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Updated: Sep 22, 2025

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Light-Driven Molecular Whirligig.

Chuan Gao1, Andreas Vargas Jentzsch1, Emilie Moulin1

  • 1SAMS Research Group, Université de Strasbourg, CNRS, Institut Charles Sadron UPR 22, 67000 Strasbourg, France.

Journal of the American Chemical Society
|May 23, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a light-driven molecular motor that stores energy through polymer chain twisting, enabling reverse rotation. This molecular motor also exhibits a 500% fluorescence increase when mechanically constrained.

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Area of Science:

  • Molecular Machines
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Molecular motors are crucial for nanoscale applications.
  • Controlling molecular motion and energy storage is a key challenge.

Purpose of the Study:

  • To design and investigate a light-driven rotary motor integrated into a figure-of-eight molecular structure.
  • To explore energy storage and release mechanisms via polymer chain conformation.
  • To quantify the work, torque, and force generated by the molecular motor.

Main Methods:

  • Constructing a figure-of-eight molecule with a light-driven rotary motor and polymer linkers.
  • Utilizing UV light to induce clockwise rotation and conformational strain.
  • Analyzing the stored energy and reverse rotation dynamics.
  • Measuring fluorescence changes under mechanical constraint.
  • Calculating activation energies to determine work output.

Main Results:

  • The molecular motor demonstrated light-induced rotation and stored energy through polymer chain twisting.
  • The tensed conformation was sufficient to trigger reverse rotation, mimicking a macroscopic whirligig.
  • A 500% increase in fluorescence emission was observed in the strained state due to mechanical constraints.
  • Quantitative estimates of work, torque, and force generated by the motor were successfully extracted.

Conclusions:

  • A novel molecular device capable of light-driven rotary motion, energy storage, and controlled release has been developed.
  • The study provides a quantitative understanding of the mechanical work performed by molecular motors.
  • This research addresses a long-standing question regarding the torque and force generated by such systems.