One-Component Stilbene-Based Iodonium Photoinitiators with Increased Photoacid Quantum Yield for Cationic Vat 3D Printing
Macromolecules,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 17, 2024
New
advanced
iodonium
salts
based
on
stilbene
chromophores
with
significantly
improved
photoinitiating
properties
are
presented.
The
extended
conjugated
double
bond
system
provides
major
improvement
in
quantum
yield
of
superacid
generation
(up
to
10
times
higher
compared
benzylidene-based
salts)
while
maintaining
absorption
UV-A
and
visible
light.
newly
developed
exhibit
activity
toward
cationically
polymerizable
monomers
such
as
cyclic
epoxy
(e.g.,
3,4-epoxycyclohexylmethyl
3,4-epoxycyclohexane-carboxylate
(CADE)),
oxetanes
bis[1-ethyl(3-oxetanyl)]methyl
ether
(OXT-221))
glycidyl
diglycidyl
bisphenol
A
(DGEBA))
under
the
irradiation
by
light-emitting
diodes
(LEDs)
emitting
at
365,
405
even
430
nm,
no
additives.
Commonly
used
diaryliodonium
photoinitiators
inactive
those
wavelengths.
Moreover,
some
new
also
able
photoinitiate
free
radical
photopolymerization
acrylate
monomers,
trimethylolpropane
triacrylate
(TMPTA).
Such
high
allows
these
be
one-component
cationic
vat
3D
printing
nanocomposites
ambient
temperature.
resolution
prints
was
limited
mainly
DLP
printer
slight
signs
overpolymerization.
Язык: Английский
Cobalt(III) Complexes of Pyridine-Functionalized Chelating NHC Ligands: Effective Catalysts for the Olefination of Alcohols Using Sulfones
Misba Siddique,
Mehali Das,
Arnab Rit
и другие.
Organometallics,
Год журнала:
2024,
Номер
43(13), С. 1482 - 1489
Опубликована: Июнь 26, 2024
Several
air-stable
cobalt(III)
complexes
1a-d
featuring
pyridine-functionalized
NHC
ligand
systems
were
synthesized
and
completely
characterized.
These
then
explored
as
phosphine-free
catalysts
for
the
olefination
of
alcohols
with
sulfones,
among
studied
here,
benzimidazolylidene-supported
1b
complex
acetylacetonate
(acac)
a
labile
co-ligand
was
noted
to
be
most
active
one,
which
also
successful
broad
range
sulfones
providing
diverse
olefins.
It
is
important
mention
that
this
first
example
such
protocol
catalyzed
by
cobalt.
Furthermore,
utility
present
demonstrated
gram-scale
reaction
postsynthetic
modifications
obtained
compounds.
Finally,
based
on
various
control
experiments
including
detection
intermediates
kinetic
studies,
plausible
mechanism
proposed.
Язык: Английский