Inorganic Chemistry,
Journal Year:
2024,
Volume and Issue:
64(1), P. 192 - 201
Published: Dec. 19, 2024
Trivalent
lanthanide
ions
have
emerged
as
promising
candidates
for
precise
and
remote
temperature
sensing.
Among
them,
Pr3+-based
luminescent
thermometers
remain
underexplored,
particularly
those
operating
in
the
near-infrared
(NIR)
spectral
region.
This
work
presents
synthesis
thorough
characterization
of
a
novel
coordination
polymer,
{[Pr2IIIPt3II(CN)12(4,4′-bpyO2)4(H2O)6]·4H2O}n
(1),
rare
example
Pr3+
thermometry.
Coordination
between
ions,
cyanido-bridged
Pt2+
centers,
4,4′-bpyO2
ligands
enables
efficient
energy
transfer,
producing
luminescence
visible
regions.
The
polymer
demonstrates
distinct
temperature-dependent
over
wide
range
(12–386
K),
with
relative
thermal
sensitivities
≅1%·K–1
minimum
uncertainty
0.2
K.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 24, 2025
Gold
nanoclusters
emitting
in
the
second
biological
window
(NIR-II-AuNCs)
have
gained
significant
interest
for
their
potential
deep-tissue
bioimaging
and
biosensing
applications
due
to
partial
transparency
reduced
autofluorescence
of
tissues
this
spectral
range.
However,
limited
understanding
how
environment
affects
luminescent
properties
might
hinder
use
biosensing.
In
study,
we
investigated
emission
NIR-II-AuNCs
when
interacting
internalizing
into
live
cells
including
macrophages,
fibroblasts,
cancer
cell
lines,
revealing
substantial
alterations
luminescence.
A
systematic
comparison
between
control
vitro
experiments
concluded
that
disruption
surface
ligands
is
main
factor
responsible
these
alterations.
within
cellular
environments
may
also
be
influenced
by
other
interactions,
aggregation
or
complexation
with
proteins.
Furthermore,
corroborated
spectroscopic
modifications
at
vivo
level,
providing
additional
evidence
environmental
sensitivity
NIR-II-AuNCs.
The
results
obtained
study
contribute
a
deeper
luminescence
mechanisms
living
are
crucial
optimization
as
reliable
tools
imaging
diagnostics.
Advanced NanoBiomed Research,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 27, 2025
Lanthanide‐based
luminescence
nanothermometry
has
demonstrated
unprecedented
advantages
in
the
development
of
nanotheranostic
platforms
for
potential
medical
applications,
yet
despite
exponential
research
progress
and
great
enthusiasm
across
various
related
disciplines,
a
swift
bench‐to‐bedside
translation
seems
to
be
still
out
reach.
This
is
predominantly
fundamental
issues
at
preclinical
stage,
such
as
complex
nanomaterials
design,
incomplete
optimization,
fragmented
characterization,
insufficient
validation
nanothermometer
performance
physiological
environments.
The
main
impediments
currently
are
important
biophysicochemical
that
must
addressed
comprehensively,
first
foremost
available
vitro
systems,
before
going
on
vivo
investigations.
review
outlines
critical
perspective,
well
route
suggestions
underexplored
aspects
address
significantly
minimize
existing
translational
gap.
Communications Chemistry,
Journal Year:
2025,
Volume and Issue:
8(1)
Published: May 3, 2025
Examples
of
molecular
complexes
acting
as
thermometers
operating
at
room
temperature
in
near
infrared
region
are
scarce,
therefore
this
work
showcases
the
anti-thermal
quenching
effect
on
neodymium(III)
working
biological
windows
within
physiological
range.
A
mononuclear
complex,
[Nd(L)(NO3)3]
(1Nd),
where
L
is
a
macrocyclic
ligand,
was
synthesized
and
used
precursor
to
develop
two
novel
species:
dinuclear,
[(Nd(L)(NO3))2(µ-BDC)](NO3)2·H2O
(2Nd),
linked
by
1,4-benzenedicarboxylate
(BDC),
hexameric,
[(Nd(L))(µ-BTC)(H2O)]6·35H2O
(6Nd),
with
1,3,5-benzenetricarboxylate
(BTC).
Thermometric
properties
were
studied
range
(292-332
K),
utilizing
804
nm
laser
excitation
(first
window)
monitoring
emissions
second
window
(908,
1065,
1340
nm)
associated
4F3/2
→
4I9/2,
4I11/2,
4I13/2
transitions,
respectively.
Among
complexes,
hexamer
6Nd
exhibited
exceptional
performance,
Sr
2.4%K-1
293
K,
when
luminescence
intensity
ratio
(LIR)
Stark
components
4I11/2
emission
used,
positioning
it
high-performance
NdIII-based
thermometer.
All
displayed
behavior,
surpassing
current
molecular-based
near-infrared
region.
Theoretical
calculations
using
complete
active
space
self
consistent
field
(CASSCF)
Boltzmann
population
models
between
Kramers
doublets
level
performed
rationalize
behavior.
Chemistry - An Asian Journal,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 6, 2025
Abstract
This
study
investigates
the
effects
of
Nd
3
⁺
doping
and
thermal
annealing
(at
250,
500,
650,
800
°C)
on
structural
luminescent
properties
⁺‐doped
Na₂Ti₆O₁₃
nanocrystals
(NCs),
with
a
focus
their
potential
for
sensing
applications.
The
optimal
concentration
was
found
to
be
0.5
wt%
⁺,
where
luminescence
intensity
decreases
higher
concentrations
due
quenching.
Thermal
significantly
enhances
both
crystallinity
NCs,
most
notable
improvements
observed
up
500
°C.
However,
heating
beyond
650
°C
induces
phase
transition
from
TiO₂,
which
impacts
NCs'
properties.
performance
evaluated
using
fluorescence
ratio
(FIR)
between
emissions
at
1060
nm
1340
across
temperature
range
300–343K,
revealing
highest
relative
sensitivity
(S
r
)
3.28%
K⁻¹
in
sample
annealed
250
For
applications
requiring
high
emission
intensity,
NCs
exhibited
figure
merit,
combining
excellent
S
,
making
them
ideal
nanothermometry.
Notably,
excitation
(808
nm)
wavelengths
(900,
1060,
fall
within
biological
tissue
windows,
suggesting
significant
nanothermometry
underscores
critical
role
optimizing
conditions
enhance
offering
new
insights
into
use
advanced
medical
fields.
Journal of Materials Chemistry B,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
Capping
of
lanthanide-based
nanoparticles
with
Gum
Arabic
improved
their
dispersibility
in
biologically
relevant
media,
chemical
as
well
optical
stability,
and
biocompatibility
towards
cells
zebrafish.
