Mechanical Twisting-Induced Enhancement of Second-Order Optical Nonlinearity in a Flexible Molecular Crystal
Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 7, 2025
Flexible
molecular
crystals
are
essential
for
advancing
smart
materials,
providing
unique
functionality
and
adaptability
applications
in
next-generation
electronics,
pharmaceuticals,
energy
storage.
However,
the
optical
of
flexible
have
been
largely
restricted
to
linear
optics,
with
nonlinear
(NLO)
properties
rarely
explored.
Herein,
we
report
on
application
mechanical
twisting
second-order
optics.
The
crystal
formed
through
self-assembly
model
compound
9-anthraldehyde
(AA)
features
an
intrinsic
chiral
noncentrosymmetric
structure,
demonstrating
high
efficiency
second
harmonic
generation
(SHG)
NLO
circular
dichroism,
which
could
be
greatly
enhanced
by
macroscopic
twisting.
anisotropic
stacking
imparts
AA
flexibility
combined
elastic
bending
plastic
isochiral
enhance
SHG
intensities
order
magnitude
depending
their
M-
or
P-configuration.
Meanwhile,
dichroism
factor
gSHG-CD
twisted
is
increased,
achieving
highest
reported
anisotropy
among
organic
materials.
These
boosted
performances
intensity
chiroptical
response
expected
expand
photonic
crystals.
Язык: Английский
Effect of Mechanical Properties and Photoluminescence in Elastic Crystals Triggered by Substituent Regioisomerism
Crystal Growth & Design,
Год журнала:
2025,
Номер
25(5), С. 1448 - 1456
Опубликована: Фев. 13, 2025
Deformable
organic
photoluminescent
crystals
are
a
kind
of
fundamental
material
to
exploit
cutting-edge
flexible
optoelectronic
devices.
However,
the
realization
that
modulation
mechanical
and
properties
is
difficult
due
structural
properties,
relationships
for
bendable
molecular
remain
unclear,
especially
between
packing,
photoluminescence
(PL).
Herein,
we
report
different
supramolecular
structures
intermolecular
π···π
stacking
via
substituent
regioisomerism
effect
(SRIE),
based
on
three
crystalline
dicarbazol-9-yl-based
pyrazine
regioisomers
para-,
meta-,
ortho-convergent
substitutions
(p-DCzP,
m-DCzP,
o-DCzP,
respectively).
We
discover
elasticity
p-DCzP
m-DCzP
benefit
from
one-dimensional
chains
carbazole
(Cz)
units,
while
brittleness
o-DCzP
results
multidirectional
Cz
units.
Molecular
dynamics
(MD)
simulations
suggest
energy
beneficial
reducing
noncovalent
interaction
stabilizing
aggregation
structures.
In
addition,
such
in
elastic
can
vanish
aggregation-caused
quenching
maintain
higher
quantum
yields
blue
emission
dilute
solutions
crystals.
This
research
reveals
SRIE
believe
this
work
will
provide
new
perspectives
development
functional
crystal
materials.
Язык: Английский
Organic Self‐Healing Single Crystals
Chemistry - An Asian Journal,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 18, 2025
Abstract
Self‐healing
single
crystals,
which
possess
the
ability
to
recover
from
damage,
represent
an
emerging
filed
within
dynamic
single‐crystal
materials.
These
materials
not
only
deepen
our
understanding
of
flexible
structures
inherent
in
crystals
but
also
offer
a
novel
pathway
for
development
smart
materials,
including
soft
robots,
microelectronic
devices,
and
optical
devices.
In
this
perspective,
we
provide
comprehensive
summary
recent
advancements
organic
self‐healing
highlighting
various
mechanisms,
typical
molecular
structures,
testing
methods
utilized
investigate
these
We
hope
that
systematic
overview
field
will
significantly
contribute
advancement
crystal
as
new
class
molecular‐based
functional
particularly
integration
properties
with
innovative
optoelectronic
functionalities.
Язык: Английский
Self-Regulating Photoactuation of Molecular Crystals Based on Halogenstyrylquinoxalines
Crystal Growth & Design,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 26, 2025
Язык: Английский
Regulating Reversible Untwisting and Twisting Motions in Helical Dynamic Molecular Crystals
Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 17, 2025
Dynamic
molecular
crystals
with
a
desirable
morphology
and
controllable
responses
to
external
stimuli
are
highly
desired
but
remain
challenging.
Here,
we
present
new
photoactive
crystal
(MCA)
featuring
naphthalene
backbone
linked
vinyl
structure
an
asymmetric
tail.
It
can
undergo
reversible
head-to-tail
[2
+
2]
photodimerization
under
visible
light
illumination
heating.
Helicoidally
twisted
crystalline
fibers
be
easily
prepared
by
drop-casting
MCA
ethanol
solution
onto
glass
surface.
The
thread
length
fiber
width
regulated
changing
the
solvent
evaporation
temperature.
An
untwists
upon
irradiation
twists
back
mild
heating
due
dissociation
of
metastable
photodimer
(d-MCA),
enabling
reverse
transformation.
Crystallinity
overall
helical
reserved
well
during
untwisting
twisting
cycles,
allowing
multiple
repetitions
dynamic
motions.
Under
interval
excitation
continuous
heating,
perform
cyclical
untwisting-twisting
motions
over
200
times
for
5
h.
amount
significantly
affects
photoresponse,
resulting
in
fully
partial
twisting,
or
complete
at
different
dimer
fractions.
We
found
that
about
10%
d-MCA
is
enough
drive
circular
movements.
Higher
photoproduct
conversion
makes
prone
fatigue
lose
cyclic
responses.
Our
results
provide
excellent
example
fabricating
organic
soft
robotics
photoactuators
based
on
spiral
Язык: Английский