Journal of the American Chemical Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 24, 2025
Glycans
are
intrinsically
flexible
molecules
that
can
adopt
many
conformations.
These
often
carry
ionic
functional
groups
influence
glycan's
conformational
preferences,
dynamics,
and
aggregation
tendencies.
Inspired
by
these
mechanisms,
we
have
engineered
a
glycan
sequence
whose
secondary
structure
be
precisely
manipulated
using
groups.
We
strategically
incorporated
substituents
into
adopting
hairpin
conformation.
Complementary
stabilized
the
closed
conformers,
while
repulsions
shifted
populations
toward
open
forms.
External
stimuli,
such
as
pH
variations
or
enzyme
addition,
enabled
us
to
dynamically
control
hairpin's
opening
closing.
Additionally,
changes
in
protonation
states
led
aggregation,
suggesting
opportunities
for
creation
of
responsive
glycan-based
materials.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(34)
Опубликована: Май 21, 2024
Fabrication
of
chiral
hydrogels
from
thermoresponsive
helical
dendronized
phenylacetylene
copolymers
(PPAs)
carrying
three-fold
dendritic
oligoethylene
glycols
(OEGs)
is
reported.
Three
different
temperatures,
i.e.
below
or
above
cloud
point
temperatures
(T
ACS Macro Letters,
Год журнала:
2024,
Номер
13(6), С. 673 - 680
Опубликована: Май 16, 2024
Chiroptical
nanomaterials
with
circularly
polarized
luminescence
(CPL)
performance
have
aroused
increasing
attention.
Herein,
multicolor
CPL-active
Janus
nanofibers
are
prepared
through
a
simple
parallel
electrospinning
method
using
chiral
helical
polyacetylenes
as
the
source
and
achiral
fluorophores
fluorescent
source.
Interestingly,
despite
direct
spatial
isolation
between
component
component,
blue
green
CPL
emissions
can
still
be
obtained
due
to
fluorescence-selective
absorption
behavior
of
polyacetylenes,
satisfactory
dissymmetric
factor
(glum)
2
×
10-2
2.5
10-3,
respectively.
Moreover,
by
taking
advantage
circular
polarization
fluorescence
energy
transfer
process,
red
emission
is
further
achieved
donors
fluorophore
an
acceptor.
The
present
work
offers
facile
approach
prepare
multilevel-structured
chiroptical
materials
promising
application
potentials
in
flexible
photoelectric
device.
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 17, 2024
Abstract
Host‐guest
systems
have
emerged
as
an
efficient
strategy
for
promoting
organic
room
temperature
phosphorescence
(RTP).
Despite
the
advantages
of
doping
guest
molecules
into
a
host
matrix,
complexity
these
and
lack
techniques
to
visualize
host‐guest
interactions
at
molecular
scale
pose
significant
challenges
in
understanding
underlying
mechanisms.
Here,
novel
RTP
system
is
developed
by
incorporating
low
concentrations
(1–10
mol%)
TPP‐4C‐BI
(guest)
crystalline
TPP‐4C‐Cz
(host).
Utilizing
structural
isomerism,
are
regularly
incorporated
crystal
lattice,
resulting
quantum
yields
almost
ten
times
higher
than
pure
compounds.
The
enabled
resolution
packing
single
through
X‐ray
diffraction,
providing
unprecedented
visualization
interactions.
A
“sergeant‐and‐soldier”
effect,
where
minority
dopant
(sergeants)
significantly
influence
arrangement
(soldiers),
enhances
identified.
Further
analyses
revealed
that
due
molecule's
inefficient
pathway,
its
long‐lived
dark
triplets
channeled
via
triplet‐triplet
energy
transfer
(TTET),
allowing
excited
radiatively
decay
more
efficiently.
These
insights
advance
mechanisms
offer
practical
implications
designing
high‐efficiency
phosphorescent
materials.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(35)
Опубликована: Май 31, 2024
In
the
last
decades,
chemists
have
developed
methods
to
synthesize
helical
molecular
architectures
using
a
combination
of
covalent
and
non-covalent
interactions.
Very
recently,
new
class
completely
covalent,
one-handed
ladder
polymers
has
vigorously
emerged.
Such
can
be
rationally
programmably
obtained
through
an
approach
guided
by
principles
chirality-assisted-synthesis
(CAS)
making
use
synergically
two
disciplines
that
so
far
rarely
interacted:
non-planar
chiral
π-conjugated
synthons
polymer
chemistry.
The
precise
programmability
3D
structure
mechanical
chiroptical
properties
will
lead
potential
applications
in
areas
such
as
enantiorecognition,
catalysis,
spintronics
chiral-related
optoelectronics.
This
minireview
examines
emerging
field
polymers,
analyzing
their
synthesis,
applications,
limitations.
Nanoscale,
Год журнала:
2024,
Номер
16(30), С. 14269 - 14274
Опубликована: Янв. 1, 2024
The
precise
control
of
the
chirality
polymer
assemblies
is
a
challenge
faced
by
scientists
and
has
received
significant
attention
in
recent
years.
In
this
study,
we
employed
polymerization-induced
chiral
self-assembly
(PICSA)
method
to
create
side-chain
cyanobiphenyl
(CB)
block
copolymer
(BCP)
assemblies.
flexible
spacers
CB
monomers
were
regulated
exhibit
two
distinct
odd-even
effects
supramolecular
asymmetrical
arrangement
mesogens
inside
BCP
research
results
indicated
that
liquid
crystalline
properties
significantly
influence
magnitude
sign
their
chiroptical
properties.
These
findings
have
implications
for
design
with
designable
functions.
Abstract
Endowing
biomimetic
sequence–controlled
polymers
with
chiral
functionality
to
construct
stimuli‐responsive
materials
offers
a
promising
approach
for
innovative
chiroptical
switch,
but
it
remains
challenging.
Herein,
is
reported
that
the
self‐assembly
of
sequence‐defined
amphiphilic
alternating
azopeptoids
generate
photo‐responsive
and
ultrathin
bilayer
peptoidosomes
vesicular
thickness
≈1.50
nm
diameter
around
≈290
nm.
The
photoisomerization
azobenzene
moiety
facilitates
reversible
structural
transformation
from
isotropic
anisotropic
1D
helical
nanoribbons
(≈80
width)
under
irradiation
UV
visible
lights,
consequently
leading
chirality
expression
transfer
asymmetric
center
achiral
units.
As
model
deformation‐induced
energy
transfer,
non‐invasive
azobenzene‐based
Förster
resonance
system
unprecedentedly
constructed
via
introduction
fluorescent
donor
pyrene
derivatives
sequentially
photo‐regulated
donor/acceptor
ratio,
displaying
gradient
color
variation
blue
yellow
(a
broad
Stokes
shift
≈200
nm)
high‐efficient
efficiency
97.2%.
photo‐controllable
photoluminescence
phenomenon
endows
these
aggregates
proof‐of‐concept
application
on
multi‐colored
information
encryption.
This
work
provides
prospective
strategy
fabricate
potential
light‐controllable
switches.
Macromolecular Rapid Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 6, 2025
Abstract
Helical
polymer‐containing
bottlebrush
polymers
(BBPs)
are
a
special
and
fascinating
type
of
polymer.
They
possess
topology
contain
helical
as
main
chains
(MCs)
or
side
(SCs),
thereby
presenting
interesting
fantastic
properties,
such
chiral
amplification,
circularly
polarized
luminescence,
photonic
crystal,
so
on.
This
review
mainly
focuses
on
BBPs
containing
polypeptides,
polyacetylenes
(PAs),
polyisocyanides
(PIs).
Detailed
summarizations
severally
given
to
with
polypeptides
MCs
SCs.
Meanwhile,
comprising
PAs
fully
discussed.
What's
more,
consisted
PIs
SCs
described
separately.
In
addition,
other
briefly
introduced,
too.
The
authors
hope
this
will
motivate
more
interest
in
developing
complex
topologies
encourage
further
progress
functional
materials.