Photochemistry and Photobiology,
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 26, 2024
Abstract
The
impact
of
the
polymeric
matrix
on
photophysical
characteristics
monomeric
dyes
responsive
to
excited‐state
intramolecular
proton
transfer
(ESIPT)
was
investigated
through
UV–Vis
absorption
as
well
steady‐state
and
time‐resolved
emission
spectroscopies.
For
this
purpose,
two
benzoxazole
monomers
(M1
M2)
with
acryloyl
groups
at
different
positions
in
their
molecular
structures
were
employed
facilitate
covalent
bonding
within
a
styrene
chain.
Our
findings
reveal
significant
variations
properties
due
proximity
groups,
which
affects
energy
barrier
ESIPT
reaction,
wavelength,
balance
between
normal
tautomeric
forms.
experimental
results
corroborated
theoretical
investigations
DFT/TDDFT
level,
specifically
using
B3LYP‐D3/def2‐TZVP
methodology.
Three
notable
observations
emerged:
donor/acceptor
meta/para
induced
electron
distribution
changes,
causing
red‐shifted
for
M2;
polymer
film,
particularly
PM1,
hydrogen
bond
deactivation
favored
N*
over
T*
emission;
zwitterionic
character
species.
This
study
underscores
advantages
functionalization
polymers,
can
lead
colorless
films
prevalent
or
emission,
contributes
valuable
insights
into
design
strategies
tailoring
materials.
Molecules,
Journal Year:
2024,
Volume and Issue:
29(11), P. 2542 - 2542
Published: May 28, 2024
Zinc
ions
(Zn2+)
play
a
key
role
in
maintaining
and
regulating
protein
structures
functions.
To
better
understand
the
intracellular
Zn2+
homeostasis
signaling
role,
various
fluorescent
sensors
have
been
developed
that
allow
monitoring
of
concentrations
bioimaging
live
cells
real
time.
This
review
highlights
recent
development
organic
probes
for
detection
imaging
Zn2+,
including
design
construction
probes,
response
mechanisms,
their
applications
to
on-site.
Finally,
current
challenges
prospects
are
discussed.
Advanced Science,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 17, 2024
Abstract
Excited‐state
intramolecular
proton
transfer
(ESIPT)
has
attracted
great
attention
in
fluorescent
sensors
and
luminescent
materials
due
to
its
unique
photobiological
photochemical
features.
However,
the
current
structures
are
far
from
meeting
specific
demands
for
ESIPT
molecules
different
scenarios;
try‐and‐error
development
method
is
labor‐intensive
costly.
Therefore,
it
imperative
devise
novel
approaches
exploration
of
promising
fluorophores.
This
research
proposes
an
artificial
intelligence
approach
aiming
at
exploring
efficiently.
The
first
high‐quality
dataset
a
multi‐level
prediction
system
constructed
that
realized
accurate
identification
large
number
compounds
under
stepwise
distinguishing
conventional
then
molecules.
Furthermore,
key
structural
features
contributed
revealed
by
using
SHapley
Additive
exPlanations
(SHAP)
method.
Then
three
strategies
proposed
ensure
process
while
keeping
good
safety,
pharmacokinetic
properties,
structures.
With
these
strategies,
>700
previously
unreported
screened
pool
570
000
compounds.
biosafety
optimal
successfully
validated
quantitative
calculation
experiment.
expected
bring
new
paradigm
ideal
Inorganic Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 2, 2025
This
work
contributes
to
luminescent
molecular
switches
featuring
several
emission
pathways,
which
can
be
activated
by
external
stimuli.
We
designed
Zn
complexes
with
phenylbenzothiazole-based
α-aminomethylphosphine
oxide
(L)
and
isolated
them
as
crystalline
phases,
α-[ZnL2Cl2],
[ZnL(EtOAc)Cl2],
[ZnL2Cl2]·1.5CH2Cl2,
[ZnL2Cl2]·1.5CHCl3.
They
feature
an
intramolecular
hydrogen
bond
of
medium
strength,
capable
excited-state
proton
transfer
(ESIPT),
well
able
for
intersystem
crossing
between
singlet
triplet
states.
Since
neither
these
processes
is
predominant,
one
or
the
other
occur
depending
on
a
slight
change
in
geometry.
The
phases
reveal
red-colored
ESIPT
fluorescence,
while
metastable
amorphous
phase
β-[ZnL2Cl2]
similar
structure
coordination
center
reveals
yellow-colored
room-temperature
phosphorescence.
Combined
experimental
quantum-chemical
TD-DFT
study
clarified
dual
behavior
polymorphs
α-[ZnL2Cl2]
β-[ZnL2Cl2],
attributed
high
dependence
probability
geometry
phenylbenzothiazole
moiety.
reversible
transition,
accompanied
mechanism
(ESIPT
fluorescence
vs
phosphorescence),
manipulated
fuming
CHCl3
Et2O,
respectively.
have
demonstrated
good
adhesive
properties
polymer-free
film
toward
glass
plastic,
naked-eye
color
response
easy
recovery
CHCl3.
Physchem,
Journal Year:
2024,
Volume and Issue:
4(1), P. 91 - 105
Published: March 11, 2024
The
tautomerism
in
the
title
compound
as
a
potential
long-range
proton
transfer
(PT)
switch
has
been
studied
by
using
DFT
and
TD-DFT
approaches.
data
show
that
aprotic
solvents,
enol
tautomer
dominates,
while
increase
content
of
keto
(short-range
PT)
rises
function
polarity
solvent.
In
ethanol,
due
to
specific
solute–solvent
stabilization
through
intermolecular
hydrogen
bonding,
substantial
amount
forms
exists
solution.
irradiation
leads
two
competitive
processes
excited
state,
namely
ESIPT
trans/cis
isomerization
around
azomethine
bond
other
structurally
similar
Schiff
bases.
is
not
suitable
for
bistable
tautomeric
switching,
where
PT
occurs,
difficult
enolization
coumarin
carbonyl
group.
Molecules,
Journal Year:
2025,
Volume and Issue:
30(3), P. 531 - 531
Published: Jan. 24, 2025
There
is
currently
a
growing
interest
in
imino
derivatives
of
compounds
such
as
thiadiazoles
and
other
groups
whose
extended
π-electron
systems
enhance
their
photophysical
properties.
These
also
show
low
toxicity
strong
antifungal
activity,
making
them
effective
against
fungal
pathogens
crops.
For
the
above
reasons,
first
part
paper,
structure
selected
analogs
was
considered,
detailed
spectroscopic
analyses
were
conducted
focusing
on
excited
state
intramolecular
proton
transfer
(ESIPT)
process
taking
place
same.
Measurements
taken
terms
absorption
spectroscopy
electron
fluorescence,
synchronous
spectra,
fluorescence
lifetimes,
well
calculations
quantum
efficiency
solvents
concentrations.
In
spectral
observations,
ESIPT
manifested
several
very
distinct
dual
fluorescence.
Moreover,
molecules,
this
phenomenon
strongly
related
to
molecular
aggregation,
which
associated
with
not
efficient
but
nonetheless
visible
AIE
(Aggregation-Induced
Emission)
type.
second
preliminary
study
presented
exploring
microbiological
properties
imino-1,3,4-thiadiazole
context
potential
applicability
inhibitors
affecting
development
growth
some
most
important
attacking
cereal
crops
posing
an
increasing
threat
modern
agriculture.
Overall,
research
article
provides
detailed,
experimental
analysis
imino-thiadiazoles
points
use
novel
solutions
capable
limiting
cereals.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 6, 2025
Photoinduced
proton
transfer
is
an
essential
photochemical
process
for
designing
photocatalysts,
white
light
emitters,
bioimaging,
and
fluorescence
sensing
materials.
However,
deliberate
control
of
the
excited/ground
states
meticulous
manipulation
excited
state
intramolecular
(ESIPT)
pathway
constitute
a
significant
challenge
in
liquids
dense
solids.
Here,
we
present
integration
hydronaphthoquinone
fluorophore
into
crystalline,
porous,
phototautomeric
dynamic
3D
covalent
organic
framework
(COF)
to
show
guest-induced
turn-on,
emission
redshift
enhancement,
shortened
lifetimes
ratiometric
humidity
sensing.
Theoretical
spectroscopic
studies
provide
mechanistic
insights
conformational
dynamics,
charge
coupled
with
local
excitation,
ground-state
uphill
regulation
multiple
tautomers.
We
illustrate
sensitive,
rapid,
steady,
self-calibrated
wide
range
benefiting
from
architectural
chemical
robustness
crystallinity
such
COF.
These
findings
molecular
design
functional
porous
materials
that
integrate
host-guest
mutual
recognition
photoelectronic
response
multiplex
environmental
monitoring
biomedical
diagnostics
applications.
Zn(II)
complexes
based
on
salicylaldehyde
hydrazone
ligands
have
emerged
as
a
promising
class
of
stimuli-responsive
luminescent
materials.
Herein,
three
complexes,
namely,
[Zn2(HL1)2(py)2]·H2O
(1a),
Zn2(HL1)2(py)2
(1b),
and
Zn2(HL2)2(py)2
(2),
were
synthesized
by
self-assembly
with
under
solvothermal
conditions.
Complexes
1a
2
exhibit
reversible
mechanochromic
luminescence
(MCL)
during
grinding
fuming
processes
due
to
the
transformation
between
crystalline
phase
amorphous
phase.
In
addition,
slight
induces
crystal
from
1b.
Comprehensive
structural
analysis
experimental
results
indicate
that
may
destroy
coordination
bond,
leading
dissociation
pyridine
molecule
metal
center.
Besides,
existence
weak
interaction
molecules
is
easy
upon
external
mechanical
force,
resulting
in
MCL
high
contrast.
Moreover,
DMSO
solutions
both
turn
yellow
colorless
accompanied
quenching
after
irradiating
white
light.
shows
photochromism
switching
light
365
nm
UV
illumination
short
response
time,
while
prolonged
irreversible
response,
potentially
attributed
steric
hindrance
effects.
However,
complex
exhibits
more
obvious
photochromic
property
solid
state
than
1a.
Its
color
changes
brown
irradiation
light,
formation
radicals
generated
photoinduced
electron
transfer
hydroxyl
oxygen
atom
coordinating
molecule.
The
PMMA
film
also
stimuli
or
These
exhibiting
properties,
demonstrate
significant
potential
advanced
multistimuli
responsive
materials
for
various
applications.
New Journal of Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
The
development
of
dual-state
emission
luminogens
(DSEgens),
which
exhibit
strong
in
solution
and
aggregated
states,
holds
great
promise
for
various
practical
applications
due
to
their
persistent
fluorescence
signals.