Enhancement of Photoluminescence Quantum Yield of Silver Clusters by Heavy Atom Effect
Small,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 3, 2025
Abstract
Many
ligand‐protected
metal
clusters
exhibit
phosphorescence
at
room
temperature.
However,
strategies
for
improving
their
quantum
yield,
a
critical
parameter
of
performance,
remain
poorly
developed.
In
contrast,
fluorescent
dyes
are
commonly
modified
by
introducing
heavy
atoms,
such
as
iodine
(I),
to
enhance
intersystem
crossing
in
the
excited
state,
thereby
harnessing
atom
effect
increase
efficiency.
this
study,
pair
silver
(Ag)
is
successfully
synthesized
with
internal
cavities
encapsulating
anions
(X
z
−
),
namely
sulfide
ions
(S
2−
)
or
iodide
(I
which
significantly
differ
atomic
number
each
other.
Single‐crystal
X‐ray
diffraction
and
nuclear
magnetic
resonance
spectroscopy
revealed
that
resulting
Ag
composed
X@Ag
54
S
20
(thiolate)
(sulfonate)
m
,
where
(X,
=
(S,
12)
(I,
11).
photoelectron
atoms
these
compounds
mixed‐valence
state.
Furthermore,
experiments
on
photoluminescence
central
anion
induced
an
heavy‐atom
similar
observed
organic
dyes.
As
result,
yield
became
16
times
higher
when
replaced
I
atom.
Язык: Английский
A nearly perfect icosahedral Ir@Au12 superatom with superior photoluminescence obtained by ligand engineering
Chemical Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
A
nearly
perfect
icosahedral
Ir@Au
12
superatom
was
formed
using
a
diphosphine
ligand
with
benzo[
b
]phosphindole
rings.
The
exhibited
bright
photoluminescence
due
to
the
symmetric
structure
rigidified
core.
Язык: Английский
Revisiting protein protected gold and silver nanoclusters: Excited state dynamics and long-lived emission
Nanoscale,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Time-resolved
luminescence
spectroscopy
unveiled
the
distinct
excited
state
dynamics
of
protein-conjugated
gold
and
silver
nanoclusters.
Язык: Английский
Synthesis of Au13Cu4 Nanoclusters with Isomeric Mercaptobenzoic Acid Ligands
Nano Letters,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 19, 2025
Au-based
alloy
nanoclusters
(NCs)
have
attracted
significant
interest
due
to
their
unique
properties,
including
chirality,
magnetism,
luminescence,
and
size-dependent
characteristics.
Despite
promising
potential,
further
efforts
are
required
explore
a
broader
range
of
ligands
NCs
fully
unlock
capabilities.
Here,
[Au13Cu4(MBA)12]3-
(MBA
=
mercaptobenzoic
acid)
were
synthesized
from
[Au25(MBA)18]-
seed
using
MBA
isomers
as
etching
agents.
The
fragmented
reassembled
with
Cu
ions
into
NCs.
This
process,
driven
by
ligands,
was
monitored
time-dependent
electrospray
ionization
mass
spectrometry
optical
spectroscopies.
Theoretical
calculations
suggested
tetrahedral
geometry
for
the
stabilized
interligand
interactions.
Notably,
quantum
yield
[Au13Cu4(p-MBA)12]3-
increased
∼14-fold
compared
that
[Au25(p-MBA)18]-
These
results
offer
novel
approach
synthesizing
water-soluble,
size-focused
NCs,
opening
up
investigation
new
gold
clusters
enhanced
properties
applications.
Язык: Английский