Enhanced coherence by coupling spins through a delocalized π-system: Vanadyl porphyrin dimers
Chem,
Год журнала:
2023,
Номер
10(1), С. 299 - 316
Опубликована: Окт. 11, 2023
Vanadium(IV)
magnetic
centers
are
prime
candidates
for
molecular
quantum
units.
One
long-standing
question
is
how
to
obtain
a
scaffold
that
connects
multiple
and
allows
two
communication
modalities:
electronic.
We
have
synthesized
studied
selection
of
vanadyl
porphyrin
dimers
as
models
the
most
synthetically
accessible
linear
arrays.
show
strongly
π-conjugated
backbone
places
system
in
an
intermediate
regime
dominated
by
exchange
coupling
(J)
protects
coherence
against
electron
pair
flip-flop
processes
at
low
temperatures
(<10
K).
This
result
fundamental
step
toward
design
materials
single-molecule
devices
controlled
microwaves
with
electrical
readout.
Язык: Английский
Insights into oxidovanadium (3,4,5-trimethoxyphenyl) porphyrin: A comprehensive study of synthesis, crystal structure, Hirshfeld surface analysis and computational studies
Journal of Molecular Structure,
Год журнала:
2024,
Номер
1315, С. 138764 - 138764
Опубликована: Июнь 2, 2024
Язык: Английский
Vanadyl(IV) Porphyrin Dimers with Palladium(II) and Platinum(II) Linkages: Syntheses, Electronic Properties, and Magnetic Interactions between the Two Moieties
Crystal Growth & Design,
Год журнала:
2023,
Номер
23(3), С. 1689 - 1696
Опубликована: Янв. 27, 2023
We
report
the
synthesis
of
new
vanadyl
porphyrins
bearing
peripheral
coordination
sites.
By
using
palladium(II)
or
platinum(II)
as
connecting
ions,
porphyrin
dimers
were
isolated
and
characterized
by
X-ray
crystallography.
These
paramagnetic
species
studied
electronic
spectroscopy
continuous
wave
electron
resonance
(CW
EPR).
Large
bathochromic
shifts
observed
comparing
monomers
showing
that
delocalization
was
present
demonstrated
earlier
for
diamagnetic
compounds.
Despite
large
distance
(>14
Å)
between
two
centers
in
these
dimers,
small
dipolar
interactions
ions
could
be
determined.
Язык: Английский
Enhanced Coherence by Coupling Spins through a Delocalized π-System: Vanadyl Porphyrin Dimers
Опубликована: Апрель 18, 2023
Vanadium(IV)
magnetic
centers
are
prime
candidates
as
molecular
quantum
units.
One
longstanding
question
is
how
to
obtain
a
scaffold
that
connects
multiple
and
allows
two
communication
modalities:
electronic.
We
have
synthesized
studied
selection
of
vanadyl
porphyrin
dimers,
models
the
most
synthetically
accessible
linear
arrays.
show
strongly
π-conjugated
backbone
places
system
in
strong
coupling
regime
protects
coherence
against
electron
pair
flip-flop
processes
at
low
temperatures
(<10
K).
This
result
fundamental
step
towards
design
materials
for
single-molecule
devices
controlled
by
microwaves
with
electrical
readout.
Язык: Английский
An Exchange Coupled meso-meso Linked Vanadyl Porphyrin Dimer for Quantum Information Processing
Опубликована: Авг. 30, 2022
Molecular
multi-spin
systems
acting
as
potential
quantum
gates
require
fine-tuning
magnetic
interactions
to
achieve
single
spin
addressability
and
entanglement
of
the
qubits.
We
report
here
synthesis
a
new
singly
linked
vanadyl-porphyrin
dimer
that
crystallizes
in
two
different
pseudo-polymorphs.
The
crystal
continuous-wave
Electron
Paramagnetic
Resonance
investigation
evidences
small
but
crucial
isotropic
exchange
interaction,
J,
between
tilted,
thus
distinguishable,
centers
order
10^-2
cm-1.
experimental
DFT
studies
evidence
correlation
J
values
porphyrin
planes
tilting
angle
distortion.
Pulsed
EPR
analysis
shows
vanadyl
dimers
maintain
coherence
time
monomer.
Our
results,
coupled
with
evaporability
systems,
establish
this
class
extremely
promising
for
information
processing
applications.
Язык: Английский