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Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
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Strain Energy Induced Rotary Speed Acceleration in a Light-Driven Molecular Motor.

Kai Lan1, Shilong Zhang2, Yi Lu3

  • 1College of Chemistry, Key Laboratory of Green Chemistry and Technology of Ministry of Education, Sichuan University, Chengdu, Sichuan, 610064, China.

Angewandte Chemie (International Ed. in English)
|April 30, 2025
PubMed
Summary

Strain energy from cycloparaphenylenes (CPPs) significantly accelerates light-driven molecular motors. Decreasing macrocycle size enhances this effect, offering a new strategy for motor speed regulation.

Keywords:
CycloparaphenylenesMacrocyclesMolecular machineMolecular motors

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Light-driven molecular motors based on overcrowded alkenes enable unidirectional rotation.
  • Controlling motor speed without structural modification is a significant challenge.

Purpose of the Study:

  • To investigate the effect of strain energy from cycloparaphenylenes (CPPs) on the rotary speed of molecular motors.
  • To develop a strategy for accelerating molecular motor speed using strain energy.

Main Methods:

  • Synthesis of molecular motors incorporated in CPPs of varying sizes.
  • Photochemical and thermal isomerization studies using UV-vis and 1H NMR spectroscopy.
  • Computational analysis using density functional theory (DFT).

Main Results:

  • Rotary speed of molecular motors was significantly enhanced by harnessing CPP strain energy.
  • Acceleration increased with decreasing macrocycle size, reaching up to 389-fold.
  • Strain-induced bending in the stator reduced steric hindrance, explaining the acceleration.

Conclusions:

  • Harnessing strain energy in CPPs is an effective strategy to accelerate molecular motor speed.
  • The size of the CPP macrocycle directly influences the acceleration effect.
  • This approach offers a general method for enhancing molecular motor performance.