Catalysts,
Journal Year:
2023,
Volume and Issue:
13(6), P. 928 - 928
Published: May 24, 2023
A
systematic
synthetic
study
was
performed
to
explain
the
usual
trend
in
selectivity
towards
multi-coupling,
over
mono-coupling,
Suzuki–Miyaura
reactions.
This
preference
observed
under
different
reaction
conditions:
for
various
halobenzenes,
using
substituents
on
boronic
acid,
and
changing
catalyst
temperature.
Moreover,
this
found
increase
more
reactive
systems
oxidative
addition
diluted
media.
The
results
constitute
experimental
evidence
that
formation
of
totally
substituted
coupling
product
is
kinetically
favoured
by
a
path
location—the
proximity
between
regenerated
newly
formed
intermediate
promotes
subsequent
reaction.
Accounts of Chemical Research,
Journal Year:
2023,
Volume and Issue:
56(21), P. 2954 - 2967
Published: Oct. 18, 2023
Conspectusπ-Conjugated
polymers
have
gained
significant
interest
because
of
their
potential
applications
in
optoelectronics,
bioelectronics,
and
other
domains.
The
controlled
synthesis
π-conjugated
block
optimizes
performance
enables
novel
properties
functions.
However,
precise
control
the
self-assembled
architectures
remains
a
formidable
challenge.
Inspired
by
helical
biomacromolecules,
supramolecular
assemblies
attention.
Helical
with
an
excess
one-handed
helicity
can
be
optically
active
strong
tendency
toward
self-assembly.
Incorporating
polymer
into
induce
asymmetric
assemblies,
leading
to
chiral
materials
unique
functionalities.To
self-assembly
architectures,
are
usually
synthesized
copolymers
incorporating
self-assembling
characteristics.
Although
various
been
produced,
is
still
challenging
has
rarely
addressed.
self-assembly,
which
transfers
chirality
polymer,
resulting
chiroptical
functionalities.
synthesizing
hybrid
containing
two
distinct
blocks
complicated.
Some
general
strategies
such
as
connecting
chain
ends
preformed
homopolymers
extending
prefabricated
second
monomer
time-consuming
require
complex
synthetic
protocols.
Therefore,
developing
for
facile
predictable
molar
mass,
low
dispersity,
tunable
composition
practical
importance.Recently,
we
investigated
polyisocyanides,
polyallenes,
polycarbenes
advanced
Pd(II)
Ni(II)
catalysts.
These
were
successfully
incorporated
polymers,
including
polythiophene,
polyfluorene,
poly(phenyleneethynylene),
via
one-pot
sequential
living
polymerization
monomers
using
Pd(II)-
or
Ni(II)-complexes
As
result,
variety
well-defined
polymeric
readily
synthesized.
copolymerized
possess
different
structures
mechanisms,
copolymerization
followed
mechanism
provided
desired
high
yields
narrow
size
distribution,
composition.Remarkably,
induces
copolymer
supramolecular,
architecture
optical
properties.
More
interestingly,
utilizing
crystallization
conjugated
blocks,
crystallization-driven
helix-induced
yielded
family
uniform
single-handed
dimensions,
helicity.
transfer
rendered
achiral
emission
white
light
over
broad
spectrum
circularly
polarized
luminescence.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
19(1), P. 229 - 280
Published: Jan. 4, 2025
Helical
structures
such
as
right-handed
double
helix
for
DNA
and
left-handed
α-helix
proteins
in
biological
systems
are
inherently
chiral.
Importantly,
chirality
at
the
nanoscopic
level
plays
a
vital
role
their
macroscopic
chiral
functionalities.
In
order
to
mimic
functions
of
natural
nanoarchitectures,
variety
nanostructures
obtained
from
artificial
helical
polymers
prepared,
which
can
be
directly
observed
by
atomic
force
microscopy
(AFM),
scanning
tunneling
(STM),
electron
(SEM),
transmission
(TEM).
This
review
mainly
focuses
on
formation
morphology
regulation
triggered
polymer
chain
length,
concentration,
solvent,
temperature,
photoirradiation,
chemical
additives.
addition,
distinct
including
recognition,
circularly
polarized
luminescence,
drug
release,
cell
imaging,
antibiosis
also
discussed.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(20), P. 26604 - 26612
Published: May 9, 2024
One
of
the
most
important
factors
for
future
application
circularly
polarized
luminescence
(CPL)
materials
is
their
high
dissymmetry
(gem),
and
more
studies
are
working
tirelessly
to
focus
on
increasing
gem
value.
Herein,
we
chose
an
achiral
liquid
crystal
polymer
(LC-P)
two
chiral
binaphthyl-based
inducers
(R/S-3
R/S-6)
with
different
substitution
positions
(3,3'
R/S-3
6,6'
construct
co-assemblies
explored
induced
amplification
CPL
behaviors.
Interestingly,
after
thermal
annealing
treatment,
this
kind
co-assembly
(R/S-3)0.05-(LC-P)0.95
can
emit
a
superior
signal
(|gem|
=
0.31
λem
424
nm),
which
achieves
about
13-fold
in
spin-coated
film,
compared
(R/S-6)0.1-(LC-P)0.9
0.023
nm).
This
because
could
further
co-assemble
form
ordered
arrangement
LC
state
generate
regular
helix
nanofibers
than
that
(R/S-6)0.1-(LC-P)0.9.
work
provides
efficient
method
synthesizing
high-quality
CPL-active
through
strategic
manipulation
structure
co-assembled
LCP
systems.
Chiral
induction
of
polyfluorene
(PF)-containing
block
copolymers
plays
a
crucial
role
in
the
development
advanced
functional
materials;
however,
research
this
area
remains
scarce.
In
contribution,
PFO-b-PPI
diblock
comprising
blocks
poly(9,9-dioctylfluorene)
(PFO)
and
poly(phenyl
isocyanide)
(PPI)
were
readily
synthesized
one
pot
by
combining
chain-growth
Suzuki
cross-coupling
polymerization
modified
9,9-dioctylfluorene
monomer
with
Pd(II)-catalyzed
phenyl
isocyanide
bearing
pentafluorophenyl
ester
substitute.
The
obtained
possessed
controlled
molar
mass
(Mn)
narrow
dispersity
(Mw/Mn,
Đ).
Meanwhile,
optically
active
supramolecular
assemblies
could
be
formed
via
coassembly
chiral
binaphthyl-based
inducer
film
state
after
thermal
annealing
treatment,
chirality
was
influenced
temperature
weight
ratio
copolymer
to
inducer,
thickness
film.
Further
investigations
revealed
that
exhibited
morphology
single-handed
helical
nanofibers,
sense
nanofibers
depended
on
configuration
inducer.
Moreover,
excellent
circularly
polarized
luminescence
(CPL)
performance
glum
as
high
0.11.
Macromolecular Rapid Communications,
Journal Year:
2023,
Volume and Issue:
44(15)
Published: May 10, 2023
In
this
work,
π-conjugated
block
copolymers
consisting
of
poly(phenyl
isocyanide)
(PPI)
and
polyfluorene
(PF)
segments
are
facilely
prepared
by
one-pot
sequential
polymerization
phenyl
isocyanide
(monomer
1)
7-bromo-9,9-dioctylfluorene-2-boronic
acid
pinacol
ester
2).
The
Pd(II)-terminated
PPI
is
first
via
polymerizing
monomer
1
catalyzed
with
alkyne-Pd(II)
complex
then
utilized
to
initiate
the
controlled
Suzuki
cross-coupling
2,
yielding
various
PPI-b-PF
possessing
molar
mass
narrow
dispersity.
Owing
helical
conformation
segment
structure
PF
segment,
present
distinctive
optical
property
fascinating
chiral
self-assembly
behavior.
During
process,
chirality
transfer
from
supramolecular
aggregates
nanofibers
occurs
afford
optically
active
high
activity.
Furthermore,
self-assembled
exhibit
excellent
circularly
polarized
luminescence
performance.
Macromolecules,
Journal Year:
2024,
Volume and Issue:
57(9), P. 4567 - 4575
Published: May 2, 2024
The
design
of
excellent
circularly
polarized
luminescence
(CPL)
materials
with
a
large
dissymmetry
factor
(glum)
remains
great
challenge.
In
this
paper,
we
chose
two
achiral
conjugated
pyrene-based
main-chain
polymers
(BP-1
and
BP-2)
different
substitution
positions
(1,6-positions
the
pyrene
rings
for
BP-1
2,7-positions
chiral
binaphthyl-based
inducer
(S/R-D)
bridged
alkyl
chain
to
construct
coassemblies
through
an
intermolecular
chirality
induction
mechanism.
Interestingly,
after
thermal
annealing
treatment,
resulting
S/R-D-BP-2
could
emit
inverted
amplified
CPL
signals
compared
S/R-D-BP-1.
Most
significantly,
maximum
|glum|
value
(S/R-D)0.2-(BP-2)0.8
in
spin-coated
film
was
up
0.71
(λem
=
428
nm,
QY
44.8%)
at
220
nm
thickness,
which
about
6-fold
that
(S/R-D)0.1-(BP-1)0.9
(|glum|
0.12,
λem
451
37.6%).
glum
due
formation
regular
ordered
helical
nanofibers
strong
π–π
stacking
interactions.
This
work
provides
creative
approach
tune
emission
amplification
behaviors
by
coassembly
from
polymers.
