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).
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(48)
Published: Aug. 31, 2023
The
development
of
chiral
optical
active
materials
with
switchable
circularly
polarized
luminescence
(CPL)
signals
remains
a
challenge.
Here
an
azoarene-based
molecular
switch,
(S,
R,
S)-switch
1
and
(R,
R)-switch
2,
are
designed
prepared
(R)-binaphthyl
azo
group
as
photosensitive
moiety
two
(S)-
or
fluorescent
molecules
opposite
the
same
handedness
moieties.
Both
switches
exhibit
reversible
trans/cis
isomerization
when
irradiated
by
365
nm
UV
light
520
green
in
solvent
liquid
crystal
(LC)
media.
In
contrast
control
switch
is
doped
into
nematic
LCs,
polarization
inversion
switching-off
CPL
achieved
resultant
helical
superstructure
upon
irradiation
light,
respectively.
Meanwhile,
fluorescence
intensity
system
basically
unchanged
during
this
switching
process.
particular,
these
variations
could
be
recovered
after
heating,
realizing
true
sense
switching.
Taking
advantage
unique
switching,
proof-of-concept
for
"a
dual-optical
information
encryption
system"
based
on
above
material
demonstrated.
Deleted Journal,
Journal Year:
2023,
Volume and Issue:
2(1)
Published: Dec. 11, 2023
Abstract
Compared
with
traditional
rigid
actuators,
soft
actuators
exhibit
a
large
number
of
advantages,
including
enhanced
flexibility,
reconfigurability,
and
adaptability,
which
motivate
us
to
develop
artificial
widespread
applications.
Soft
MXene
nanomaterials
are
regarded
as
highly
promising
candidates
for
advancing
the
development
bioinspired
robotics
consequence
their
unprecedented
physicochemical
characteristics,
such
high
electronic
conductivity,
thermal
photothermal
conversion
capability,
abundant
surface
functional
groups.
Herein,
comprehensive
overview
recent
advancement
extensive
applications
from
perspective
bioinspiration
is
provided.
First,
synthetic
methods
properties
briefly
summarized.
Subsequently,
(including
photoresponsive
electroresponsive
chemoresponsive
actuators)
sequentially
investigated
focus
on
fabrication
approaches,
actuation
properties,
underlying
mechanisms,
At
end,
future
challenges
opportunities
rapid
discussed.
Abstract
Polymer-based
circularly
polarized
luminescence
(CPL)
materials
with
the
advantage
of
diversified
structure,
easy
fabrication,
high
thermal
stability,
and
tunable
properties
have
garnered
considerable
attention.
However,
adequate
precise
tuning
over
CPL
in
polymer-based
remains
challenging
due
to
difficulty
regulating
chiral
structures.
Herein,
visualized
full-color
is
achieved
by
doping
red,
green,
blue
quantum
dots
(QDs)
into
reconfigurable
phase
liquid
crystal
elastomers
(BPLCEs).
In
contrast
signal
observed
cholesteric
(CLCEs),
3D
cubic
superstructure
BPLCEs
induces
an
opposite
signal.
Notably,
this
effect
entirely
independent
photonic
bandgaps
(PBGs)
results
a
g
lum
value,
even
without
matching
between
PBGs
emission
bands
QDs.
Meanwhile,
lattice
structure
can
be
reversibly
switched
via
mechanical
stretching
force,
inducing
on-off
switching
signals,
these
variations
further
fixed
using
dynamic
disulfide
bonds
BPLCEs.
Moreover,
smart
systems
for
anti-counterfeiting
information
encryption
been
demonstrated,
suggesting
great
potential
BPLCEs-based
active
materials.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(12)
Published: Jan. 24, 2024
Abstract
Achieving
circularly
polarized
organic
ultralong
room‐temperature
phosphorescence
(CP‐OURTP)
with
a
high
luminescent
dissymmetry
factor
(g
lum
)
is
crucial
for
diverse
optoelectronic
applications.
In
particular,
dynamically
controlling
the
of
CP‐OURTP
can
profoundly
advance
these
applications,
but
it
still
unprecedented.
This
study
introduces
an
effective
strategy
to
achieve
photoirradiation‐driven
chirality
regulation
in
bilayered
structure
film,
which
consists
layer
soft
helical
superstructure
incorporated
light‐driven
molecular
motor
and
phosphorescent
(RTP)
polymer.
The
prepared
film
exhibits
emission
lifetime
805
ms
g
value
up
1.38.
Remarkably,
resulting
be
reversibly
controlled
between
0.6
1.38
over
20
cycles
by
light
irradiation,
representing
first
example
CP‐OURTP.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(26)
Published: April 10, 2024
Manipulation
of
periodic
micro/nanostructures
in
polymer
film
is
great
importance
for
academics
and
industrial
applications
anticounterfeiting.
However,
with
the
increasing
demand
on
information
security,
materials
time-dependent
features
are
urgently
required,
especially
material
where
same
can
appear
more
than
once
time
scale.
Here,
one
concise
strategy
to
realize
anticounterfeiting
"double-lock"
encryption
based
a
host-guest
system
proposed,
photoresponsive
azopolymer
as
host
liquid-crystalline
molecule
guest.
The
exhibits
tunable
mass
transport
pre-designed
by
tailoring
process
cis-to-trans
recovery
azo
groups
assembly
mesogenic
trans-isomers,
resulting
dynamic
structural
color
film.
Taking
advantage
this
extraordinary
feature,
has
been
achieved.
More
importantly,
each
state's
appearance
whole
be
modulated
changing
ratio.
Combining
manipulatable
unique
decoding
method,
stored
decrypted
correctly.
This
work
provides
an
unprecedented
approach
advanced
technology
higher
level
security
high-end
encryption.
Journal of the American Chemical Society,
Journal Year:
2023,
Volume and Issue:
145(9), P. 5545 - 5552
Published: Feb. 24, 2023
Controlling
molecular
chirality
by
external
stimuli
is
of
great
significance
in
both
fundamental
research
and
technological
applications.
Herein,
we
report
a
high-temperature
(384
K)
ferroelectric
Cu(II)
complex
whose
spontaneous
polarization
can
be
switched
associated
with
flipping
chirality.
In
this
two-dimensional
perovskite
structure,
the
inorganic
layer
separated
(NH3(CH2)2SS(CH2)2NH3)2+
organic
cations
skewed
chiral
conformation
(P-
or
M-helicity
an
individual
crystal).
As
stereodynamic
disulfide
bridge
determines
dipole
moment
along
polar
axis,
cation
converted
to
its
enantiomer
as
consequence
electric
field-induced
shift
S-S
moiety
relative
screw
axis
during
switching.
The
variation
examined
single-crystal
X-ray
diffraction
circular
dichroism
spectra.
simultaneous
switching
may
lead
novel
electronic
phenomena.
Deleted Journal,
Journal Year:
2023,
Volume and Issue:
1(2)
Published: Oct. 19, 2023
Abstract
The
increasing
demand
for
the
multidimensional
and
dynamic
control
of
light
has
spurred
development
stimuli‐responsive,
reconfigurable,
programmable
optical
systems.
Liquid
crystals
(LCs),
which
combine
liquid‐like
stimuli‐responsiveness
crystal‐like
orientational
ordering,
have
emerged
as
highly
appealing
soft
materials.
Owing
to
their
exceptional
performance
functionalities,
they
are
becoming
incredibly
important
materials
in
active
planar
optics
photonics.
Additionally,
silk
proteins,
luminescent
materials,
metasurfaces
exhibit
properties,
enabling
remarkable
multifunctional
applications.
This
review
focuses
on
advancements
stimuli‐responsive
including
LCs,
well
some
these
paired
with
LCs.
Their
attractive
tunable
applications
photonics,
along
great
potential
future
systems,
also
emphasized.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: June 26, 2024
Abstract
Photocontrollable
luminescent
molecular
switches
capable
of
changing
emitting
color
have
been
regarded
as
the
ideal
integration
between
intelligent
and
materials.
A
remaining
challenge
is
to
combine
good
luminescence
properties
with
wide
range
wavelength
transformation,
especially
when
confined
in
a
single
system
that
forms
well-defined
nanostructures.
Here,
we
report
π-expanded
photochromic
photoswitch,
which
allows
for
comprehensive
achievements
including
emission
variation
(240
nm
wide,
400–640
nm),
high
photoisomerization
extent
(95%),
pure
(<100
full
width
at
half
maximum).
We
take
advantageous
mechanism
modulating
self-assembly
intramolecular
charge
transfer
synthesis
construction,
further
realize
by
simple
photocontrol.
Based
on
this,
both
photoactivated
anti-counterfeiting
function
self-erasing
photowriting
films
are
achieved
fluorescence.
This
work
will
provide
insight
into
design
optical
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(16)
Published: Feb. 13, 2024
Abstract
Improving
the
photoswitching
rate
and
robustness
of
photochromic
molecules
in
bulk
solids
is
paramount
for
practical
applications
but
remains
an
on‐going
challenge.
Here,
we
introduce
octupolar
design
paradigm
to
develop
a
new
family
visible
light
organic
photoswitches,
namely
multi‐branched
Stenhouse
Adducts
(MOPSAs)
featuring
C
3
‐symmetrical
A
‐(D‐core)
architecture
with
dipolar
donor–acceptor
(D–A)
photochrome
each
branch.
Our
couples
multi‐dimensional
geometric
electronic
effects
MOPSAs
enable
robust
ultrafast
reversible
polymers.
Specifically,
optimal
MOPSA
(4
wt
%)
commercial
polyurethane
films
accomplishes
nearly
100
%
discoloration
6
s
under
∼
thermal‐recovery
17.4
at
60
°C,
while
acquired
kinetics
constants
are
3∼7
times
that
DASA
counterpart
1∼2
orders
magnitude
higher
than
those
reported
DASAs
Importantly,
MOPSA‐doped
polymer
sustain
500
discoloration/recovery
cycles
slow
degradation,
superior
existing
polymers
(≤30
cycles).
We
discover
multi‐dipolar
coupling
enables
enhanced
polarization
electron
delocalization,
promoting
rate‐determining
thermal
cyclization,
branched
non‐planar
geometry
induces
large
free
volume
facilitate
isomerization.
This
can
be
extended
spiropyran
or
azobenzene‐based
films.
The
performance
together
their
high‐yield
scalable
synthesis
facile
film
processing
inspires
us
explore
versatile
uses
as
smart
inks
labels
time‐temperature
indicators,
optical
logic
encryption
multi‐levelled
data
encryption.
Deleted Journal,
Journal Year:
2024,
Volume and Issue:
2(2)
Published: May 1, 2024
Abstract
Chirality
is
a
fundamental
property
in
nature,
which
essential
for
the
existence
and
survival
of
living
organisms.
Smart
responsive
chiroptical
materials
have
garnered
increasing
attention
due
to
their
unique
structural
characteristics
potential
applications.
Among
these,
azobenzene
(Azo),
as
typical
photoresponsive
chromophore,
plays
crucial
role
constructing
controlling
chiral
structures.
The
cis
‐
trans
isomerization,
liquid
crystallinity,
other
physicochemical
properties
allow
wide
range
tunability
stimuli‐responsive
materials.
Herein,
we
review
research
studies
field
chiral/achiral
Azo
building
blocks
multilevel
generation
well
switching,
summarize
recent
advances
on
applications
structures
from
micro
macro
levels.
Finally,
aim
provide
an
overview
challenges
new
opportunities
development
novel
smart
