Reported
are
the
syntheses,
structural
characterizations
and
luminescence
properties
of
three
novel
[UO2Cl4]2
bearing
compounds
containing
substituted
1,1’-dialkyl-4,4’-bipyridinum
dications
(i.e.
viologens).
These
undergo
photoinduced
quenching
upon
exposure
to
UV
radiation.
Kinetic
analyses
indicate
degree
follows
a
second-order
rate
law
with
constant
dependent
on
viologen
substituent.
This
phenomenon
is
proposed
involve
formal
transfer
one
electron
from
[UO2Cl4]2-
species.
mechanism
supported
through
series
calculations
computational
work
including
Rehm-Weller
analysis,
time-dependent
density
functional
theory
(TD-DFT),
states
(DOS).
constitutes
first
study
an
oxidized
uranyl
complex
anion
which
expands
conventional
understanding
photoreactivity.
Dalton Transactions,
Год журнала:
2024,
Номер
53(11), С. 5192 - 5201
Опубликована: Янв. 1, 2024
A
new
type
of
POM–metaloxoviologen
hybrid
with
a
3D
trinuclear
Zn(
ii
)–viologen
framework
encapsulating
POMs
exhibits
multiple
stimulus-responsive
behaviors.
Inorganic Chemistry,
Год журнала:
2022,
Номер
61(21), С. 8153 - 8159
Опубликована: Май 17, 2022
Donor-acceptor
(D-A)
hybrid
frameworks
with
visual
X-ray
photochromism
at
room
temperature
are
fascinating
because
of
their
promising
applications
as
detectors.
Herein,
a
3-fold
interpenetrated
D-A
framework,
[Eu(bcbp)1.5(DMF)(H2O)2][Co(CN)6]·4H2O·CH3OH
(1),
has
been
obtained
by
incorporating
electron-rich
Co(CN)63-
into
the
electron-deficient
europium
viologen
which
interestingly
exhibits
ultraviolet
and
low-power
dual
remarkable
color
change
from
brown
to
green.
Experimental
theoretical
studies
revealed
that
photochromic
behavior
1
could
be
attributed
its
structural
feature
increasing
extent
photoinduced
electron
transfer
thus
photogenerated
radical
species
upon
irradiation.
Meanwhile,
due
introduction
emissive
lanthanide
cations
in
system,
photomodulated
luminescence
properties.
Journal of Materials Chemistry C,
Год журнала:
2024,
Номер
12(17), С. 6326 - 6332
Опубликована: Янв. 1, 2024
A
photochromic
material
based
on
viologen
was
synthesized.
During
the
photo-induced
color
transition,
DC
magnetic
susceptibility
enhanced
by
48%,
and
an
increase
in
relaxation
time
after
illumination
observed.
Abstract
Viologen,
as
a
type
of
strong
electron
acceptor,
is
prone
to
undergo
transfer
(ET)
and
change
color
under
external
stimuli.
However,
due
the
easy
aggregation
viologen
molecules,
they
usually
suffer
from
poor
fluorescence
emission
in
condensed
phase.
Herein,
new
derivative
VioCl
2
·2Cl
(
1
2+
·2Cl)
was
designed
synthesized,
which
enhanced
by
introducing
Me‐β‐CD
weaken
interactions
between
molecules.
Then
viologen‐based
host–guest
supramolecule
@Me‐β‐CD
obtained
electrostatic
interactions.
Photo‐/chemo‐responded
guest
supplies
,
green
dark
purple
caused
intramolecular
intermolecular
ET.
Furthermore,
displays
an
additional
thermal
responsive
color.
The
triple
chromic
behaviors
all
exhibit
excellent
reversibility
cycling
stability.
As
expected,
exhibits
photoluminescence
(PL)
solid–liquid
dual
states,
presenting
improved
quantum
yield
(Φ)
(Φ
s
=
0.37%,
Φ
l
16.74%)
10.45%,
25.86%),
intensity
can
be
dynamically
modulated
light,
heat,
acid/base
vapors.
multi‐responsive
chromism
tunable
allow
for
potential
applications
information
security
smart
windows.
Abstract
Semiconductive
metal–organic
frameworks
(MOFs)
with
donor–acceptor
(D–A)
characteristics
have
garnered
attractive
attention
due
to
their
capacity
for
separating
and
transferring
photogenerated
charges,
making
them
promising
candidates
high‐performance
X‐ray
detectors.
However,
the
low
charge
transfer
efficiency
between
metal
nodes
organic
ligands
limits
X‐ray‐to‐electricity
conversion
of
these
materials.
Herein,
an
additional
photoactive
donor
(D’)
is
introduced
by
incorporating
a
heavy
atom‐containing
polyoxometalate
(POM)
[α‐SiW
12
O
40
]
4−
into
binary
{[Ni·bcbp·(H
2
O)
]·(H
4
·Cl}
n
(Ni‐bcbp,
bcbp:
H
bcbp·2Cl
=
1,1′‐bis(4‐carboxyphenyl)(4,4′‐bipyridinium)
dichloride)
MOF,
resulting
in
semiconductive
ternary
D‐D'‐A
framework
{[Ni
(bcbp)
·(H
·(DMA)]·(SiW
)}
(SiW@Ni‐bcbp,
DMA:
dimethylacetamide).
The
obtained
material
features
unprecedented
porous
8‐connected
bcu‐net
structure
that
accommodates
nanoscale
counterions,
displaying
uncommon
optoelectronic
responses.
In
contrast
Ni‐bcbp,
SiW@Ni‐bcbp
exhibits
distinctive
photochromism
robust
responsiveness,
which
can
be
attributed
synergistic
effects
electron
reservoir
multiple
photoinduced
originating
from
POMs.
As
result,
detector
based
on
demonstrates
sensitivity
5741.6
µC
Gy
air
−1
cm
−2
detection
limit
0.49
µGy
s
.
Moreover,
devices
demonstrated
capability
producing
clearness
images,
providing
feasible
stable
solution
constructing
direct
