Journal of the American Chemical Society,
Journal Year:
2017,
Volume and Issue:
139(25), P. 8693 - 8697
Published: June 9, 2017
Covalent
organic
frameworks
(COFs)
featuring
chirality,
stability,
and
function
are
of
both
fundamental
practical
interest,
but
yet
challenging
to
achieve.
Here
we
reported
the
metal-directed
synthesis
two
chiral
COFs
(CCOFs)
by
imine-condensations
enantiopure
1,2-diaminocyclohexane
with
C3-symmetric
trisalicylaldehydes
having
one
or
zero
3-tert-butyl
group.
Powder
X-ray
diffraction
modeling
studies,
together
pore
size
distribution
analysis
demonstrate
that
Zn(salen)-based
CCOFs
possess
a
two-dimensional
hexagonal
grid
network
AA
stacking.
Dramatic
enhancement
in
chemical
stability
toward
acidic
(1
M
HCl)
basic
(9
NaOH)
conditions
was
observed
for
COF
incorporated
tert-butyl
groups
on
walls
compared
nonalkylated
analog.
The
Zn(salen)
modules
allow
installing
multivariate
metals
into
postsynthetic
metal
exchange.
exchanged
maintain
high
crystallinity
porosity
can
serve
as
efficient
recyclable
heterogeneous
catalysts
asymmetric
cyanation
aldehydes,
Diels–Alder
reaction,
alkene
epoxidation,
epoxide
ring-opening,
related
sequential
reactions
up
97%
ee.
Chemical Reviews,
Journal Year:
2020,
Volume and Issue:
120(16), P. 8814 - 8933
Published: Jan. 22, 2020
Covalent
organic
frameworks
(COFs)
are
a
class
of
crystalline
porous
polymers
with
permanent
porosity
and
highly
ordered
structures.
Unlike
other
polymers,
significant
feature
COFs
is
that
they
structurally
predesignable,
synthetically
controllable,
functionally
manageable.
In
principle,
the
topological
design
diagram
offers
geometric
guidance
for
structural
tiling
extended
polygons,
polycondensation
reactions
provide
synthetic
ways
to
construct
predesigned
primary
high-order
Progress
over
past
decade
in
chemistry
these
two
aspects
undoubtedly
established
base
COF
field.
By
virtue
availability
units
diversity
topologies
linkages,
have
emerged
as
new
field
materials
offer
powerful
molecular
platform
complex
tailor-made
functional
development.
Here
we
target
comprehensive
review
field,
historic
overview
survey
advances
topology
reactions,
illustrate
features
diversities,
scrutinize
development
potential
various
functions
through
elucidating
structure–function
correlations
based
on
interactions
photons,
electrons,
holes,
spins,
ions,
molecules,
discuss
key
fundamental
challenging
issues
need
be
addressed,
predict
future
directions
from
chemistry,
physics,
perspectives.
Advanced Functional Materials,
Journal Year:
2018,
Volume and Issue:
28(33)
Published: July 8, 2018
Abstract
Covalent
organic
frameworks
(COFs)
are
crystalline
porous
polymers
formed
by
a
bottom‐up
approach
from
molecular
building
units
having
predesigned
geometry
that
connected
through
covalent
bonds.
They
offer
positional
control
over
their
blocks
in
two
and
three
dimensions.
This
enables
the
synthesis
of
rigid
structures
with
high
regularity
ability
to
fine‐tune
chemical
physical
properties
network.
Feature
Article
provides
comprehensive
overview
realized
date
fast
growing
field
framework
development.
Different
strategies
meet
diverse
demands,
such
as
crystallinity,
straightforward
processability,
or
formation
thin
films
discussed.
Furthermore,
insights
into
fields
COF
applications,
including
gas
storage
separations,
sensing,
electrochemical
energy
storage,
optoelectronics
provided.
Chemical Society Reviews,
Journal Year:
2020,
Volume and Issue:
50(1), P. 120 - 242
Published: Dec. 7, 2020
Covalent
organic
frameworks
offer
a
molecular
platform
for
integrating
units
into
periodically
ordered
yet
extended
2D
and
3D
polymers
to
create
topologically
well-defined
polygonal
lattices
built-in
discrete
micropores
and/or
mesopores.
Nature Communications,
Journal Year:
2018,
Volume and Issue:
9(1)
Published: Jan. 8, 2018
Current
technologies
for
removing
heavy
metal
ions
are
typically
ion
specific.
Herein
we
report
the
development
of
a
broad-spectrum
trap
by
incorporation
ethylenediaminetetraacetic
acid
into
robust
metal-organic
framework.
The
capture
experiments
total
22
ions,
covering
hard,
soft,
and
borderline
Lewis
show
that
is
very
effective,
with
removal
efficiencies
>99%
single-component
adsorption,
multi-component
or
in
breakthrough
processes.
material
can
also
serve
as
host
loading
arbitrary
selections
amounts/types
controllable
uptake
ratio
to
prepare
well-dispersed
single
multiple
catalysts.
This
supported
excellent
performance
prepared
Pd2+-loaded
composite
toward
Suzuki
coupling
reaction.
work
proposes
versatile
may
find
applications
fields
separation
catalysis.
Journal of the American Chemical Society,
Journal Year:
2018,
Volume and Issue:
140(32), P. 10094 - 10098
Published: July 18, 2018
Covalent
organic
frameworks
(COFs)
have
been
proposed
as
alternative
candidates
for
molecular
sieving
membranes
due
to
their
chemical
stability.
However,
developing
COF
with
narrowed
apertures
close
the
size
of
common
gas
molecules
is
a
crucial
task
selective
separation.
Herein,
we
demonstrate
new
type
two-dimensional
layered-stacking
COF-COF
composite
membrane
in
bilayer
geometry
synthesized
on
porous
support
by
successively
regulating
growth
imine-based
COF-LZU1
and
azine-based
ACOF-1
layers
via
temperature-swing
solvothermal
approach.
The
resultant
COF-LZU1-ACOF-1
has
much
higher
separation
selectivity
H2/CO2,
H2/N2,
H2/CH4
mixtures
than
individual
formation
interlaced
pore
networks,
overall
performance
surpasses
Robeson
upper
bounds.
also
shows
high
thermal
long-time
stabilities.
