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:
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.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(16)
Published: Jan. 12, 2024
Stimuli-responsive
circularly
polarized
luminescence
(CPL)
materials
show
great
promise
in
applying
information
encryption
and
anticounterfeiting.
Herein,
light-driven
CPL
sign
inversion
is
achieved
by
combining
a
photoresponsive
achiral
negative
dichroic
dye
(KG)
static
positive
(NR)
as
dopants
at
the
0.5:0.5
weight
ratio
into
cholesteric
liquid
crystal
(CLC)
host.
The
side
chains
of
KG
undergo
trans/cis
isomerization
after
365
nm
UV
light
irradiation,
leading
to
dichroism
(S
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(32)
Published: June 7, 2024
Abstract
Photochromic
molecules
have
remarkable
potential
in
memory
and
optical
devices,
as
well
driving
manipulating
molecular
motors
or
actuators
many
other
systems
using
light.
When
photochromic
are
introduced
into
carbon
nanomaterials
(CNMs),
the
resulting
hybrids
provide
unique
advantages
create
new
functions
that
can
be
employed
specific
applications
devices.
This
review
highlights
recent
developments
diverse
CNMs.
CNMs
also
introduced.
The
fundamentals
of
different
discussed,
including
design
principles
types
interactions
between
via
covalent
non‐covalent
bonding
such
π−π
stacking,
amphiphilic,
electrostatic,
hydrogen
bonding.
Then
properties
CNMs,
e.g.,
photopatterning,
fluorescence
modulation,
actuation,
photoinduced
surface‐relief
gratings,
their
energy
storage
(solar
thermal
fuels,
photothermal
batteries,
supercapacitors),
nanoelectronics
(transistors,
junctions,
photo‐switchable
conductance,
electron
transfer),
sensors,
bioimaging
highlighted.
Finally,
an
outlook
on
challenges
opportunities
future
is
presented.
discusses
a
vibrant
interdisciplinary
research
field
expected
to
stimulate
further
nanoscience,
advanced
nanotechnology,
intelligently
responsive
materials,
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: May 23, 2024
Abstract
Inspired
by
intriguing
color
changeable
ability
of
natural
animals,
the
design
and
fabrication
artificial
mechanochromic
materials
capable
changing
colors
upon
stretching
or
pressing
have
attracted
intense
scientific
interest.
Liquid
crystal
(LC)
is
a
self‐organized
soft
matter
with
anisotropic
molecular
alignment.
Due
to
sensitivity
various
external
stimulations,
LC
has
been
considered
as
an
emerging
appealing
responsive
building
block
construct
intelligent
advanced
devices.
Recently,
becoming
hot
topic
in
multifields
from
flexible
skins
visualized
sensors
smart
biomimetic
In
this
review,
recent
progress
LCs
comprehensively
summarized.
Firstly,
mechanism
functionalities
introduced,
followed
preparation
functional
based
on
LCs.
Then
applications
are
provided.
Finally,
conclusion
outlooks
field
given.
This
overview
hoped
provide
inspiration
for
scientists
engineers
multidisciplines
including
science,
elastomers,
chemistry,
physical
science.
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
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(7), P. 9323 - 9332
Published: Feb. 9, 2024
Chiral
luminescent
liquid
crystals
have
attracted
widespread
attention
from
researchers
due
to
their
unique
advantages
in
constructing
circularly
polarized
(CPL)
materials
with
large
asymmetry
factor
(glum)
values.
However,
how
effectively
prepare
nondoped
CPL
chiral
remains
a
challenge.
In
this
article,
we
developed
an
effective
and
universal
method
crystal
materials.
To
achieve
our
strategy,
copolymerized
monomer
M0Mt
α-cyanostilbene-based
monomers
MmPVPCN
(m
=
6,
8,
10)
bearing
different
flexible
spacer
lengths
obtain
series
of
copolymers
poly(MmPVPCN(x)-co-M0Mt(y)).
Under
the
induction
component,
α-cyanostilbene
component
assembles
form
crystals.
Meanwhile,
also
exhibits
aggregation-induced
emission
enhancement
characteristics.
Therefore,
help
selective
reflection
effect
crystals,
copolymer
films
can
emit
efficient
CPL.
For
poly(M8PVPCN(0.85)-co-M0Mt(0.15)),
glum
solid
luminescence
quantum
yield
−2.61
×
10–2
25.04%,
respectively.
addition,
by
altering
chemical
structure
copolymers,
phase
be
controlled,
thereby
regulating
properties.
