Abstract
Covalent
organic
frameworks
(COFs),
known
for
the
precise
tunability
of
molecular
structures,
hold
significant
promise
photocatalytic
hydrogen
peroxide
(H
2
O
)
production.
Herein,
by
systematically
altering
quinoline
(QN)
linkages
in
triazine
(TA)‐based
COFs
via
multi‐component
reactions,
six
R‐QN‐TA‐COFs
are
synthesized
with
identical
skeletons
but
different
substituents.
The
fine‐tuning
optoelectronic
properties
and
local
microenvironment
is
allowed,
thereby
optimizing
charge
separation
improving
interactions
dissolved
oxygen.
Consequently,
MeO‐QN‐TA‐COF
customized
to
achieve
an
impressive
rate
H
production
up
7384
µmol
g⁻
1
h⁻
under
air
atmosphere
water
without
any
sacrificial
agents,
surpassing
most
reported
COF
photocatalysts.
Its
high
stability
demonstrated
through
five
consecutive
recycling
experiments
characterization
recovered
COF.
reaction
mechanism
further
investigated
using
a
suite
quenching
experiments,
situ
spectroscopic
analysis,
theoretical
calculations.
enhanced
over
2e⁻
oxygen
reduction
oxidation
pathways.
Overall,
crucial
role
linkage
modulation
design
solar‐driven
effective
Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 14, 2025
Dynamic
covalent
organic
frameworks
(COFs)
represent
an
emerging
class
of
porous
materials
with
inherent
structural
flexibility.
However,
due
to
the
challenges
in
their
synthesis
and
characterization,
research
on
dynamic
COFs
remains
at
early
stage
requires
further
exploration.
Herein,
we
report
designed
a
novel
COF
entangled
2D
layers
that
exhibits
interesting
behavior
response
vapor
exposure.
By
employing
continuous
rotation
electron
diffraction
technique,
precisely
resolved
crystal
structures
before
after
adsorption.
Structural
analysis
revealed
vapor-induced
conformational
changes,
such
as
anthracene
unit
rotation,
triggered
layer
adjustments
reduced
entanglement
angles,
leading
significant
pore
structure
alterations.
This
study
not
only
introduces
new
but
also
provides
foundation
for
rational
design
flexibility
diverse
applications.
Chemical Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Room-temperature
synthesis
bridges
the
gap
between
chemistry
and
practical
application
of
COFs.
This
review
provides
an
overview
characterization
technologies
COF
growth
mechanisms
recent
room-temperature
synthetic
strategies.