Organic Letters,
Год журнала:
2024,
Номер
26(25), С. 5380 - 5385
Опубликована: Июнь 17, 2024
We
report
the
synthesis
of
bis(benzooxa)-2,6-anthraquinodimethane
(BAQ)
derivative
and
its
bisindeno
fused
analogue
BIBAQ.
found
fusion
on
quinoidal
zigzag
edge
BAQ
results
in
decreased
diradical
character
corresponding
increased
photostability.
Furthermore,
could
only
be
oxidized
into
cationic
species,
while
BIBAQ
showed
balanced
redox
properties.
Chinese Journal of Chemistry,
Год журнала:
2024,
Номер
42(23), С. 3069 - 3074
Опубликована: Авг. 1, 2024
Comprehensive
Summary
Construction
of
helicenes
by
inducing
heteroatoms
has
regarded
as
an
effective
strategy
to
enhance
the
chiroptical
properties.
We
report
a
facile
synthesis
multiple
helicene
based
on
four
indoles
with
two
electron‐rich
NBN‐coved
edges.
The
structure
was
confirmed
single‐crystal
X‐ray
diffraction
analysis,
revealing
twisted
double
[5]helicene
motif
saddle‐shaped
skeleton.
This
showed
strong
green
fluorescence
good
photoluminescence
quantum
yield.
Both
theoretical
calculations
and
experimental
investigation
have
been
exploited
probe
impact
NBN
units
aromaticity
photophysical
properties
helicene.
Chinese Journal of Chemistry,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 13, 2024
Comprehensive
Summary
A
design
strategy
towards
stable
fluorenyl
radicals
(
FR
s)
has
been
developed
through
introducing
donor‐π‐radical
(D‐π‐R)
conjugation,
facilitated
by
the
linkage
of
amine
N
atoms
and
centers
via
phenyl
or
9‐anthryl
moieties.
Four
s,
with
without
atom
containing
protecting
groups,
were
designed
synthesized
for
comparative
analysis.
X‐ray
crystallographic
studies
revealed
planar
skeletons
CDP‐FR
MA‐FR
,
which
exhibit
significant
dihedral
angles
relative
to
their
groups.
Wiberg
bond‐order
analysis
natural
bond
orbital
conducted
on
C‐C
C‐N
between
radical
center
in
all
s
clearly
demonstrated
presence
D‐π‐R
conjugation.
Furthermore,
time‐dependent
DFT
calculations,
based
frontier
molecular
analysis,
highlighted
contribution
structures
as
donor‐acceptor
effect
lowest
energy
absorptions
carbazole
diphenylamine
substituted
DPAA‐FR
would
promote
charge
transfer
process
inhibit
photodegradation
reaction.
Consequently,
beneficial
from
conjugations,
exhibited
superior
photostability
compared
TP‐FR
.
Our
study
offers
a
new
synthesis
persistent
monoradicals.
