Journal of Physics Condensed Matter,
Journal Year:
2024,
Volume and Issue:
36(39), P. 395803 - 395803
Published: June 27, 2024
The
magnetic
properties
of
a
circular
graphene
nanoribbon
(carbon
belt)
in
field
parallel
to
its
central
axis
is
studied
using
tight-binding
model.
Orbital
susceptibility
calculated
an
analytical
expression
the
energy
eigenvalues
as
function
flux
density
for
any
size,
and
temperature
dependence
considered.
In
absence
electron
hopping
field,
orbital
diverges
at
absolute
zero
if
chemical
potential
number
atoms
multiple
four.
As
increases,
magnitude
decreases
according
power
law,
whose
exponent
depends
on
size.
presence
divergence
near
disappears,
sign
changes
with
transfer
integral
temperature.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(23), P. 16161 - 16172
Published: May 9, 2024
Introducing
helical
subunits
into
negatively
curved
π-systems
has
a
significant
effect
on
both
the
molecular
geometry
and
photophysical
properties;
however,
synthesis
of
these
embedded
with
nonbenzenoid
remains
challenging
due
to
high
strain
deriving
from
curvature
helix.
Here,
we
report
family
nonalternant
nanographenes
containing
nitrogen
(N)-doped
cyclopenta[ef]heptalene
unit.
Among
them,
CPH-2
CPH-3
can
be
viewed
as
hybrids
benzoannulated
aza[7]helicene.
The
crystal
structures
revealed
saddle
for
CPH-1,
saddle-helix
hybrid
CPH-2,
twist-helix
CPH-3.
Experimental
measurements
theoretical
calculations
indicate
that
moieties
in
CPHs
undergo
flexible
conformational
changes
at
room
temperature,
while
aza[7]helicene
subunit
exhibits
dramatically
increased
racemization
energy
barrier
(78.2
kcal
mol–1
143.2
CPH-3).
combination
lone
electron
pairs
N-doped
unit
twisted
helix
fragments
results
rich
photophysics
distinctive
fluorescence
phosphorescence
CPH-1
similar
Both
enantiopure
display
distinct
circular
dichroism
(CD)
signals
UV–vis
range.
Notably,
compared
reported
fully
π-extended
nanographenes,
excellent
chiroptical
properties
|gabs|
value
1.0
×
10–2
|glum|
7.0
10–3;
values
are
among
highest
nanographenes.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(15)
Published: Feb. 12, 2024
Abstract
A
negatively
curved
aza‐nanographene
(NG)
containing
two
octagons
was
synthesized
by
a
regioselective
and
stepwise
cyclodehydrogenation
procedure,
in
which
double
aza[7]helicene
simultaneously
formed
as
an
intermediate.
Their
saddle‐shaped
structures
with
negative
curvature
were
unambiguously
confirmed
X‐ray
crystallography,
thereby
enabling
the
exploration
of
structure–property
relationship
photophysical,
electrochemical
conformational
studies.
Moreover,
assembly
octagon‐embedded
aza‐NG
fullerenes
probed
fluorescence
spectral
titration,
record‐high
binding
constants
(
K
=9.5×10
3
M
−1
C
60
,
=3.7×10
4
70
)
found
among
reported
polycyclic
aromatic
compounds.
The
tight
association
further
elucidated
diffraction
analysis
their
co‐crystal,
showed
formation
1
:
complex
substantial
concave‐convex
interactions.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(20)
Published: Feb. 22, 2024
Abstract
Mechanically
interlocked
molecules
(MIMs)
represent
an
exciting
yet
underexplored
area
of
research
in
the
context
carbon
nanoscience.
Recently,
work
from
our
group
and
others
has
shown
that
small
nanotube
fragments—[n]cycloparaphenylenes
([n]CPPs)
related
nanohoop
macrocycles—may
be
integrated
into
mechanically
architectures
by
leveraging
supramolecular
interactions,
covalent
tethers,
or
metal‐ion
templates.
Still,
available
synthetic
methods
are
typically
difficult
low
yielding,
general
allow
for
creation
a
wide
variety
these
structures
limited.
Here
we
report
efficient
route
to
via
active
template
Cu‐catalyzed
azide‐alkyne
cycloaddition
(AT−CuAAC)
reaction.
With
appropriate
choice
substituents,
macrocyclic
precursor
2,2′‐bipyridyl
embedded
[9]CPP
(bipy[9]CPP)
participates
AT−CuAAC
reaction
provide
[2]rotaxanes
near‐quantitative
yield,
which
can
then
converted
fully
π‐conjugated
catenane
structures.
Through
this
approach,
two
nanohoop[2]catenanes
synthesized
consist
bipy[9]CPP
catenated
with
either
Tz[10]CPP
Tz[12]CPP
(where
Tz
denotes
1,2,3‐triazole
moiety
replacing
one
phenylene
ring
[n]CPP
backbone).
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(11), P. 7135 - 7139
Published: March 5, 2024
Organic
near-infrared
(NIR)
photoblinking
fluorophores
are
highly
desirable
for
live-cell
super-resolution
imaging
based
on
single-molecule
localization
microscopy
(SMLM).
Herein
we
introduce
a
novel
small
chromophore,
PMIP,
through
the
fusion
of
perylenecarboximide
with
2,2-dimetheylpyrimidine.
PMIP
exhibits
an
emission
maximum
at
732
nm
high
fluorescence
quantum
yield
60%
in
wavelength
range
700–1000
and
excellent
without
any
additives.
With
resorcinol-functionalized
(PMIP-OH),
NIR
SMLM
lysosomes
is
demonstrated
first
time
living
mammalian
cells
under
physiological
conditions.
Moreover,
metabolically
labeled
nascent
DNA
site-specifically
detected
using
azido-functionalized
(PMIP-N3)
via
click
chemistry,
thereby
enabling
phosphate-buffered
saline
9-fold
improvement
spatial
resolution.
These
results
indicate
potential
PMIP-based
blinking
biological
applications
SMLM.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 27, 2024
The
construction
of
multiple
heptagonal
rings
in
nanographene
is
the
key
step
for
obtaining
exotic
carbon
nanostructures
with
a
negative
curvature
and
intriguing
properties.
Herein,
novel
saddle-shaped
(
Interdisciplinary materials,
Journal Year:
2024,
Volume and Issue:
3(4), P. 453 - 479
Published: May 11, 2024
Abstract
In
recent
years,
the
precisely
controlled
synthesis
of
chiral
twisted
molecular
carbons
has
emerged
as
a
forefront
topic
in
research
carbon
materials.
Molecular
refer
to
nanomaterials
synthesized
with
precision
at
atomic
level.
Through
rational
design,
rigid
and
stable
structures
can
be
synthesized.
The
exploration
field
is
key
fully
understanding
various
configurations
materials
delving
into
relationship
between
structure
design
functionality.
This
review
explores
such
nanographene,
nanobelts,
nanosheets,
graphdiyne,
etc.
It
emphasizes
role
photocyclization,
Scholl
reaction,
Diels–Alder
reactions
achieving
precise
control
discusses
range
innovative
strategies.
These
strategies
have
led
development
structures,
helical,
propeller,
Möbius
strip
configurations.
introduction
chirality,
combined
inherent
exceptional
optical
properties
nanocarbon
materials,
facilitated
creation
superior
chiroptical
performances.
advancement
driving
applications
fields
optoelectronics
optics.
Chemical Science,
Journal Year:
2023,
Volume and Issue:
15(6), P. 1953 - 1965
Published: Dec. 26, 2023
Precise
template
synthesis
will
realize
three-dimensionally
ordered
nanoporous
graphenes
(NPGs)
with
a
spatially
controlled
seamless
graphene
structure
and
fewer
edges.
These
structural
features
result
in
superelastic
nature,
high
electrochemical
stability,
electrical
conductivity,
fast
diffusion
of
gases
ions
at
the
same
time.
Such
innovative
3D
materials
are
conducive
to
solving
energy-related
issues
for
better
future.
To
further
improve
attractive
properties
NPGs,
we
review
its
mechanism
by
chemical
vapor
deposition
hydrocarbons,
analysis
structure,
applications
mechanical
devices.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(17), P. 11978 - 11990
Published: April 16, 2024
Tethered
nonplanar
aromatics
(TNAs)
make
up
an
important
class
of
aromatic
compounds
showing
unique
features.
However,
the
knowledge
on
synthesis,
structures,
and
properties
TNAs
remains
insufficient.
In
this
work,
a
new
type
TNAs,
tethered
lactams,
is
synthesized
via
Pd-catalyzed
consecutive
intramolecular
direct
arylations.
These
molecules
possess
helical
ladder-type
conjugated
system
to
13
fused
rings.
The
overall
yields
ranged
from
3.4
4.3%.
largest
6L-Bu-C14,
demonstrates
guest-adaptive
hosting
capability
for
first
time.
When
binding
fullerene
guests,
cavity
6L-Bu-C14
became
more
circular
better
accommodate
spherical
molecules.
host–guest
interaction
thoroughly
studied
by
X-ray
crystallography,
theoretical
calculations,
fluorescence
titration,
nuclear
magnetic
resonance
(NMR)
titration
experiments.
shows
stronger
with
C70
than
C60
due
convex–concave
π–π
interaction.
P
M
enantiomers
all
lactams
show
distinct
persistent
chiroptical
demonstrate
potential
chiral
as
circularly
polarized
luminescence
(CPL)
emitters.