Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(35), P. 24561 - 24569
Published: Aug. 20, 2024
The
long-range
supramolecular
interactions
in
liquid
crystals
(LCs)
can
be
used
to
amplify
and
subsequently
propagate
microscopic
structural
changes
into
macroscopic
events.
Here,
we
report
on
a
systematic
structure–property
analysis
using
16
chiral
photoswitchable
dopants
composed
of
bistable
hydrazones
isosorbide
moieties.
Our
findings
showcase
the
relationship
between
dopant's
structure
its
helical
twisting
power
(β),
hence,
photophysical
properties
host
LC.
We
show
that
an
increase
hydrazone
CNNH
dihedral
angle
results
β
value,
while
alkoxy
chains
do
not
lead
such
increase.
These
contradict
established
rules
thumb,
stating
rigidity
long
alky
are
needed
for
high
values.
also
found
position
substitution,
whether
at
2′
or
5′
positions
unit,
attachment
unit
rotor
stator
phenyl
units
have
negative
positive
additive
effects
either
decrease
made
us
hypothesize
unsymmetrically
functionalized
should
result
large
Δβ
values,
which
corroborated
experimentally.
Moreover,
fluorine-functionalized
dopant
resulted
higher
overall
most
likely
because
π–π
interactions.
Finally,
were
modulating
locking
reflective
LC
films,
yielding
multicolor
canvases
reflect
light
from
ultraviolet
infrared
range
(i.e.,
manipulation
up
ca.
1500
nm
reflected
light).
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(11), P. 7524 - 7532
Published: March 7, 2024
Chiral
aluminum
oxo
clusters
(cAlOCs)
are
distinguished
from
other
classes
of
materials
on
account
their
abundance
in
the
earth's
crust
and
potential
for
sustainable
development.
However,
practical
synthesis
cAlOCs
is
rarely
known.
Herein,
we
adopt
a
synergistic
coordination
strategy
by
using
chiral
amino
acid
ligands
as
bridges
auxiliary
pyridine-2,6-dicarboxylic
chelating
successfully
isolate
an
extensive
family
cAlOCs.
They
integrate
molecular
chirality,
absolute
helicity,
intrinsic
hydrogen-bonded
topology.
Moreover,
they
have
structural
characteristics
one-dimensional
channels
replaceable
counteranions,
which
make
them
well
combined
with
fluorescent
dyes
circularly
polarized
luminescence
(CPL).
The
dissymmetry
factor
(glum)
up
to
10–3
order
comparable
several
noble
metals,
revealing
enormous
low-cost
materials.
We
hope
this
work
will
inspire
new
discoveries
field
chirality
provide
opportunities
constructing
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 17, 2025
Abstract
Azobenzene‐based
chiral
photoswitches
are
widely
used
as
photoresponsive
dopants
in
cholesteric
liquid
crystals
(CLCs)
due
to
their
ability
dynamically
tune
supramolecular
helices
and
have
attracted
considerable
attention
recent
years.
However,
a
challenge
for
application
is
the
thermal
instability
of
Z
‐isomers,
causing
photoaddressed
images
be
thermally
erased
at
room
temperature
within
few
hours.
Here
series
new
binaphthylazopyrazole
reported,
with
good
bidirectional
photoconversions
tunable
half‐lives
up
two
months
because
incorporated
pyrazole
ring
T‐shaped
isomer
conformation.
By
co‐doping
these
switches
photoinsensitive
dopant
S5011
into
crystal
host
E7,
CLCs
high
stability
reflective
color
modulation
obtained.
Specifically,
tuning
across
entire
visible
region
achieved
colorful
can
retained
dark
least
1
week.
In
addition,
large
helical
twisting
power
variation,
handedness
inversion
under
365
nm
light
irradiation
also
observed.
These
results
provide
guidance
expanding
diversity
heteroaryl
azo
demonstrate
great
potential
developing
stable
RGB
colors.
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
12(19)
Published: April 30, 2024
Abstract
Functional
materials
that
exhibit
circularly
polarized
luminescence
(CPL)
have
shown
immense
potential
in
applications
such
as
3D
optical
displays
and
advanced
information
encryption.
However,
facile
efficient
regulation
of
the
multiple
emission
properties
chiral
systems
has
remained
a
challenge
due
to
scarcity
suitable
complexity
systems.
Herein,
CPL
platform
is
fabricated
by
helical
co‐assembly
an
aldehyde‐functionalized
fluorane
dye
(Rhodol‐CHO,
6′‐(diethylamino)‐3′‐hydroxy‐3‐oxo‐3H‐spiro[isobenzofuran‐1,9′‐xanthene]‐4′‐carbaldehyde)
liquid
crystals,
which
can
efficiently
combine
stimuli‐responsive
characteristics
high
activity.
By
introducing
acid,
base,
compounds
containing
primary
amino
(─NH
2
)
groups,
property
system
be
easily
modified.
The
obtained
apparent
asymmetry,
with
g
lum
values
reaching
0.54–0.75).
Further,
these
modules
are
successfully
applied
multi‐mode
encryption,
highlighting
their
practical
utility.
Therefore,
this
study
presents
novel
strategy
for
developing
diverse
behaviors
based
on
simple‐designed
platform,
advancing
further
materials.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 16, 2024
Abstract
Circularly
polarized
luminescent
(CPL)
materials
have
garnered
tremendous
attention
owing
to
their
expanded
optical
properties
beyond
emission
wavelength
and
intensity.
Among
these,
the
emerging
circularly
organic
ultralong
room‐temperature
phosphorescence
(CP‐OURTP)
materialsdemonstrating
elegant
distinct
features
are
of
significant
importance
for
extended
lifetime,
which
represent
a
novel
frontier
in
research
with
promising
scientific
technological
applications
across
diverse
fields.
This
review
systematically
outlines
traditional
strategies
achieve
CP‐OURTP
including
crystals,
copolymerization,
host–guest
doping,
combination
copolymerization
spinning
twisting
technology,
supramolecular
polymer
assembly.
Importantly,
recent
progress
chiral
soft
materials,
such
as
liquid
crystals
(LCs)
involving
lyotropic
LCs
(cellulose
nanocrystals,
CNCs)
thermotropic
(cholesteric
LC
elastomers),
is
showcased.
Finally,
practical
summarized,
concludes
perspectives
on
current
challenges
future
opportunities
materials.
aims
inspire
further
innovations
fabrication
advanced
enrich
applications.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 2, 2024
Chiral
liquid
crystal
supramolecular
assembly
provides
an
ideal
strategy
for
constructing
excellent
circularly
polarized
luminescence
(CPL)
materials.
However,
the
chirality
transfer
in
chiral
crystals
normally
occurs
at
two
levels
from
configurational
to
phase
chirality.
The
more
precise
and
of
transmission
are
fascinating
but
remain
challenging.
present
work
reports
first
success
three-level
amplification
configurationally
point
small
molecules
conformationally
helical
polymers
finally
cholesteric
composed
nonfluorescent
(P46)
nematic
crystals.
Noticeably,
twisting
power
P46
is
five-fold
larger
than
its
monomer.
Full-color
white
CPL
with
maximum
dissymmetry
factor
up
1.54
photoluminescence
quantum
yield
63.8%
realized
utilizing
combined
selective
reflection
mechanism.
Also
significantly,
electrically
stimuli-responsive
switching
device
as
well
anti-counterfeiting
security,
information
encryption,
logic
gate
applications
developed.
This
study
deepens
understanding
across
different
hierarchical
levels.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 19, 2024
Abstract
Molecular
photoswitches
can
undergo
isomerization
under
light
exposure,
making
them
uniquely
attractive
for
high
spatiotemporal
resolution
remote
control
of
biological
functions.
Visible
and
near‐infrared
(NIR)
light,
with
their
low
energy
consumption,
safety,
strong
tissue
penetration,
are
particularly
suitable
applications.
Therefore,
developing
visible‐
NIR
light‐driven
molecular
use
is
great
significance.
This
review
introduces
the
most
common
presents
state‐of‐art
applications
in
bioimaging,
biosensing,
drug
delivery,
photocontrolled
cancer
phototherapy,
photopharmacology.
The
opportunities
challenges
future
development
outlined.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 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
