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Precision Switching and Coupled Motion in a [3]Rotaxane Molecular Machine.

Leonardo Andreoni1,2, Jessica Groppi2,3, Alberto Credi1,2

  • 1Dipartimento di Chimica Industriale "Toso Montanari", Alma Mater Studiorum - Università di Bologna, Bologna, Italy.

Angewandte Chemie (International Ed. in English)
|June 30, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel [3]rotaxane molecular machine with two crown ether rings. Their positions on the axle are precisely controlled, enabling coupled motion for advanced molecular devices.

Keywords:
ammoniumbypiridiniumcrown ethersmolecular machinesrotaxanestriazolium

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Molecular machines are sophisticated systems with moving parts at the nanoscale.
  • Rotaxanes, with their mechanically interlocked structures, are promising platforms for molecular machines.
  • Controlling the precise movement of multiple components is crucial for advanced functionalities.

Purpose of the Study:

  • To synthesize and characterize a multicomponent molecular machine based on a [3]rotaxane architecture.
  • To investigate the precise control over the position of two crown ether macrocycles on a functionalized axle.
  • To understand the coupled motion between the macrocycles for developing sophisticated molecular devices.

Main Methods:

  • Synthesis of a [3]rotaxane architecture featuring two crown ether macrocycles and an axle with three recognition sites (ammonium, bipyridinium, and triazolium).
  • Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy to elucidate structural and dynamic properties.
  • Voltammetric techniques to probe electrochemical inputs and control ring positioning.
  • Thermodynamic analysis of the reaction network governing the molecular machine's behavior.

Main Results:

  • Successful synthesis and characterization of the [3]rotaxane molecular machine.
  • Demonstrated precise control over the location of the two crown ether rings using chemical and electrochemical stimuli.
  • Observed distinct configurations: rings on neighboring stations, forced onto the same station, or separated at opposite ends of the axle.
  • NMR and voltammetry confirmed the coupled motion between the two macrocycles, where the position of one ring influences the other.

Conclusions:

  • The developed [3]rotaxane system represents a sophisticated multicomponent molecular machine with controllable and coupled dynamics.
  • The precise control over macrocycle positioning highlights the potential for designing complex molecular machinery.
  • The observed coupled motion is a critical feature for advancing the design of next-generation molecular machines with tailored functionalities.