The Journal of Physical Chemistry Letters,
Journal Year:
2024,
Volume and Issue:
15(51), P. 12561 - 12570
Published: Dec. 16, 2024
Intramolecular
singlet
fission
(SF)
in
multichromophore
systems
is
of
high
interest
for
photovoltaic
application.
As
an
attractive
candidate
SF-based
devices,
enabling
efficient
SF
covalent
oligomers
perylene
diimide
(PDI)
still
remains
challenging.
In
this
work,
inter-PDI
with
τSF
=
∼150
ps
and
∼150%
triplet
yield
a
tetramer
COTh-FPDI
was
facilitated
by
employing
saddle-shaped
cyclooctatetrathiophene
(COTh)
core
fused
linking
PDIs.
comparison,
ultrafast
symmetry-breaking
charge
separation
(τCS
∼100
fs)
observed
the
COTh-αPDI
flexible
linking.
Taking
advantage
rigid
minimized
excited-state
structural
relaxation,
unique
geometry
can
be
fully
defined
topological
characteristic
COTh,
which
plays
key
role
electronic
coupling
required
SF.
Our
work
provides
new
strategy
intramolecular
predefining
interchromophore
structure,
might
inspired
future
designing
systems.
The Journal of Physical Chemistry C,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 21, 2024
Achieving
wide-range
tunable
emission
colors
in
the
crystalline
state
of
single
fluorophores
is
a
challenging
task.
Here,
we
report
vibronic
coupling
hitherto
unexplored
class
nonaromatic
tetrabrominated
dibenzocyclooctatetraene
two
distinct
polymorphic
forms.
The
thermodynamically
stable
polymorph
(P1)
revealed
single-emission
maximum
upon
excitation
at
different
wavelengths
adhering
to
Kasha's
rule
and
lacks
luminescence
from
triplet
states.
In
contrast,
kinetically
form
(P2)
exhibited
wavelength–dependent
with
range
Δλemimax=
100
nm
room
temperature
phosphorescence.
Prominent
nonadiabatic
couplings
between
bright
several
lower
singlet
states
dimeric
elucidate
emission.
variable
fluorescence
behavior
highlights
possibility
cyclooctatetraene
derivatives
as
novel
multicolor
luminescent
materials
for
future
optoelectronic
applications.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 1, 2024
Abstract
Supramolecular
polymers
are
able
to
change
their
structure,
morphology
and
function
in
response
external
stimuli.
However,
controlling
the
independence
of
stimuli‐responses
these
systems
is
challenging.
Herein,
we
exploit
halogen
bonding
(XB)
as
a
reversible
network
element
regulate
photoresponsive
adaptive
behavior
supramolecular
polymers.
To
this
end,
have
designed
two‐component
system
comprising
an
amphiphilic
XB
acceptor
with
ability
self‐assemble
aqueous
media
(
OPE‐Py
)
molecule
dual
donor
[
E
)‐Azo‐I
].
self‐assembles
into
polymers,
which
transform
nanoparticle
assemblies
upon
co‐assembly
.
Interestingly,
third
type
assembly
(2D
sheets)
obtained
if
treated
exposed
photoirradiation.
At
ambient
conditions,
both
nanoparticles
2D
sheets
remain
invariant
over
time.
heating
dissociates
interactions
present
assemblies,
resulting
transformation
original
fiber‐like
Thus,
breaking
communication
between
self‐assembly
restores
state
system,
drawing
parallels
feedback
loops
programming
language.
This
work
broadens
still
limited
scope
solution
paves
way
for
multifunctional
systems.
Chemistry - A European Journal,
Journal Year:
2024,
Volume and Issue:
31(8)
Published: Dec. 9, 2024
Abstract
Organic
conjugated
molecules
have
gained
widespread
application
as
organic
semiconductors
due
to
their
unique
optoelectronic
properties.
The
rigidity
of
these
large
structures
facilitates
strong
intermolecular
interactions,
which
significantly
influence
properties
in
the
solid
state
through
various
molecular
arrangements.
study
relationship
among
arrangement,
exciton
behavior,
and
is
an
eternal
research
topic.
Cross‐dipole
stacking
a
specific
arrangement
that
demonstrates
characteristics
has
received
continuous
attention
over
past
decades.
This
mini‐review
will
first
discuss
behaviors
cross‐dipole
based
on
models,
including
weak
coupling
suppression
Förster
resonance
energy
transfer.
These
behaviors,
determined
by
arrangements,
are
fundamental
systems.
Next,
we
introduce
well‐defined
systems
summarize
design
principles
from
structure
perspective.
Finally,
present
outstanding
performance,
such
high
solid‐state
luminescence,
good
charge
carrier
mobility,
significant
CD/CPL.
Through
this
mini‐review,
hope
enhance
understanding
stacking,
contributing
construction
systems,
exploration
excited‐state
discovery
high‐performance
materials.
The Journal of Physical Chemistry Letters,
Journal Year:
2024,
Volume and Issue:
15(51), P. 12561 - 12570
Published: Dec. 16, 2024
Intramolecular
singlet
fission
(SF)
in
multichromophore
systems
is
of
high
interest
for
photovoltaic
application.
As
an
attractive
candidate
SF-based
devices,
enabling
efficient
SF
covalent
oligomers
perylene
diimide
(PDI)
still
remains
challenging.
In
this
work,
inter-PDI
with
τSF
=
∼150
ps
and
∼150%
triplet
yield
a
tetramer
COTh-FPDI
was
facilitated
by
employing
saddle-shaped
cyclooctatetrathiophene
(COTh)
core
fused
linking
PDIs.
comparison,
ultrafast
symmetry-breaking
charge
separation
(τCS
∼100
fs)
observed
the
COTh-αPDI
flexible
linking.
Taking
advantage
rigid
minimized
excited-state
structural
relaxation,
unique
geometry
can
be
fully
defined
topological
characteristic
COTh,
which
plays
key
role
electronic
coupling
required
SF.
Our
work
provides
new
strategy
intramolecular
predefining
interchromophore
structure,
might
inspired
future
designing
systems.
