Polymers,
Journal Year:
2023,
Volume and Issue:
15(15), P. 3325 - 3325
Published: Aug. 7, 2023
Preparing
strong
and
flexible
atelocollagen-based
materials
for
biomedical
applications
is
still
a
challenging
task.
To
address
this
challenge,
study
describes
the
synthesis
characterization
of
water-soluble
polyrotaxanes
(PRs)
with
different
coverage
ratios
molecular
weights
axle
polymers,
their
potential
PR-reinforced
atelocollagen
threads
(PRATs).
A
novel
method
was
established
syntheses
PRs
relatively
low
ratio
at
sub-gram
scale,
in
which
aldehyde
groups
were
employed
as
crosslinking
sites
preparing
PRATs
via
reductive
amination.
The
successfully
quantified
by
1H
nuclear
magnetic
resonance
spectroscopy
using
1,1-dimethylhydrazine
an
marker.
Fourier-transform
infrared
thermogravimetric
analysis
measurements
supported
PRs.
Interestingly,
tensile
testing
demonstrated
that
affected
mechanical
properties
more
strongly
than
weight.
insights
obtained
would
facilitate
development
soft
based
on
atelocollagens
ACS Applied Nano Materials,
Journal Year:
2024,
Volume and Issue:
7(9), P. 10130 - 10136
Published: April 25, 2024
Herein,
we
designed
and
prepared
one
cobalt–nitrogen-doped
carbon
(Co–N/C)
nanoparticle
catalyst
with
a
metal–ligand
cooperation
(MLC)
effect,
where
the
MLC
concept
is
significant
in
catalytic
hydrogenation
reactions
but
limited
to
homogeneous
catalysts.
The
nanoparticles
Co–N/C
size
of
138–172
nm
catalyzed
diverse
organic
high
efficiency
selectivity,
including
reductive
formylation
nitroarenes
formic
acid,
C–N
coupling
between
alcohols
amines,
selective
quinolines
H2.
Detailed
spectroscopic
characterizations
controlled
experiments
revealed
that
Co–N
species
catalytically
active
site.
In
addition,
recycled
showed
outstanding
stability
reusability.
Therefore,
demonstrated
be
effective
heterogeneous
catalysts
as
well,
paving
way
discover
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(30)
Published: May 18, 2023
A
method
for
rotaxane
synthesis
by
enlargement
of
the
size
terminal
phenol
group
axle
component
aromatic
bromination
has
been
developed.
This
may
be
regarded
as
an
end-capping
strategy
involving
swelling
at
terminal.
The
advantages
present
include:
ready
availability
components
with
a
variety
precursors,
wide
product
scope
(19
examples
given
including
[3]rotaxane),
mild
conditions
process,
rich
potential
derivatization
brominated
rotaxanes,
and
possible
release
degradative
dethreading
thermally
stable
rotaxanes
under
basic
conditions.
Organic & Biomolecular Chemistry,
Journal Year:
2023,
Volume and Issue:
21(45), P. 9070 - 9075
Published: Jan. 1, 2023
In
this
study,
we
show
the
effect
of
gem-dimethyl
substitution
at
four
benzylic
carbons
ring
on
internal
dynamics
two-station
[2]rotaxanes.
Such
structural
modification
polyamide
macrocycles
promotes
a
drastic
change
as
shown
by
variable-temperature
(VT)
1H
NMR
experiments.
We
determined
that
shuttling
rates
octamethylated
macrocycle
along
series
symmetrical
threads
were
significantly
faster
compared
to
non-substituted
ring.
This
was
particularly
pronounced
in
fumaramide-based
system,
which
rate
27
times
than
model
system.
Beilstein Journal of Organic Chemistry,
Journal Year:
2023,
Volume and Issue:
19, P. 873 - 880
Published: June 14, 2023
Light-responsive
rotaxane-based
solid-state
materials
are
ideal
scaffolds
in
order
to
develop
smart
due
the
properties
provided
by
mechanical
bond,
such
as
control
over
dynamics
of
components
upon
application
external
stimuli.
This
perspective
aims
highlight
relevance
these
materials,
pointing
out
recent
examples
photoresponsive
prepared
from
a
rotaxanated
architecture
which
motion
counterparts
and/or
macroscopic
interlocked
achieved.
Although
further
development
is
needed,
envisioned
privileged
will
be
used
for
different
advanced
applications
area
molecular
machinery.
Polymers,
Journal Year:
2023,
Volume and Issue:
15(15), P. 3325 - 3325
Published: Aug. 7, 2023
Preparing
strong
and
flexible
atelocollagen-based
materials
for
biomedical
applications
is
still
a
challenging
task.
To
address
this
challenge,
study
describes
the
synthesis
characterization
of
water-soluble
polyrotaxanes
(PRs)
with
different
coverage
ratios
molecular
weights
axle
polymers,
their
potential
PR-reinforced
atelocollagen
threads
(PRATs).
A
novel
method
was
established
syntheses
PRs
relatively
low
ratio
at
sub-gram
scale,
in
which
aldehyde
groups
were
employed
as
crosslinking
sites
preparing
PRATs
via
reductive
amination.
The
successfully
quantified
by
1H
nuclear
magnetic
resonance
spectroscopy
using
1,1-dimethylhydrazine
an
marker.
Fourier-transform
infrared
thermogravimetric
analysis
measurements
supported
PRs.
Interestingly,
tensile
testing
demonstrated
that
affected
mechanical
properties
more
strongly
than
weight.
insights
obtained
would
facilitate
development
soft
based
on
atelocollagens
