ACS Omega,
Journal Year:
2024,
Volume and Issue:
9(52), P. 51652 - 51664
Published: Dec. 17, 2024
The
complex
formation
of
the
cationic
stilbene-type
photoswitch
CP
with
anionic
macrocycles
carboxylato-pillar[5]arene
(WP5)
and
carboxylato-pillar[6]arene
(WP6)
has
been
investigated
in
aqueous
solution
by
optical
spectroscopic,
NMR
isothermal
calorimetric
experiments
theoretical
calculations.
Subsequently,
photoisomerization
reactions
supramolecular
complexes
formed
have
studied.
consists
a
7-diethylamino-coumarin
fluorophore
an
N-methylpyridinium
unit,
which
are
connected
via
ethene
bridge.
trans
isomer
is
fluorescent,
its
cis
dark.
binding
constants
WP6
two
photoisomers
larger
2
orders
magnitude
than
those
respective
WP5,
trans-CP
forms
more
stable
individual
pillararenes
isomer.
As
shown
spectroscopic
measurements
calculations,
isomers
form
external
WP5
inclusion
WP6.
On
complexation
WP6,
quantum
yields
both
trans-to-cis
cis-to-trans
increase
significantly,
fluorescence
yield
also
enhanced.
These
changes
due
to
suppression
TICT
deactivation
process,
characteristic
7-dialkylamino-coumarin
derivatives.
Communications Physics,
Journal Year:
2024,
Volume and Issue:
7(1)
Published: Aug. 8, 2024
Abstract
The
photophysical
and
photochemical
properties
of
push–pull
photoswitches,
such
as
stilbene
derivatives,
are
very
sensitive
to
their
surroundings,
allowing,
e.g.,
for
the
control
spectral
or
alternatively
probing
molecular
environment.
Here,
we
investigate
how
various
adsorption
motifs
4-(N,
N-Dimethylamino)-4’-nitrostilbene
(DANS)
on
an
amorphous
glass
surface
influence
its
absorption
spectra.
Particular
attention
is
given
prominent
first
bright
charge
transfer
state
factors
governing
these
modifications.
spectra
simulated
using
time-dependent
density
functional
theory
a
large
set
geometries
that
exhibit
different
kinds
molecule–surface
interactions.
We
find
C–H⋯O
interactions
methyl
phenyl
moieties
with
affect
spectrum
only
marginally,
whereas
dispersion
interaction
π
system
tends
diminish
intensity
band.
Moreover,
enhancement
DANS
significant
redshift
occur
whenever
O–H⋯O
hydrogen
bonds
NO
2
group
present,
bond
O–H⋯N
NMe
results
in
blueshift.
Organic Letters,
Journal Year:
2024,
Volume and Issue:
26(39), P. 8389 - 8393
Published: Sept. 25, 2024
We
report
new
photoluminescent
switching
systems
achieved
through
pH-induced
intramolecular
oxa-Michael
conjugate
addition
reactions.
Ratiometric
absorbance
and
fluorescence
emission
were
observed
across
acceptors
triggered
by
pH,
resulting
in
specific
pseudo
p
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 29, 2024
Abstract
Independently‐manipulated
optical
encryption
has
attracted
great
attention
due
to
its
high
security
and
multiple
application
scenarios.
Although
photochromic
molecules
have
become
preferred
holographic
display
units,
the
integration
of
dynamic
modulation
both
in
hologram
fluorescence
for
orthogonal
is
still
challenged.
Herein,
a
latticed
holographically
steganographic
array
constructed
by
incorporating
plasticizer
(tri‐o‐cresyl
phosphate,
TOCP)
into
spirooxazine
(SO)
based
polymers,
thereby
modulating
isomerization
rate
UV‐fluorescence
kinetics
between
SO
merocyanine
(MC).
The
period
reach
saturated
value
each
information
bit
device
can
be
widely
modulated
60
1700
s.
Based
on
property,
only
through
ultraviolet
stimulation
gradually
converted
from
spatial
lattice
coordinates
time.
Then,
hidden
3D
image
determined
rapidly
updatable
reconstructed
video
with
refresh
1.125
Hz
above
spatiotemporal
dual‐encryption
keys.
This
work
provides
bright
path
ultra‐high
safety
steganography
adaptive
stereoscopic
imaging.
ACS Omega,
Journal Year:
2024,
Volume and Issue:
9(52), P. 51652 - 51664
Published: Dec. 17, 2024
The
complex
formation
of
the
cationic
stilbene-type
photoswitch
CP
with
anionic
macrocycles
carboxylato-pillar[5]arene
(WP5)
and
carboxylato-pillar[6]arene
(WP6)
has
been
investigated
in
aqueous
solution
by
optical
spectroscopic,
NMR
isothermal
calorimetric
experiments
theoretical
calculations.
Subsequently,
photoisomerization
reactions
supramolecular
complexes
formed
have
studied.
consists
a
7-diethylamino-coumarin
fluorophore
an
N-methylpyridinium
unit,
which
are
connected
via
ethene
bridge.
trans
isomer
is
fluorescent,
its
cis
dark.
binding
constants
WP6
two
photoisomers
larger
2
orders
magnitude
than
those
respective
WP5,
trans-CP
forms
more
stable
individual
pillararenes
isomer.
As
shown
spectroscopic
measurements
calculations,
isomers
form
external
WP5
inclusion
WP6.
On
complexation
WP6,
quantum
yields
both
trans-to-cis
cis-to-trans
increase
significantly,
fluorescence
yield
also
enhanced.
These
changes
due
to
suppression
TICT
deactivation
process,
characteristic
7-dialkylamino-coumarin
derivatives.
