Industrial & Engineering Chemistry Research,
Год журнала:
2024,
Номер
63(5), С. 2087 - 2099
Опубликована: Янв. 24, 2024
In
the
present
work,
we
report
sensing
of
silver
ions
by
yellow
fluorescence
turn-off
in
poly-o-phenylenediamine
(POPD)
solution
via
an
oxidative
mechanism.
Poly-o-phenylenediamine
was
synthesized
chemical
polymerization
using
ferric
chloride
as
oxidizing
agent
ethanol
solvent.
Proton
nuclear
magnetic
resonance
spectra
POPD
revealed
two
types
protons
corresponding
to
benzenoid
and
quinonoid
structures
semioxidized
POPD.
Fourier
transform
infrared
(FT-IR)
confirmed
presence
quinoid
absorption
bands
poly-o-phenylenediamine.
Powder
X-ray
diffraction
(PXRD)
patterns
sharp
peaks
at
2θ
values
10.54
26.70°,
indicating
crystalline
nature
polymer.
Matrix-assisted
laser
desorption/ionization-time-of-flight
(MALDI-TOF)
analysis
indicated
5–6
repeating
monomeric
units
has
intense
water,
its
emission
quenched
upon
oxidation
with
AgNO3.
Fluorescence
naked-eye
detection
studies
have
that
analyte
polymer
molar
ratio
10
obtained
for
quenching.
The
shown
reductive
turn-on
specific
redox
analytes,
reversible
cyclic
voltammogram
electrochemically
states,
particularly
negative
voltage
sweep
solution.
oxidized
nonfluorescent,
reappeared
adding
NaBH4
Thus,
may
provide
attractive
strategy
various
oxidizing/reducing
analytes
water.
Materials Advances,
Год журнала:
2024,
Номер
5(16), С. 6351 - 6367
Опубликована: Янв. 1, 2024
The
study
on
sulfur
quantum
dots
for
fluorescence
sensing
in
biological
and
pharmaceutical
samples
classifies
SQD
fluorescent
probes
into
two
categories:
of
samples.
ACS Sensors,
Год журнала:
2024,
Номер
9(6), С. 3262 - 3271
Опубликована: Май 29, 2024
As
trimethylamine
(TMA)
is
widely
used
in
agriculture
and
industry,
inhalation
of
TMA
can
cause
very
serious
negative
effects
on
human
health.
However,
most
the
current
gas
sensors
for
detecting
are
commonly
performed
at
high
temperatures
cannot
meet
market
needs.
Inspired
by
this,
we
prepared
imine
covalent
organic
frameworks
(TB-COF)
synthesized
from
two
monomers,
1,3,5-tris(4-aminophenyl)benzene
(TAPB)
1,3,5-benzotricarboxaldehyde
(BTCA),
using
acetic
acid
as
a
catalyst
room
temperature.
Based
three
were
sensitivity
testing,
namely,
TA,
BT,
TB-COF
sensors.
The
tested
15
different
gases
From
whole
data,
sensor
made
compositing
TA
BT
has
higher
(6845.9%)
to
500
ppm,
which
6.1
5.4
times
than
response
sensors,
respectively.
adsorbs
desorbs
controlled
23
s
cycle
with
low
detection
limit
28.6
ppb.
This
result
indicates
that
temperature
be
gas-sensitive
sensing
material
real-time
monitoring
TMA.
results
demonstrate
great
potential
COFs
development
application
provide
ideas
further
COFs-based
Methods and Applications in Fluorescence,
Год журнала:
2023,
Номер
11(3), С. 033002 - 033002
Опубликована: Март 23, 2023
The
wavelength-ratiometric
techniques
gain
increasing
popularity
in
fluorescence
probing
and
sensing
for
providing
inner
reference
to
output
signal
removing
instrumental
artefacts,
this
way
the
sensitivity
reliability
of
assays.
Recent
developments
demonstrate
that
such
approach
can
allow
achieving
much
more,
with
application
broad
range
novel
molecular
nanoscale
fluorophores
(luminophores),
exploring
whole
power
photophysical
photochemical
effects
using
extended
assay
formats.
Simplicity
detection
potentially
rich
content
data
allows
realizing
these
different
simplified,
miniaturized
multiplexing
devices.
latter
issues
are
discussed
Pt.
II
series.
Molecules,
Год журнала:
2024,
Номер
29(4), С. 823 - 823
Опубликована: Фев. 10, 2024
The
photophysical
and
sensory
properties
of
the
donor–acceptor
pyrazoloquinoline
derivative
(PQPc)
were
investigated
using
absorption,
steady-state,
time-resolved
fluorescence
measurements.
compound
synthesized
from
commercial,
readily
available
substrates
exhibited
absorptions
in
UV–Vis
range,
with
a
maximum
longwave
band
around
390
nm.
was
460–480
nm,
depending
on
solvent.
quantum
yield
between
12.87%
(for
n-hexane)
0.75%
acetonitrile)
decreased
increasing
solvent
polarity.
PET
mechanism
implicated
as
cause
quenching.
Divalent
ions
such
Zn2+,
Pb2+,
Cd2+,
Ca2+,
Mg2+,
Co2+,
Ni2+,
Cu2+
introduced
to
study
fluorescent
response
PQPc.
A
13-times
increase
observed
after
addition
Zn2+
ions.
Detailed
research
carried
out
for
PQPc-Zn2+
system
order
check
possibility
analytical
applications
PQPc
sensor.
detection
limit
set
at
value
level
1.93
×
10−7
M.
complexes
had
stoichiometry
1:1
binding
constant
859
M−1.
Biological
studies
showed
that
sensor
localized
cells
near
membrane
cytoplasm
may
be
used
detect
zinc
eukaryotic
cells.
