Construction of Z-scheme photocatalyst with p-n heterojunction of molecular semiconductors for enhanced photocatalytic water oxidation
Applied Catalysis B Environment and Energy,
Год журнала:
2023,
Номер
342, С. 123381 - 123381
Опубликована: Окт. 10, 2023
Язык: Английский
Ultrafast symmetry-breaking charge separation in Perylenemonoimide-embedded multichromophores: impact of regioisomerism
Chemical Science,
Год журнала:
2024,
Номер
15(17), С. 6363 - 6377
Опубликована: Янв. 1, 2024
Symmetry-breaking
charge
separation
(SB-CS)
has
recently
evolved
as
an
emerging
concept
offering
its
potential
to
the
latest
generation
of
organic
photovoltaics.
Язык: Английский
Tuning Excited-State Charge Transfer Character in Cofacial Core-Substituted Perylenediimide Dimers
The Journal of Physical Chemistry B,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 25, 2025
Understanding
the
interplay
between
excimer
formation
and
symmetry-breaking
charge
separation
is
important
for
optimizing
in
organic
photovoltaic
materials.
To
explore
this
connection,
we
synthesized
four
1,6,7,12-tetrakis(p-X-phenoxy)perylene-(3,4:9,10)-bisdicarboximide
cofacially
stacked
dimers,
where
X
=
MeO,
tert-butyl,
Br,
CF3.
Steady-state
spectroscopy
reveals
H-type
aggregation
all
while
transient
absorption
shows
relatively
small
changes
their
excited-state
absorptions.
However,
time-resolved
fluorescence
(TRF)
that
relaxation
occurs
from
an
initial
Frenkel
exciton-dominated
state
to
one
which
transfer
(CT)
character
contributes.
Relaxation
lower-lying
with
CT
attributed
a
combination
of
structural
distribution
elicited
by
varying
substituents.
This
study
illustrates
how
subtle
structure
can
combine
influence
excited
dynamics
molecular
dimers.
Язык: Английский
Close π-π Stacking Facilitated Intermolecular Charge Separation in Self-Assembled Perylene Monoimide for Photocatalytic Hydrogen Production
Chinese Journal of Structural Chemistry,
Год журнала:
2025,
Номер
unknown, С. 100592 - 100592
Опубликована: Март 1, 2025
Язык: Английский
Electron–Vibration Couplings Open New Channels for Energy Redistribution of Self-Assembled Monolayers on Plasmonic Nanoparticles
Quanbing Pei,
Xiaoxuan Zheng,
Junjun Tan
и другие.
The Journal of Physical Chemistry Letters,
Год журнала:
2025,
Номер
unknown, С. 3571 - 3578
Опубликована: Апрель 2, 2025
Unveiling
how
the
interaction
between
self-assembled
monolayers
and
plasmonic
nanoparticles
(PNPs)
impacts
molecular
vibrational
energy
redistribution
(VER)
is
crucial
for
optimizing
plasmon-mediated
chemical
reactions
(PMCRs).
However,
direct
experimental
evidence
molecule-PNP
interactions
opening
new
channels,
such
as
up-pumping
transfer
self-trapping
of
excitation,
VER
has
yet
to
be
validated.
Here,
we
demonstrate
that
electron-vibration
coupling
(EVC)
induced
by
can
open
these
pathways
utilizing
femtosecond
time-resolved
sum-frequency
generation
spectroscopy.
Using
4-nitrothiophenol
(4-NTP)
on
PNPs
a
model,
observed
EVC
opens
"forbidden"
channel
from
4-NTP
nitro
symmetric
stretching
(νNO2)
phenyl
ring
C═C
(νC═C)
modes.
The
self-trapped
state
excited
νC═C
modes
found,
which
originates
EVC-driven
intermolecular
coupling.
These
findings
contribute
better
understanding
PMCR
mechanisms
help
guide
design
catalysts
with
excellent
performance.
Язык: Английский
Lattice Symmetry‐Guided Charge Transport in 2D Supramolecular Polymers Promotes Triplet Formation
Advanced Science,
Год журнала:
2024,
Номер
11(30)
Опубликована: Июнь 12, 2024
Abstract
Singlet‐to‐triplet
intersystem
crossing
(ISC)
in
organic
molecules
is
intimately
connected
with
their
geometries:
by
modifying
the
molecular
shape,
symmetry
selection
rules
pertaining
to
spin‐orbit
coupling
can
be
partially
relieved,
leading
extra
matrix
elements
for
increased
ISC.
As
an
analog
this
design
concept,
study
finds
that
lattice
of
supramolecular
polymers
also
defines
triplet
formation
efficiencies.
A
polymer
self‐assembled
from
weakly
interacting
considered.
Its
2D
oblique
unit
cell
effectively
renders
it
as
a
coplanar
array
1D
columns
bound
each
other.
Using
momentum‐resolved
photoluminescence
imaging
combination
Monte
Carlo
simulations,
found
photogenerated
charge
carriers
predominantly
recombine
spin‐uncorrelated
carrier
pairs
through
inter‐column
transfer
states.
This
lattice‐defined
recombination
pathway
leads
substantial
efficiency
(≈60%)
polymer.
These
findings
suggest
micro‐/macroscopic
structures
relying
on
intermolecular
interactions
strategized
controlled
formation.
Язык: Английский
Pore Nanoarchitectonics of Carbon Nitrides for the Excited‐State Deactivation of Confined Methylene Blue
ChemistryEurope,
Год журнала:
2023,
Номер
1(3)
Опубликована: Окт. 18, 2023
Abstract
The
confinement
of
organic
chromophores
within
mesoporous
material
architectures
can
exert
a
considerable
alteration
on
their
physico‐chemical
properties.
This
study
presents
detailed
spectroscopic
investigation
methylene
blue
(MB)
entrapped
in
polymeric
carbon
nitrides
(mPCNs)
with
different
pore
architecturesusing
transient
absorption
spectroscopy
(TAS).
spatial
MB
molecules
results
prominent
change
spectra,
characterized
by
both
redshifts
and
the
appearance
additional
shoulder
peaks,
arising
from
formation
dimers
(MB
2
)
concomitant
distortion
structure.
Upon
photoexcitation,
exhibit
notable
altered
excited‐state
feature,
along
drastic
quenching
ns
compared
to
molecues
bulk
solutions.
In
contrast
ultrafast
sole
lifetime
~3.6
ps
highly
concentrated
solutions,
concentration‐dependent
behavior
aggregates
confined
environments
suggests
effect
is
caused
excimers
formed
close
proximity.
findings
this
work
highlight
impact
constrained
intermolecular
interactions
relaxation
pathways
excited
states
photoactive
molecules.
Язык: Английский
Substitution effects on the photoinduced excited state dynamics of perylenemonoimides in solution and thin films
Physical Chemistry Chemical Physics,
Год журнала:
2024,
Номер
26(21), С. 15600 - 15610
Опубликована: Янв. 1, 2024
APITB
is
designed
as
a
donor–acceptor
dyad,
with
thianthrene
donor
and
PMI
an
acceptor.
The
activation
of
the
triplet
state
through
spin–orbit
charge
transfer
intersystem
crossing
(SOCT-ISC)
process
in
THF
was
observed
moiety.
Язык: Английский
Promotion of Fast and Efficient Singlet Fission Process of PDI Dimers by Selenium Substitution
The Journal of Physical Chemistry B,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 15, 2024
Singlet
fission
(SF)
is
a
triplet
generation
mechanism
capable
of
turning
singlet
exciton
into
two
excitons.
It
has
the
potential
to
enhance
power
conversion
efficiency
single-junction
solar
cells.
Perylene
diimides
(PDIs)
are
class
dye
molecules
with
photovoltaic
properties
and
beginning
receive
more
attention
due
their
for
SF.
Here,
we
report
selenium-substituted
PDI
dimer,
Se-PDI-II,
studied
its
SF
by
using
steady-state,
transient
absorption,
time-resolved
photoluminescence
spectroscopy.
Compared
unsubstituted
dimer
PDI-II,
found
that
introduction
selenium
atoms
can
suppress
excimer
emission
during
process,
showing
much
higher
yield.
Язык: Английский