Liquid Crystals,
Год журнала:
2021,
Номер
48(10), С. 1365 - 1372
Опубликована: Апрель 8, 2021
A
series
of
pyridinium-based
chiral
ionic
liquid
crystals
(ILCs)
and
the
intermediated,
non-ionic
ones
(NILCs),
were
designed
synthesised.
All
ILCs
exhibit
enantiotropic
SmA
phases,
while
all
NILCs
cholesteric
phases.
In
addition,
few
SmC*
Due
to
Coulombic
force,
clearing
points
are
higher
than
those
corresponding
NILCs.
For
ILCs,
lateral
fluoro-substitution
not
only
decreases
points,
but
also
drives
formation
bilayer
molecular
packing
structures
at
smectic
Journal of Materials Chemistry C,
Год журнала:
2021,
Номер
9(46), С. 16672 - 16681
Опубликована: Янв. 1, 2021
Fabricated
polymer-stabilized
bistable
cholesteric
liquid
crystal
devices
show
a
stable
opaque
focal
conic
state
and
transparent
planar
without
any
energy
consumption
once
they
are
turned.
Liquid Crystals,
Год журнала:
2020,
Номер
48(9), С. 1309 - 1320
Опубликована: Дек. 22, 2020
A
series
of
star-shaped
liquid
crystal
(LC),
respectively,
based
on
phloroglucinol,
pentaerythritol
and
glucose
as
cores,
rod-shaped
molecules
(MeOSBAA,
MeSBAA
ClSBAA)
containing
a
schiff
base
mesogenic
mesogen
were
synthesised.
The
molecular
structures
confirmed
by
FT-IR
1H-NMR
techniques.
LC
textures
thermal
phase
behaviours
investigated
polarising
optical
microscopy
differential
scanning
calorimetry.
results
showed
that
MeOSBAA
ClSBAA
thermally
enantiotropic
crystals.
Three-arm
star
macromolecules
X-SBA3E
four-arm
X-SBA4E
found
to
display
nematic
crystals
behaviour.
While
the
five-arm
chiral
X-SBA5E
exhibited
phase.
Liquid Crystals,
Год журнала:
2023,
Номер
50(15), С. 2413 - 2433
Опубликована: Сен. 5, 2023
ABSTRACTIn
this
paper,
a
series
of
novel
liquid
crystal
units
(ASE-n,
n
=
4,
6,
8)
azo
Schiff
bases
with
sulphonic
acid
(-SO3H)
as
terminal
substituents
and
different
alkyl
chain
lengths
were
designed
synthesised.
Nine
star-shaped
macromolecules
central
groups
(ASE-P-n,
ASE-T-n,
ASE-G-n,
synthesised
by
esterification
three
base
phloroglucinol,
pentaerythritol
glucose.
The
structure
the
compounds
analysed
infrared
spectroscopy
1H
NMR.
results
showed
that
all
consistent
molecular
design.
properties
such
phase
transition
temperature
mesophase
range
characterised
POM
DSC.
effects
length
branched
degree
on
studied.
maximum
absorption
spectrum
compound
was
determined
UV-Vis
spectrophotometry.
photoisomerisation
reaction
also
Under
ultraviolet
light
(λ
365
nm)
irradiation,
effect
duration
cis-absorption
percentage
(-N=N-)
bond
in
studied.KEYWORDS:
AzoSchiff
basesstar-shaped
crystalsynthesis
Disclosure
statementNo
potential
conflict
interest
reported
author(s).Additional
informationFundingThis
work
financially
supported
Fundamental
Research
Fund
for
Central
Universities
[N180705004].
Liquid Crystals,
Год журнала:
2020,
Номер
47(12), С. 1852 - 1862
Опубликована: Май 5, 2020
Designing
and
self-assembly
of
unconventional
star-shaped
mesogens
or
'hekates'
are
interest
to
materials
science
molecular
electronics.
This
work
presents
the
synthesis
several
symmetric
trimeric
liquid
crystalline
compounds
comprising
1,3,5-trihydroxybenzene
(phloroglucinol)
as
central
core.
The
behaviour
was
induced
by
attaching
three
rod-like
azo-aromatic
semi-flexible
units
core
via
esteric
linkages.
Based
on
differential
scanning
calorimetry
polarising
optical
microscopy,
mesophase
stability
mainly
depends
alkyl
chain
length.
showed
monotropic
enantiotropic
behaviour,
except
compound
with
nine
atoms
end
which
is
non-mesomorphic.
In
addition
characterisation,
self-assembled
structures
individual
properties
have
been
characterised
simulations.
Liquid Crystals,
Год журнала:
2020,
Номер
48(6), С. 850 - 861
Опубликована: Окт. 13, 2020
In
this
paper,
novel
chiral
calamitic
compounds,
consisting
of
n-dodecyloxyphenyl
substituted
pyridine
carboxylate
core
linked
to
one
or
two
benzene
rings
through
ester
linkers
have
been
synthesised
by
multi-step
procedures.
The
other
end
has
varied
introducing
a
flexible
(S)-2-methylbutyloxy
(S)-3,7-dimethyloctyloxy
chain.
liquid
crystal
properties
new
compounds
were
investigated
various
experimental
techniques
such
as
DSC,
POM
and
SAXS.
pyridine-based
exhibited
enantiotropic
smectic
mesophases
SmC*,
SmA
uncharacteristic
mesophase
depending
on
hetero
aromatic
nicotinate
picolinate
cores,
number
the
type
chiral-branched
Crystals,
Год журнала:
2022,
Номер
12(5), С. 715 - 715
Опубликована: Май 17, 2022
The
synthesis
and
characterization
of
novel
ionic
liquid
crystals
based
on
pyridinium
salts
with
Br−
PF6−
counterions
are
described
in
this
work.
These
were
derived
from
4-hydroxypyridine,
both
by
N-
O-alkylation.
3,4,5-tri(alkyloxy)-benzyl
mesogenic
unit
was
attached
to
the
nitrogen
atom
ring.
Alkyl
chains
a
different
number
carbon
atoms
(6,
8,
10,
12
14)
employed
order
show
effect
stability
mesophase.
POM
(polarizing
optical
microscopy)
XRD
(powder
X-ray
diffraction)
studies
indicated
that
bromide
shorter
C6,
C8
C10
do
not
mesomorphic
properties,
while
longer
chain
analogues
C12
C14
exhibit
two
enantiotropic
columnar
phases.
Surprisingly,
larger
size
counterion
crystal
properties.
Liquid Crystals,
Год журнала:
2020,
Номер
48(2), С. 201 - 214
Опубликована: Июнь 15, 2020
Series
of
oligomeric
ionic
liquid
crystals
(OILCs)
based
on
various
anions
including
bromide
(Br−),
tetrafluoroborate
(BF4−),
dodecylbenzenesulphonate
(A-SO3−)
and
(+)-10-camphorsulphonate
(D-SO3−)
are
synthesised
by
use
pyridine-containing
monomers,
terminal
bromo-substituted
alkanes
anion
replacement
reagents.
The
effect
the
chemical
structure,
liquid-crystalline
behaviour,
conductivity
is
investigated.
OILCs
show
mesophases
smectic,
hexagonal
columnar
bicontinuous
cubic
phase
due
to
change
in
anions.
These
mesophase
types
determined
two
incompatible
segments
derived
from
mesogens
flexible
alkyl
chains
microstructure.
For
A-SO3−
D-SO3−
anions,
a
curvature
interfaces
between
layers
arises
increased
size
one
segment,
resulting
mesophases.
investigated
way
that
lithium
ion
solution
passing
through
oriented
OILC
films
at
room
temperature.
with
conductivities
measuring
system
increase
little
order
>
BF4−>
Br−.
values
nearly
twofold
compared
those
Br-
which
can
be
attributed
effects
both
migration
channels
microstructures.
Liquid Crystals,
Год журнала:
2019,
Номер
47(5), С. 627 - 635
Опубликована: Сен. 26, 2019
Ying
Liua,
Xiaoshan
Zhena,
Sheng
Gaoa,
Qingbin
Xuea
&
Zaijun
Lu*aa
Key
Laboratory
for
Special
Functional
Aggregated
Materials
of
Ministry
Education,
School
Chemistry
and
Chemical
Engineering,
Shandong
University,
Jinan,
P.
R.
China
Polymers for Advanced Technologies,
Год журнала:
2022,
Номер
33(5), С. 1628 - 1641
Опубликована: Янв. 27, 2022
Abstract
Series
of
ionic
liquid
crystalline
polymers
(ILCPs)
containing
bipyridinium
groups
were
synthesized
by
self‐assembly
technology,
and
the
chemical
structure,
behavior,
property,
antistatic
property
investigated
various
techniques.
All
exhibit
good
thermotropic
crystal
on
heating
cycle.
The
precursor
bromo‐polyesters
displayed
nematic
phase,
but
ILCPs
(IPPy‐Br,
IPP‐BF
4
IPP‐PF
6
series)
bipyridine
different
counter‐anions
showed
smectic
C
phase.
effects
counter‐ions
behavior
discussed
in
this
study.
properties
these
a
four‐probe
measuring
instrument.
surface
resistivity
was
slight
sensitivity
to
water
absorption
due
special
structure
conductive
channels
ILCPs.
It
found
that
all
exhibited
superior
performance
conductivity
properties.
In
Br
−
,
BF
PF
counter‐ions,
IPPy‐BF
series
with
maximum
influence
anion
ordered
structure.
