Angewandte Chemie,
Год журнала:
2024,
Номер
136(41)
Опубликована: Июль 19, 2024
Abstract
The
introduction
of
precise
pore
defects
into
nanocarbon
structures
results
in
the
emergence
distinct
physicochemical
characteristics.
However,
there
is
a
lack
research
on
non‐planar
chiral
nanographene
involving
defects.
Herein,
we
have
developed
two
analogues
to
π‐extended
pentadecabenzo[9]helicene
(
EP9H
)
containing
embedded
Each
molecules,
namely
extended
dodecabenzo[7]helicene
ED7H
;
1
or
nonabenzo[5]helicene
EN5H
2
),
exhibits
dual‐state
emission.
Significantly,
value
|
g
lum
exceptionally
high
at
1.41×10
−2
solution
and
B
CPL
as
254
M
−1
cm
.
In
PMMA
film,
8.56×10
−3
,
powder
it
5.00×10
This
study
demonstrates
that
molecules
with
exhibit
emission
properties
while
maintaining
quite
good
luminescence
properties.
It
was
distinguished
from
aggregation‐caused
quenching
(ACQ)
effect
corresponding
without
defect.
Incorporating
also
simplifies
synthesis
process
enhances
solubility
resulting
product.
These
findings
suggest
can
be
viable
approach
improve
molecules.
Advanced Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 28, 2025
Abstract
Chiral
supramolecular
polymers
with
stimuli‐responsive
circularly
polarized
luminescence
(CPL)
are
highly
desirable
for
smart
flexible
optoelectronic
devices,
but
remain
rarely
reported.
Here,
a
simple
solvent‐free
polymerization
preparing
chiral
polyurethanes
is
presented
by
in
situ
induced
self‐assembly
strategy,
using
cellulose
nanocrystals
(CNCs)‐based
isocyanate
prepolymers
and
macromolecular
polyols
as
precursors,
achieving
precise
control
over
polymer
chain
assembly
spot‐like
arrangement.
More
importantly,
further
incorporating
π‐conjugated
luminescent
dihydroxynaphthalene
molecule,
CPL‐active
polyurethane
films
feather‐like
nanostructures
constructed,
which
promote
the
ordered
arrangement
of
CNCs‐based
segments
due
to
increased
spatial
resistance.
The
π─H
bond
network
between
CNCs
urethane‐linked
benzene
rings
drives
self‐assembly,
enabling
higher‐level
amplification
enhanced
fluorescence.
Interestingly,
prepared
fluorescent
display
multimodal
chiroptical
stimuli
responsiveness
under
various
stimuli,
such
temperature,
solvent
polarity,
pH,
light,
sensitivity
network.
This
work
offers
new
insights
into
designing
significant
potentials.
Chemistry of Materials,
Год журнала:
2024,
Номер
36(5), С. 2508 - 2519
Опубликована: Фев. 28, 2024
It
is
challenging
to
precisely
regulate
the
chirality
transmission
of
metal–organic
supramolecular
polymers
(MOSPs)
due
a
poor
understanding
nucleation
pathways
during
highly
dynamic
and
complex
self-assembly
process.
This
work
reports
circularly
polarized
luminescence
(CPL)
switching
pyridine
Schiff-base
cholesterol
(2-PMPCC)
ZnCl2-based
MOSPs
with
inversion
CPL
through
competition
solvent-assisted
thermal
nucleation.
In
p-xylene,
metal
2-PMPCC·ZnCl2
conducted
assembled
into
metastable
twisted
nanoribbons
Agg
I
right-handed
at
490
nm,
which
further
reverted
thermodynamic
II
left-handed
nm.
contrast,
nanosheet-like
III
460
nm
in
ethanol.
Based
on
nucleation,
significant
morphology
were
achieved
by
tuning
temperature
cosolvents
p-xylene
revealed
transfer
transformation
regulated
solvent-dependent
MOSPs,
providing
an
efficient
approach
control
tunable
performances
for
design
chiroptical
materials.
Chemistry of Materials,
Год журнала:
2024,
Номер
36(8), С. 3745 - 3753
Опубликована: Апрель 4, 2024
An
amphiphilic
boron-azadipyrromethene
(aza-BODIPY)
dye
(R)-1
bearing
two
chiral
hydrophobic
side
chains
was
synthesized,
and
its
supramolecular
assembly
properties
were
investigated
in
detail.
The
UV/vis
absorption,
emission,
CD
spectroscopic
studies
indicated
the
pathway
complexity
aggregation
process
of
(R)-1.
In
mixed
solvent
MeOH/H2O,
first
formed
kinetically
favored
metastable
aggregates
(Agg.
I)
upon
cooling
solution,
which
could
slowly
transform
into
thermodynamically
more
stable
aggregates,
i.e.,
Agg.
II
by
keeping
solution
I
at
appropriate
temperature.
Further
kinetic
analysis
to
transformation
that
an
off-pathway
aggregate
species.
displayed
distinct
spectral
morphological
characteristics.
While
a
broad
absorption
band
between
656
707
nm
observed
for
I,
exhibited
extremely
narrowed
799
emission
804
J-aggregates.
Moreover,
AFM
TEM
revealed
spherical
nanoparticles
had
morphology
helical
nanoribbons.
further
chiroptical
studies,
thin
film
J-aggregated
circularly
polarized
luminescence
with
maximum
g-factor
−4.7
×
10–2.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 28, 2024
Constructing
circularly
polarized
luminescence
(CPL)
materials
that
exhibit
dynamic
handedness
inversion
and
emissive
color
modulation
for
multimodal
information
encryption
presents
both
a
significant
challenge
compelling
opportunity.
Here,
we
have
developed
pyridinethiazole
acrylonitrile-cholesterol
derivative
(Z-PTC)
exhibits
wavelength-dependent
photoisomerization
photocyclization,
enabling
in
supramolecular
assemblies
with
decent
CPL
activity.
Coordination
Ag
Herein,
thermally
responsive
reversible
chiral
supramolecules
are
reported,
constructed
by
the
chirality
transfer
from
tripeptides
to
achiral
network
supramolecular
organic
frameworks
(SOF)
based
on
configurationally
stepping
confinement,
which
displayed
not
only
highly
selective
but
also
efficient
enhanced
near-infrared
(NIR)
luminescence.
Taking
advantage
of
macrocyclic
CB[8]
separately
encapsulated
two
kinds
tetracationic
bis(phenothiazines)
derivatives
(G1,
G2)
at
2:1
stoichiometric
form
2D
SOFs,
efficiently
enhancing
12.6
fold
NIR
luminescence
and
blueshifted
705
680
nm
for
G1,
redshifted
695
710
G2,
respectively.
Uncommonly,
tripeptide
coassembled
with
noncovalent
(G1/CB[8]
or
G2/CB[8])
different
opposite
circular
dichroism
signals
binding
modes
affinity,
achieving
assemblies
further
fluorescence
up
46.2
times
quantum
yield
(QY)
increased
0.71%
10.29%
G2/CB[8],
showing
tunable
under
thermal
stimulus.
Therefore,
current
research
has
achieved
controllable
SOFs
enhancement
fluorescence,
is
successfully
applied
in
logic
gates,
information
encryption,
cell
imaging.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(27)
Опубликована: Май 4, 2024
Abstract
Circularly
polarized
luminescence
(CPL)‐active
materials
are
increasingly
recognized
for
their
potential
applications
such
as
3D
imaging,
data
storage,
and
optoelectronic
devices.
Typically,
CPL
have
required
high‐energy
(HE)
photons
excitation
to
emit
low‐energy
(LE)
circularly
light,
a
process
known
downshifting
(DSCPL).
However,
the
emergence
of
upconverted
(UCCPL),
where
absorption
multi
LE
results
in
emission
single
HE
photon
with
circular
polarization,
has
recently
attracted
considerable
attention.
This
minireview
highlights
intricate
relationship
between
upconversion
phenomena.
During
upconversion,
dissymmetry
factor
(
g
lum
)
value
can
be
improved
certain
systems.
Additionally,
integration
both
upconversion‐downshifting‐synergistic
systems
offers
avenues
dual‐excitation
or
dual‐emission
functionalities.
More
detail,
emerging
UCCPL
based
on
various
mechanisms
synergy
DSCPL
introduced.
several
examples
that
demonstrate
presented
highlight
future
opportunities.
