Solvent
Mixing To Induce Molecular Motor Aggregation
into Bowl-Shaped Particles: Underlying Mechanism, Particle Nature,
and Application To Control Motor Behavior
Linda
E. Franken
Yuchen Wei
Jiawen Chen
Egbert J. Boekema
Depeng Zhao
Marc C. A. Stuart
Ben L. Feringa
10.1021/jacs.8b03045.s002
https://acs.figshare.com/articles/media/Solvent_Mixing_To_Induce_Molecular_Motor_Aggregation_into_Bowl-Shaped_Particles_Underlying_Mechanism_Particle_Nature_and_Application_To_Control_Motor_Behavior/6591536
Control
over dynamic functions in larger assemblies is key to many
molecular systems, ranging from responsive materials to molecular
machines. Here we report a molecular motor that forms bowl-shaped
particles in water and how confinement of the molecular motor affects
rotary motion. Studying the aggregation process in a broader context,
we provide evidence that, in the case of bowl-shaped particles, the
structures are not the product of self-assembly, but a direct result
of the mixing a good solvent and a (partial) non-solvent and highly
independent of the molecular design. Under the influence of the non-solvent,
droplets are formed, of which the exterior is hardened due to the
increase in the glass transition temperature by the external medium,
while the interior of the droplets remains plasticized by the solvent,
resulting in the formation of stable bowl-shaped particles with a
fluid interior, a glass-like exterior, and a very specific shape:
dense spheres with a hole in their side. Applying this to a bulky
first-generation molecular motor allowed us to change its isomerization
behavior. Furthermore, the motor shows <i>in situ</i> photo-switchable
aggregation-induced emission. Strong confinement prohibits the thermal
helix inversion step while altering the energy barriers that determine
the rotary motion, such that it introduces a reverse <i>trans</i>–<i>cis</i> isomerization upon heating. These studies
show a remarkable control of forward and backward rotary motion by
simply changing solvent ratios and extent of confinement.
2018-06-07 00:00:00
Particle Nature
non-solvent
Solvent Mixing
helix inversion step
Strong confinement
Control Motor Behavior Control
isomerization behavior
motor
glass transition temperature
Bowl-Shaped Particles
studies show
droplets
energy barriers
photo-switchable aggregation-induced emission
aggregation process
Induce Molecular Motor Aggregation