Physical Chemistry Chemical Physics,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
During
the
last
decade,
there
has
been
an
increasing
interest
in
rationalisation
of
how
structural
changes
stabilise
(or
destabilise)
diradical
systems.
Demonstrated
herein
is
that
indolocarbazole
(ICz)
diradicals,
substituted
with
dicyanomethylene
(DCM)
groups,
are
useful
motifs
for
dynamic
covalent
chemistry
by
self-assembling
from
isolated
monomers
to
cyclophane
structures.
The
comparison
ICz-based
systems
DCM
groups
Chemical Science,
Journal Year:
2024,
Volume and Issue:
15(9), P. 3290 - 3299
Published: Jan. 1, 2024
Multi-addressable
molecular
switches
with
high
sophistication
are
creating
intensive
interest,
but
challenging
to
control.
Herein,
we
incorporated
ring-chain
dynamic
covalent
sites
into
azoquinoline
scaffolds
for
the
construction
of
multi-responsive
and
multi-state
switching
systems.
The
manipulation
equilibrium
by
acid/base
reactions
primary/secondary
amines
allowed
regulation
E/Z
photoisomerization.
Moreover,
carboxyl
quinoline
motifs
provided
recognition
handles
chelation
metal
ions
turning
off
photoswitching,
otherwise
inaccessible
Z-isomer
complexes
obtained
via
change
stimulation
sequence.
Particularly,
distinct
binding
behaviors
primary
amine
secondary
products
offered
a
facile
way
modulating
reactivity.
As
result,
multiple
control
azoarene
photoswitches
was
accomplished,
including
light,
pH,
ions,
nucleophiles,
interplay
between
diverse
stimuli
further
enabling
addressable
within
reaction
networks.
underlying
structural
mechanistic
insights
were
elucidated,
paving
creation
complex
systems,
assemblies,
intelligent
materials.
Organic & Biomolecular Chemistry,
Journal Year:
2025,
Volume and Issue:
23(10), P. 2498 - 2509
Published: Jan. 1, 2025
Dynamic
covalent
macrocycles
offer
the
advantage
of
tunable
ring-opening/ring-closure
and
structural
transformation,
but
their
control
with
precision
remains
a
daunting
task
due
to
labile
nature
reversible
bonds.
Herein
we
demonstrate
precise
formation/scission
varied
sizes
by
contrasting
reactivity,
stability,
degradability
light-active
light-inactive
dynamic
The
incorporation
photoswitchable
non-photoresponsive
aldehyde
sites
into
one
single
dialdehyde
component
afforded
creation
[1
+
1]
type
primary
diamines
suitable
lengths.
manipulation
light
acid/base
stimuli
allowed
on-demand
breaking/remaking
macrocycles,
achieving
interconversion
between
macrocyclic
linear
skeletons.
Moreover,
combination
dialdehyde,
diamines,
secondary
enabled
construction
hetero-type
[2
1
1']
via
enhanced
discrimination
hierarchical
assembly.
Light-induced
kinetic
locking/unlocking
bonds
further
macrocycle-to-macrocycle
conversion
when
needed.
Through
leveraging
controllable
connection/disconnection,
switchable
formation/disintegration
mechanically
interlocked
catenanes
was
accomplished.
results
described
showcase
potential
photoinduced
chemistry
for
preparing
complex
architectures
should
set
stage
molecular
recognition,
assemblies,
synthetic
motors,
responsive
materials.
Organic Letters,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 3, 2025
The
impact
of
varied
chalcogen
bonds
(sulfur,
selenium,
tellurium,
and
telluronium)
on
dynamic
imine
chemistry
in
aqueous
solution
is
presented
by
introducing
a
carboxylate
group
or
cationic
telluronium
into
arylaldehydes.
role
bonding
regulating
the
kinetics
thermodynamics
formation/exchange
was
elucidated
through
experimental
computational
evidence,
affording
largest
effect
for
tellurium/telluronium
compounds.
By
leveraging
multivalent
bonding,
telluronium-containing
aldehyde
enabled
labeling
N-terminus
amino
acids
neutral
buffer.
Chinese Journal of Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 16, 2025
Comprehensive
Summary
The
visible
light‐driven
photoswitches
are
attracting
widespread
attention,
but
it
is
challenging
to
leverage
their
phototriggered
structural
changes
regulate
dynamic
bonds,
assemblies,
and
materials.
Herein,
we
incorporated
reversible
covalent
sites
of
aldehyde
ring‐chain
tautomers
into
all‐visible‐light
azobenzenes
toward
a
versatile
platform
for
light‐controlled
formation/exchange
C—N
bonds
from
secondary
amines.
movement
equilibrium
was
attained
via
manipulating
intramolecular
multiple
hydrogen
bonding
E
/
Z
configurational
isomers.
Such
regulation
further
enabled
photocontrolled
kinetics
the
formation
exchange
reactions
cyclic
hemiaminal
ethers
amines
exhibiting
kinetic
rate
reversal
varied
capability
isomers
in
engaging
azo
attached
carboxylate
with
ammonium
salt
accounts
difference.
Moreover,
photoswitching
performance
different
solutions
readily
regulated
by
reactivity
control
light
associated
mechanistic
foundation
add
collection
photoswitchable
chemistry
would
lay
subsequent
biological
material
applications.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(29)
Published: April 25, 2024
Multiple
dynamic
libraries
of
compounds
are
generated
when
more
than
one
reversible
reaction
comes
into
play.
Commonly,
two
or
orthogonal
reactions
used,
leading
to
non-communicating
which
share
no
building
blocks.
Only
a
few
examples
communicating
have
been
reported,
and
in
all
those
cases,
blocks
reversibly
exchanged
from
library
the
other,
constituting
an
antiparallel
covalent
system.
Herein
we
report
that
communication
between
different
through
irreversible
process
is
also
possible.
Indeed,
alkyl
amines
cancel
regime
on
nucleophilic
substitution
tetrazines,
generating
kinetically
inert
compounds.
Interestingly,
such
amine
can
be
part
another
library,
imine-amine
exchange.
Thus,
both
interconnected
with
each
other
by
leads
structures
contain
parts
libraries,
causing
collapse
complexity.
Additionally,
latent
intercommunication
could
developed.
In
way,
stable
molecular
system
specific
host-guest
fluorescence
properties,
irreversibly
transformed
right
stimulus
was
applied,
triggering
cancellation
original
supramolecular
luminescent
properties
emergence
new
ones.
Chemical Communications,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
Flexible
shape-editable
transparent
wood
was
prepared
by
addition
reaction
and
free
radical
polymerization.
The
skeleton
promotes
directional
enhancement
energy
dissipation,
the
acetal
linkages
ensure
shape
memory
editability.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
unknown
Published: April 15, 2024
Studies
of
complex
systems
and
emerging
properties
to
mimic
biosystems
are
at
the
forefront
chemical
research.
Dynamic
multistep
cascades,
especially
those
exhibiting
allosteric
regulation,
challenging.
Herein,
we
demonstrate
a
versatile
platform
photoswitchable
covalent
cascades
toward
remote
bidirectional
control
reversible
bonds
ensuing
assemblies.
The
relay
photochromic
switch,
keto–enol
equilibrium,
ring–chain
equilibrium
allows
light-mediated
structural
changes.
accompanying
distinct
reactivity
further
enables
dynamic
bonding
release
substrates
bidirectionally
through
alternating
two
wavelengths
light,
essentially
realizing
signaling
cycles.
downfall
energy
by
bond
formation/scission
upon
photochemical
reactions
offers
driving
force
for
controlled
direction
cascade.
To
show
molecular
diversity,
on-demand
assembly/disassembly
polymers,
including
structurally
reconfigurable
was
realized.
This
work
achieves
regulation
architectures
within
which
has
rarely
been
reported
before.
results
resemble
biological
networks
should
set
stage
many
endeavors,
such
as
assemblies,
motors,
responsive
intelligent
materials.
