Redox-powered autonomous directional C-C bond rotation under enzyme control

Area of Science:

• Chemical Engineering
• Materials Science
• Nanotechnology

Background:

• Biological systems utilize out-of-equilibrium chemical reaction networks for energy conversion and mechanical work.
• Artificial molecular machines have been developed using reaction networks, but are limited to a single reaction type, typically acylation-hydrolysis.
• Existing synthetic systems for continuous molecular motion are scarce and rely on limited reaction classes.

Purpose of the Study:

• To design and demonstrate a synthetic molecular motor capable of continuous, autonomous unidirectional motion.
• To explore the use of a redox reaction network for driving molecular motion.
• To overcome the limitations of single-reaction-type networks in artificial molecular machines.

Main Methods:

• Development of a synthetic molecular motor based on an achiral biphenyl structure.
• Implementation of a redox reaction network with concurrent oxidation and reduction pathways.
• Utilizing an oxidant and reductant as fuels to drive the motor's motion.

Main Results:

• The redox reaction network successfully drove chemically fuelled continuous autonomous unidirectional motion about a C-C bond.
• The motor design is structurally simple and based on an achiral biphenyl.
• The system exploits enantioselectivity and functional separation of reactivity, inspired by enzyme catalysis.

Conclusions:

• A novel redox reaction network can power continuous autonomous molecular motion in synthetic systems.
• This approach broadens the scope of chemical reactions applicable to artificial molecular machines.
• The findings pave the way for more sophisticated and biologically inspired molecular devices.