Abstract
The
use
of
sunlight
to
convert
CO
2
into
multi‐carbon
fuels,
particularly
propylene,
is
considered
a
sustainable
carbon
cycle
pathway,
but
propylene
requires
multi‐electron‐coupled
proton
reaction
process
that
has
not
been
reported.
Herein,
two
covalent
organic
frameworks
(DA‐COF
and
DP‐COF)
are
prepared
by
varying
the
bridging
positions
anthraquinone
conjugated
units.
experimental
results
show
neighbouring
bridge
in
DA‐COF
forms
unique
cleavage
structure
like
an
enzyme
catalyst,
which
can
provide
efficient
microenvironment
for
reduction
trap
protons.
At
same
time,
neighbor
form
electron
donor‐electron
acceptor
accelerate
photogenerated
carrier
migration.
As
result,
exhibits
excellent
visible
light
production
with
yield
270.54
µmol
g
−1
no
C₃H₆
product
detected
DP‐COF
during
process.
This
study
presents
novel
avenue
high
value‐added
products
using
photocatalysis.
Herein,
a
N-phenylphenothiazine-based
hyper-cross-linked
polymer
(PTH-HCP)
was
finely
designed
and
constructed,
which
serves
as
metal-free
heterogeneous
photocatalyst
for
organic
transformations.
Characterization
experiments
have
shown
that
this
demonstrates
outstanding
stability,
extensive
surface
area,
exceptional
photoelectric
response
properties.
Moreover,
PTH-HCP
showed
good
catalytic
efficiency
recyclability
in
the
photochemically
driven
difluoromethylation/cyclization
reactions.
This
work
provides
strategy
design
construction
of
photocatalysts
offers
support
their
broad
prospects
synthetic
applications.
Chemistry - An Asian Journal,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 2, 2025
Abstract
Three
different
two
dimensional
Cd(II)‐based
metal−organic
frameworks
(MOFs)
have
been
synthesized
by
utilizing
same
N,N′‐donor
ligand
and
three
functionalized
dicarboxylate
linkers
namely
isophthalate,
5‐nitroisophthalate
5‐hydroxyisophthalate
for
compound
1
,
2
3
respectively.
The
compounds
that
are
isoreticular
bi‐walled
2D
frameworks,
show
dual
fluorescence
emission
spectra
their
π‐π*
n‐π*
excitation.
Compound
is
consists
of
unsubstituted
bridging
isophthalate
whereas
made
with
substituted
electron
withdrawing
–NO
group
donating
–OH
These
electronic
environments
in
MOFs
found
effective
to
respond
differently
towards
the
constitutional
isomers
aromatic
amines
having
suitable
environment.
responses
non‐polar
–CH
containing
picolylamine
moieties,
showing
maximum
enhancement
2‐picolylamine
comparison
3‐
4‐
isomer
derivates.
consisting
group,
more
significantly
rich
phenylenediamines
quenching
case
m‐phenylenediamine
compared
ortho
para
isomers.
change
functionalisation
from
helps
detect
deficient
aminopyridines;
where
has
observed
presence
3‐aminopyridine
contrast
its
other
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 24, 2025
Covalent
organic
frameworks
(COFs)
serve
as
an
outstanding
platform
for
heterogeneous
photocatalysis.
We
synthesized
two
analogous
pyrene-based
two-dimensional
COFs
with
π-conjugated
networks,
one
linked
by
C═N
bonds
and
the
other
C═C
bonds,
through
Schiff
base
Knoevenagel
condensation
reactions,
respectively.
investigated
impact
of
these
linkages
on
photocatalytic
activity
COFs,
using
visible-light-mediated
thioesterification
a
model
reaction.
It
was
found
that
olefin-linkage
COF
outperformed
imine-linkage
photocatalyst.
The
developed
protocol
demonstrated
broad
substrate
scope,
including
35
diverse
carboxylic
acids,
14
drug
molecules,
several
disulfide
coupling
partners,
achieving
up
to
95%
yield
thioesters.
practical
utility
this
strategy
is
further
its
successful
application
in
gram-scale
reactions.
photocatalyst
robust
successfully
reused
multiple
cycles
without
any
loss
catalytic
activity.
backbone
facilitated
enhanced
electron
transfer
upon
light
irradiation,
enabling
cross-coupling
acid
reductive
cycle.
Chemical Society Reviews,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Thin
film
technology
has
emerged
as
a
pivotal
field
with
numerous
industrial
applications.
Depending
on
their
properties-such
magnetic
characteristics,
conductivity,
architectural
structure,
stability,
and
functional
backbones-thin
films
are
widely
utilized
in
optoelectronics,
thin-film
coatings,
solar
cells,
energy
storage
devices,
semiconductors,
separation
However,
for
all
these
applications,
thin
must
be
securely
attached
to
specific
substrates,
substrate
compatibility
both
the
film-growth
process
is
crucial
optimal
performance.
In
this
review,
we
emphasize
significance
of
growing
films,
particularly
covalent
organic
framework
(COF)
suitable
substrates
tailored
various
For
technologies,
polymer
commonly
fabricated
porous
polymeric
or
metal-based
membranes.
contrast,
metals
metal
oxides
typically
deposited
conducting
serving
current
collectors
devices.
Semiconductor
other
hand,
often
grown
silicon
glass
transistor
Emerging
COF
tunable
properties,
well-defined
pore
channels,
versatile
backbones,
have
demonstrated
exceptional
potential
separation,
storage,
electronic
optoelectronic
interplay
between
well
growth
conditions,
remains
underexplored.
Studies
investigating
such
metals,
oxides,
glass,
silicon,
polymers,
ITO,
FTO
provided
insights
into
properties
that
promote
superior
growth.
The
quality
formed
significantly
influences
performance
Additionally,
discuss
stabilization
biological
like
peptide-based
biomimetic
catalysts
enzymes,
which
suffer
from
instability
non-aqueous
environments,
limiting
use.
Growing
membranes
can
enhance
stability
under
harsh
conditions.
We
also
highlight
techniques
ensuring
preservation
structural
integrity
properties.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 13, 2025
Abstract
Developing
non‐toxic,
efficient,
and
environment‐friendly
microbe‐resistant
surfaces
for
viral
infections
is
crucial,
considering
the
lengthy
complex
drug
development
process.
Here,
a
highly
efficient
antiviral
material
developed
with
Fe
3
O
4
nanoparticles‐embedded
covalent
organic
framework
(COF)
thin
film.
TpAzo‐Fe
,
film,
being
cost‐effective,
stable,
readily
synthesized
material,
offers
more
sustainable
approach
than
existing
materials.
The
precise
embedding
of
nanoparticles
on
COF
films
provides
stability
prevents
coagulation
in
experimental
media.
potential
film
evaluated
against
four
prototypes,
Influenza
Type
A/PR/8/1934
(H1N1),
A/turkey/Wisconsin/1/1966
(H9N2)
Human
Corona
Virus
(HCoV‐OC43
HCoV‐NL63).
Superior
activity
recorded
by
exhibiting
nearly
72%
cell
viability
H1N1,
≈99%
H9N2,
≈94%
HCoV‐OC43,
≈
98%
HCoV‐NL63
virus.
importance
apparent
from
control
experiment
nanoparticles‐loaded
polymer
(TpmXDA‐Fe
).
Finally,
an
“antiviral
filtration”
performed
residual
(H1N1
virus)
filtrate
assessed.
results
revealed
≈95%
viability,
suggesting
complete
sequestration/containment
test
virus
during
filtration.
Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 14, 2024
Abstract
While
being
important
candidate
for
heterogeneous
photocatalyst,
conjugated
polymer
typically
exhibits
random
charge
transfers
between
the
alternating
donor
and
acceptor
units,
which
severely
limits
its
catalytic
efficiency.
Herein,
inspired
by
natural
photosystem,
concept
of
guiding
migration
to
specific
reaction
sites
is
employed
significantly
boost
photocatalytic
performance
linear
polymers
(LCPs)
with
pendant
functional
groups
via
creating
programmed
charge‐transfer
channels
from
backbone
moiety.
The
benzothiadiazole,
as
revealed
in
both
situ
X‐ray
photoelectron
spectroscopy
(XPS)
density
theory
(DFT)
calculations,
can
act
electron
“reservoir”
that
aggregates
electrons
at
active
sites.
Moreover,
presence
channels,
evidenced
transient
absorption
(TAS),
accelerates
transfer,
preventing
recombination
holes.
As
a
result,
this
elaborately‐designed
architecture,
photogenerated
move
smoothly
towards
reduction
sites,
facilitating
O
2
into
H
,
while
remaining
holes
are
directed
oxidation
centers,
simultaneously
oxidizing
furfuryl
alcohol
furoic
acid.
optimized
photocatalyst
LCP‐BT
demonstrates
competitive
productivity
868.3
μmol
L
−1
h
(9.8
times
higher
than
conventional
LCP‐1)
conversion
over
95
%
after
6
h.
