.
Moreover,
smart
soft
polymer
composite
film
was
fabricated,
which
show
vapor-triggered
shape
transformation.
Therefore,
constructed
exhibit
interesting
behavior,
finally,
totally
new
type
porous
crystals
made
pure
framework
announced.
Chemical Society Reviews,
Journal Year:
2020,
Volume and Issue:
49(11), P. 3565 - 3604
Published: Jan. 1, 2020
The
current
advances,
structure-property
relationship
and
future
perspectives
in
covalent
organic
frameworks
(COFs)
their
nanosheets
for
electrochemical
energy
storage
(EES)
conversion
(EEC)
are
summarized.
Angewandte Chemie International Edition,
Journal Year:
2020,
Volume and Issue:
59(33), P. 13722 - 13733
Published: April 9, 2020
Abstract
Many
sophisticated
chemical
and
physical
properties
of
porous
materials
strongly
rely
on
the
presence
metal
ions
within
structures.
Whereas
homogeneous
distribution
metals
is
conveniently
realized
in
metal–organic
frameworks
(MOFs),
limited
stability
potentially
restricts
their
practical
implementation.
From
that
perspective,
development
metal–covalent
organic
(MCOFs)
may
address
these
shortcomings
by
incorporating
active
species
atop
highly
stable
COF
backbones.
This
Minireview
highlights
examples
MCOFs
tackle
important
issues
from
design,
synthesis,
characterization
to
cutting‐edge
applications.
Science,
Journal Year:
2020,
Volume and Issue:
370(6515)
Published: Oct. 22, 2020
Higher-valency
ligands
for
COFs
Metal-organic
frameworks
(MOFs)
have
exhibited
more
extensive
connectivity
(valency)
and
topological
diversity
than
covalent
organic
(COFs),
mainly
because
MOF
linkers
can
connect
from
3
to
24
discrete
units
or
even
infinity
one-dimensional
rods.
For
COFs,
generally
a
valency
of
4
that
reflect
the
carbon.
Gropp
et
al.
created
cubane-like
1,4-boronophenylphosphonic
acid
could
condense
make
with
8
or,
by
adding
acid,
form
large,
single
crystals
an
infinite-rod
topology.
Science
,
this
issue
p.
eabd6406
Journal of the American Chemical Society,
Journal Year:
2020,
Volume and Issue:
142(39), P. 16842 - 16848
Published: Sept. 6, 2020
Three-dimensional
(3D)
covalent
organic
frameworks
(COFs)
are
rare
because
there
is
a
limited
choice
of
building
blocks
that
offer
multiple
reactive
sites
in
polyhedral
geometry.
Here,
we
synthesized
an
cage
molecule
(Cage-6-NH2)
was
used
as
triangular
prism
node
to
yield
the
first
cage-based
3D
COF,
3D-CageCOF-1.
This
COF
adopts
unreported
2-fold
interpenetrated
acs
topology
and
exhibits
reversible
dynamic
behavior,
switching
between
small-pore
(sp)
structure
large-pore
(lp)
structure.
It
also
shows
high
CO2
uptake
captures
water
at
low
humidity
(<40%).
demonstrates
potential
for
expanding
structural
complexity
COFs
by
using
cages
units.
Journal of the American Chemical Society,
Journal Year:
2022,
Volume and Issue:
144(46), P. 21328 - 21336
Published: Nov. 9, 2022
Artificial
photosynthesis
of
H2O2
from
O2
reduction
provides
an
energy-saving,
safe,
and
green
approach.
However,
it
is
still
critical
to
develop
highly
active
selective
2e–
oxygen
reaction
photocatalysts
for
efficient
production
owing
the
unsatisfactory
productivity.
Herein,
two
new
two-dimensional
piperazine-linked
CoPc-based
covalent
organic
frameworks
(COFs),
namely,
CoPc-BTM-COF
CoPc-DAB-COF,
were
afforded
nucleophilic
substitution
hexadecafluorophthalocyaninato
cobalt(II)
(CoPcF16)
with
1,2,4,5-benzenetetramine
(BTM)
or
3,3′-diaminobenzidine
(DAB).
Powder
X-ray
diffraction
analysis
in
combination
electron
microscopy
a
series
spectroscopic
technologies
reveals
their
crystalline
porous
framework
fully
conjugated
structure
eclipsed
π-stacking
model.
Ultraviolet–visible
diffuse
reflectance
absorption
spectra
unveil
excellent
light
capacity
wide
range
400–1000
nm.
This,
together
enhanced
photo-induced
charge
separation
transport
efficiency
as
disclosed
by
photocurrent
response
photoluminescence
measurements,
endows
as-prepared
COFs
superior
photocatalytic
activity
toward
O2-to-H2O2
conversion
under
visible-light
irradiation
(λ
>
400
nm).
In
particular,
exhibits
record-high
yield
2096
μmol
h–1
g–1
among
COF-based
impressive
apparent
quantum
7.2%
at
630
The
present
result
should
be
helpful
fabricating
high-performance
low-cost
visible-light-driven
photosynthesis.
Giant,
Journal Year:
2021,
Volume and Issue:
6, P. 100054 - 100054
Published: Feb. 26, 2021
Covalent
organic
frameworks
(COFs)
are
the
emerging
type
of
crystalline
porous
materials,
prepared
through
reticular
chemistry
with
building
blocks
featuring
light
elements
(such
as
C,
H,
O,
N,
or
B
atoms),
and
connected
covalent
bond
extended
into
two
three
dimensions.
In
past
few
years,
COFs
have
attracted
attention
for
their
interesting
properties,
including
high-order
porosity,
structural
versatility,
facile
surface
modification,
high
thermal
chemical
stabilities.
Accordingly,
potential
platforms
diverse
practical
implementations,
gas
separation
storage,
heterogeneous
catalysis,
sensing,
luminescence,
electronic
devices,
drug
delivery,
energy
storage
conversion.
This
Review
provides
overview
design
strategies
synthetic
methodologies
that
been
used
widely
preparation
COFs,
also
summarizes
selected
examples
applications.
Chemical Society Reviews,
Journal Year:
2022,
Volume and Issue:
51(6), P. 2031 - 2080
Published: Jan. 1, 2022
Sensing
analysis
is
significantly
important
for
human
health
and
environmental
safety.
In
this
review,
POPs
used
as
platforms
various
sensing
applications
have
been
summarized
discussed.
