Roadmap for Designing Donor-π-Acceptor Fluorophores in UV-Vis and NIR Regions: Synthesis, Optical Properties and Applications
Biomolecules,
Год журнала:
2025,
Номер
15(1), С. 119 - 119
Опубликована: Янв. 14, 2025
Donor
acceptor
(D-π-A)
fluorophores
containing
a
donor
unit
and
an
moiety
at
each
end
connected
by
conjugated
linker
gained
attention
in
the
last
decade
due
to
their
system
ease
of
tunability.
These
features
make
them
good
candidates
for
various
applications
such
as
bioimaging,
photovoltaic
devices
nonlinear
optical
materials.
Upon
excitation
D-π-A
fluorophore,
intramolecular
charge
transfer
(ICT)
occurs,
it
polarizes
molecule
resulting
‘push–pull’
system.
The
emission
wavelengths
can
be
altered
from
UV-vis
NIR
region
modifying
unit,
π
between
them.
emitting
with
restricted
molecular
rotations
are
used
aggregation-induced
(AIE).
carboxylic
acid
cyano
groups
preferred
applications,
large
surface
area
two
photon
absorbing
applications.
Herein,
we
report
synthesis,
properties,
region.
Язык: Английский
Effects of the nature of donor substituents on the photophysical and electroluminescence properties of derivatives of perfluorobiphenyl: donor–acceptor versus donor–acceptor–donor type AIEE/TADF emitters
Journal of Materials Chemistry C,
Год журнала:
2024,
Номер
12(8), С. 2911 - 2925
Опубликована: Янв. 1, 2024
The
synthesis
and
properties
of
a
group
organic
electroactive
compounds
based
on
electron-deficient
perfluorobiphenyl
(PFBP)
are
described.
Язык: Английский
Aloe Extracellular Vesicles as Carriers of Photoinducible Metabolites Exhibiting Cellular Phototoxicity
Cells,
Год журнала:
2024,
Номер
13(22), С. 1845 - 1845
Опубликована: Ноя. 7, 2024
The
growing
interest
in
plant-origin
active
molecules
with
medicinal
properties
has
led
to
a
revaluation
of
plants
the
pharmaceutical
field.
Plant-derived
extracellular
vesicles
(PDEVs)
have
emerged
as
promising
candidates
for
next-generation
drug
delivery
systems
due
their
ability
concentrate
and
deliver
plethora
bioactive
molecules.
These
bilayer
membranous
vesicles,
whose
diameter
ranges
from
30
1000
nm,
are
released
by
different
cell
types
play
crucial
role
cross-kingdom
communication
between
humans.
Notably,
PDEVs
demonstrated
efficacy
treating
various
diseases,
including
cancer,
alcoholic
liver
disease,
inflammatory
bowel
disease.
However,
further
research
on
plant
is
necessary
fully
understand
traits
purposes.
This
study
investigates
phototoxic
effects
(EVs)
Язык: Английский
Uncovering the substituted-position effect on excited-state evolution of benzophenone-phenothiazine dyads
The Journal of Chemical Physics,
Год журнала:
2023,
Номер
159(14)
Опубликована: Окт. 11, 2023
Photofunctional
materials
based
on
donor-acceptor
molecules
have
drawn
intense
attention
due
to
their
unique
optical
properties.
Importantly,
Systematic
investigation
of
substitution
effects
excited-state
charge
transfer
dynamics
is
a
powerful
approach
for
identifying
application-relevant
design
principles.
Here,
by
coupling
phenothiazine
(PTZ)
at
the
ortho-,
meta-,
and
para-positions
benzene
ring
benzophenone
(BP),
three
regioisomeric
BP-PTZ
dyads
were
designed
understand
relationship
between
substituted
positions
evolution
channels.
Ultrafast
transient
absorption
used
detect
trace
species
related
channels
excited
state.
In
non-polar
solvent,
BP-o-PTZ
undergoes
through-space
process
produce
singlet
charge-transfer
(1CT)
state,
which
subsequently
proceeds
intersystem
crossing
transforms
into
triplet
(3CT)
state;
BP-m-PTZ
experiences
intramolecular
(ICT)
generate
1CT
3CT
state
(ISC)
finally
converts
local-excited
(3LE)
as
BP-p-PTZ,
only
3LE
states
can
be
detected
after
ISC
from
On
other
hand,
twisted
ICT
are
generated
via
motion
donor
acceptor
all
or
planarization
PTZ
unit
in
high
polar
solvents.
The
theoretical
calculations
unveil
that
features
interaction
play
decisive
role
determining
through-bond
processes.
Also,
these
results
demonstrate
derivatives
could
modified
tuning
dyads.
This
study
provides
deep
perspective
substitute-position
effect
donor-acceptor-type
derivatives.
Язык: Английский
N^N^C-Cyclometalated rhodium(iii) complexes with isomeric pyrimidine-based ligands: unveiling the impact of isomerism on structural motifs, luminescence and cytotoxicity
Dalton Transactions,
Год журнала:
2024,
Номер
53(19), С. 8398 - 8416
Опубликована: Янв. 1, 2024
The
degree
of
steric
bulk
in
isomeric
ligands
affects
structural
motifs,
luminescence
and
cytotoxicity
N^N^C-cyclometallated
rhodium(
iii
)
complexes.
Язык: Английский
Ultrafast and Quantitative FRET Sensitization of Singlet Fission in Solution‐Processable Para‐Azaquinodimethane Films
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(40)
Опубликована: Май 21, 2024
Abstract
In
this
work,
a
green
protocol
for
the
synthesis
of
new
para
‐Azaquinodimethane
(pAQM)
small
molecules,
functionalized
with
anisole
(An)
or
bithiophene
(TT)
moieties
on
central
unit
and
different
alkoxy
groups
as
lateral
substituents
is
developed
reported.
The
are
found
to
strongly
impact
solubility
processability
chromophores.
On
other
hand,
steady–state
time‐resolved
spectroscopic
results
show
completely
spectral
photophysical
features
An‐
TT‐
derivatives.
Only
TT‐compounds,
nanosecond
femtosecond
transient
absorption
experiments
reveal
low
efficiency
triplet
production
in
solution
well
ultrafast
(≈1
ps)
efficient
(≈200%)
singlet
fission
(SF)
thin
film.
yellow
An‐containing
molecules
instead
used
sensitize
purple
SF‐active
TT‐compounds
via
quantitative
FRET
mixed
films,
which
interestingly
exhibit
panchromatic
extending
entire
visible
range.
With
study,
synergy
between
SF
exploited
at
intermolecular
level
solid‐state
first
time
by
considering
unconventional
stable
chromophores,
opening
intriguing
possibilities
solar
energy
harvesting.
Язык: Английский
Boosting the Efficiency of Red Thermally Activated Delayed Fluorescence via Conjugation Enhancement in Push‐Pull Naphthalimide Derivatives
Chemistry - A European Journal,
Год журнала:
2024,
Номер
30(57)
Опубликована: Авг. 5, 2024
Abstract
In
this
work,
we
synthesize
a
series
of
push–pull
compounds
bearing
naphthalimide
as
the
electron
acceptor
and
tetraphenylethylene
(TPE)/triphenylamine
(TPA)/phenothiazine
(PTZ)
rich/electron
donor
units.
These
moieties
are
arranged
in
highly
conjugated
quadrupolar
structures.
The
structure–property
relationships
investigated
through
joint
experimental
time–resolved
spectroscopic
computational
TD–DFT
study.
femtosecond
transient
absorption
fluorescence
up–conversion
experiments
reveal
ultrafast
photoinduced
intramolecular
charge
transfer.
This
is
likely
key
factor
leading
to
efficient
spin–orbit
CT–induced
intersystem
crossing
for
TPA–
PTZ–derivatives
well
small
singlet–to–triplet
energy
gap.
Consequently,
evidence
delayed
component
found
together
with
main
prompt
emission
kinetics
both
solution
thin
film.
weight
Thermally
Activated
Delayed
Fluorescence
(TADF)
greatly
enhanced
when
these
fluorophores
used
guests
solid–state
host
matrices.
TADF
interestingly
revealed
orange–red
region
visible.
Such
long
wavelength
here
observed
surprisingly
large
quantum
yields,
thanks
conjugation
enhancement
achieved
newly
synthesized
structures
relative
previous
studies.
Our
findings
may
be
thus
promising
future
development
third
generation
TADF–based
OLEDs.
Язык: Английский
Unlocking the Potential of Push‐Pull Pyridinic Photobases: Aggregation‐Induced Excited‐State Proton Transfer
Chemistry - A European Journal,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 12, 2024
The
pH
effect
on
the
photophysics
of
three
push-pull
compounds
bearing
dimethoxytriphenylamine
(TPA-OMe)
as
electron
donor
and
pyridine
acceptor,
with
different
ortho-functionalization
(-H,
-Br,
-TPA-OMe),
is
assessed
through
steady-state
time-resolved
spectroscopic
techniques
in
DMSO/water
mixed
solutions
water
dispersions
over
a
wide
range.
enhanced
intramolecular
charge
transfer
upon
protonation
pyridinic
ring
leads
to
acidochromic
(from
colorless
yellow)
acido(fluoro)chromic
cyan
pink)
behaviours
investigated
compounds.
In
dilute
DMSO/buffer
mixtures
these
molecules
exhibited
low
pK
Язык: Английский
Ad-Hoc Functionalization of Phenothiazine Dioxide Derivatives to Achieve Blue Thermally Activated Delayed Fluorescence in Organic Nanoaggregates
The Journal of Physical Chemistry C,
Год журнала:
2024,
Номер
128(46), С. 19688 - 19700
Опубликована: Ноя. 8, 2024
In
this
study,
four
new
phenothiazine
dioxide
derivatives
were
synthesized.
They
functionalized
with
rotatable
electron
donor
substituents
characterized
by
different
degree
of
rotatability
(such
as
triphenylamine,
and
tetraphenylethylene)
symmetrically
attached
to
the
central
core.
On
one
hand,
triphenylamine-
phenothiazine-based
molecules
exhibited
efficient
fluorescence
in
blue
portion
visible
spectrum,
consistent
their
modest
push–pull
character.
other
tetraphenylethylene-functionalized
compound
showed
very
low
quantum
yields
an
ultrafast
nonradiative
deactivation
ground
state
via
intramolecular
rotations.
Efficient
intersystem
crossing
(ISC)
was
revealed
through
transient
absorption
experiments
femtosecond
nanosecond
temporal
resolution
for
triphenylamine
derivatives.
Organic
nanoaggregates
investigated
fluorophores
mean
diameters
50–150
nm
prepared
water
dispersion
intriguingly
either
thermally
activated
delayed
(TADF,
triphenylamine-based
dye)
or
aggregation-induced
emission
(AIE,
tetraphenylethylene-based
dye).
Such
organic
nanoparticles
successfully
internalized
human
melanoma
lung
cancer
cells,
exhibiting
nuclear
localization
imaging
some
cytotoxicity.
TADF
interestingly
triphenylamine-functionalized
molecule
also
solid
state,
host–guest
powders
where
triphenylphosphine
employed
host
matrix.
This
emitter
holds
significant
potential
applications
third-
fourth-generation
OLED
devices.
Язык: Английский