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Updated: Oct 17, 2025

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Light-controlled micron-scale molecular motion.

Mario Samperi1,2,3, Bilel Bdiri2, Charlotte D Sleet2

  • 1School of Pharmacy, University of Nottingham, Nottingham, United Kingdom.

Nature Chemistry
|October 12, 2021
PubMed
Summary

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This summary is machine-generated.

Researchers developed a light-activated supramolecular system where anionic porphyrin molecules travel along self-assembled bis-imidazolium gel fibers. This breakthrough enables precise control over molecular motion for potential artificial traveler applications.

Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Nature utilizes micron-scale biomolecule movement along supramolecular pathways, driven by stimulus-responsive interactions.
  • Existing responsive microscopic systems show molecular motion but lack precise positional tracking of moving components.

Purpose of the Study:

  • To create a purely supramolecular system for controlled molecular movement along self-assembled fibers.
  • To demonstrate light-induced motion of a molecular 'traveller' along a supramolecular 'path' over several microns.

Main Methods:

  • Development of a bis-imidazolium gel system forming self-assembled fibers.
  • Utilizing visible light irradiation as a stimulus to induce molecular motion.
  • Real-time imaging of molecular movement in the solvated state using total internal reflection fluorescence microscopy.

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Main Results:

  • Anionic porphyrin molecules were observed to move along bis-imidazolium gel fibers upon visible light irradiation.
  • The system demonstrated micron-scale movement of the molecular traveler.
  • Solvent composition was found to influence fiber mechanics, restructuring, and microtoroid formation, controlling motion.

Conclusions:

  • A novel light-responsive supramolecular system was successfully developed, enabling controlled directional movement of molecular travelers.
  • The study highlights the potential for controlling motion via fiber mechanics and solvent interactions.
  • This research lays the foundation for developing artificial travelers with potential catalytic and functional capabilities.