Artificial Molecular Pump Operating in Response to Electricity and Light

Area of Science:

• Molecular nanotechnology
• Supramolecular chemistry
• Organic chemistry

Background:

• Controlling molecular motion is key for molecular nanotechnology.
• Mechanically interlocked molecules (MIMs) enable artificial molecular machines (AMMs).
• Previous artificial molecular pumps (AMPs) created complex molecules with high precision.

Purpose of the Study:

• To design and synthesize a novel artificial molecular pump (AMP).
• To incorporate a photocleavable stopper for orthogonal stimulus control.
• To demonstrate light-triggered release of molecular components.

Main Methods:

• Utilized a ratchet mechanism to pump a ring onto a collecting chain, forming a [2]rotaxane.
• Employed a photocleavable stopper, triggered by light, for controlled release.
• Monitored the process using fluorescence quenching of a naphthalene-based fluorophore.

Main Results:

• Successfully synthesized and operated an AMP with a photocleavable stopper.
• Demonstrated precise, light-induced release of a pumped ring from a [2]rotaxane.
• Achieved temporal control over molecular motion and release.

Conclusions:

• The developed AMP offers orthogonal control over molecular motion using light.
• This system provides a platform for on-demand molecular transport and fabrication.
• Potential applications include advanced molecular transporting systems.