Journal of Polymer Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 29, 2024
ABSTRACT
π‐Conjugated
polymers
containing
coumarin
backbone
in
the
main
chain
show
acid–base
responsive
fluorescence.
The
α‐pyrone
ring
unit
undergoes
hydrolysis
by
inorganic
bases
and
triggers
change
of
expanded
π‐conjugated
system,
resulting
reversible
fluorescence
on/off
switching,
dual‐colored
halochromic
fluorescence,
alkali
metal
ion
recognition.
We
assume
that
form
complexes
with
ions
during
hydrolysis.
In
this
study,
we
investigated
quenching
behaviors
responsivity
3,7‐dibromo‐4‐methylcoumarin,
3,7‐bis(phenylethynyl)‐4‐methylcoumarin
(model
compound),
two
types
coumarin‐based
addition
organic
for
comparison.
Consequently,
model
compound
demonstrated
remarkably
switching
behaviors,
highlighting
significant
role
metal‐free
HCl
aqueous
solution
facilitating
ring‐opening
closing
properties.
notable
reversibility
specifically
PL
intensity.
These
results
are
expected
to
enhance
our
understanding
how
recognized
polymers.
Inorganic Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 28, 2025
Pyrazine
(tppz)
and
5-sulfosalicylic
acid
(H3SSA)
mixed-bridging
Cd(II)-CP,
{[Cd2(HSSA)2(tppz)2]}n
(1),
is
highly
luminescent,
the
emission
has
been
quenched
selectively
by
Al3+
in
presence
of
other
cations,
with
a
limit
detection
(LOD)
43.9
nM
(1.18
ppb).
The
1
also
4-nitroaniline
(4-NA)
(LOD,
49
nM)
dicloran
(2,6-dichloro-4-nitroaniline,
DCN),
pesticide
42.8
nM),
an
aqueous
medium
existence
11
nitroaromatic
compounds
(NACs).
structure
probe,
1,
shows
diverse
bridging
pyridyl-N
tppz
carboxylate-O
HSSA2-
to
architect
2D
CP
16-member
metallo-macrocycle,
followed
S═O···Cd(II)
(2.291(2)
Å),
π···π
(3.892
C-H···π
noncovalent
interactions
form
3D
supramolecular
cavity.
phenolic-OH
remains
uncoordinated
cavity
network.
Upon
interaction
Al3+/4-NA/DCN
Cd(II)-CP
free
may
induce
easy
dissociation,
which
assist
energy
transfer
for
quenching.
explained
through
various
experiments
theoretical
calculations.
DFT
computation
determines
band
gap
as
3.42
eV
(experimentally,
3.18
eV),
motivated
measure
electrical
conductivity.
conductivity,
3.53
×
10-5
S
m-1
(dark),
enhanced
upon
light
irradiation
7.66
m-1.
Ultrasonics Sonochemistry,
Год журнала:
2025,
Номер
114, С. 107264 - 107264
Опубликована: Фев. 8, 2025
The
3D
coordination
polymers
of
lead
(II)
[Pb4(O)(L)3(H2O)]n,
where
H2L
=
C6H4(CO2H)2
(benzene-1,3-dicarboxylic
acid),
were
synthesized
in
crystalline
(1(a,
b))
and
amorphous
(2(a,
phases.
Hydrothermal
branch
tube
methods
used
to
self-assemble
from
the
bottom
up
create
Single-crystal
X-ray
diffraction
(SC-XRD)
was
investigate
two
crystallized
metal-organic
frameworks
(MOFs)
with
same
space
group
chemical
formula
(P21/c).
Through
controlled
green
sonochemical
methods,
an
ultrasonic
bath
a
probe
homogenizer
prepare
nano
[Pb4(O)(L)3(H2O)]n
phase.
An
extensive
study
has
been
conducted
on
effect
initial
reagent
concentration,
power,
temperature,
reaction
time,
surfactant
presence
size
morphology
nanocoordination
polymers.
Analyses
compounds
performed
using
scanning
electron
microscopy
(SEM),
powder
(PXRD),
FT-IR
spectroscopy,
CHNS
elemental
analysis.
By
thermal
gravimetry
(TGA-DTA),
stability
nanostructures
examined
compared
that
structures.
A
Hirschfeld
surface
two-dimensional
fingerprint
diagram
analyze
intermolecular
interactions
Photocatalytic
degradation
methylene
blue
investigated
1a
2b_2,
which
represent
synthetic
compounds.
Calculation
band
gap
Tauc
(based
DRS
results).
During
optimal
conditions
C0
0.6
mg
L1,
pH
7,
irradiation
time
60
min,
maximum
photodegradation
efficiencies
(MB)
observed
for
2b_2.
In
terms
efficiency,
1a's
reusability
73.5
%
first
cycle
70.6
fifth,
while
2b_2's
88.2
81.7
fifth.
These
materials
can
be
multiple
photocatalytic
cycles
based
results
obtained.
Journal of The Electrochemical Society,
Год журнала:
2024,
Номер
171(8), С. 087516 - 087516
Опубликована: Авг. 1, 2024
Due
to
the
important
role
of
hydrogen
peroxide
(H
2
O
)
in
biological
systems
and
its
wide
range
practical
applications,
development
efficient
electrochemical
H
sensors
has
become
a
highly
attractive
research
area.
Herein,
we
reports
synthesis
fabrication
zinc-based
coordination
polymer
[Zn(bim)(L1)(Cl)]n
(
CP-a
):
[bim
=
1-benzylimidazole,
L1
terephthalic
acid]
on
modified
carbon
paste
electrode
/CPE)
for
detection
.
The
surface
morphology
CP-a/
CPE
was
confirmed
by
field
emission
scanning
electron
microscopy.
Electrochemical
sensing
features
were
evaluated
cyclic
voltammetry
chrono-amperometry.
linear
at
potential
−0.5
V
based
/CPE
0.001
mM–60
mM,
with
low
limit
(LOD)
0.0004
mM.
effect
interfering
species
reduction
peak
current
response
shows
minor
change
signals
(>5%).
as-synthesized
sensor
exhibited
reproducibility
stability.
electrocatalytic
activity
good
performance
imply
that
metal-based
polymers
are
candidates
fabricating
sensors.
