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Related Experiment Videos

Electrochemically switchable hydrogen-bonded molecular shuttles.

Alessio Altieri1, Francesco G Gatti, Euan R Kay

  • 1Dipartimento di Chimica G. Ciamician, Università degli Studi di Bologna, v. F. Selmi 2, 40126, Bologna, Italy.

Journal of the American Chemical Society
|July 10, 2003
PubMed
Summary
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Researchers developed redox-switchable rotaxanes where electrochemistry controls macrocycle binding. This enables precise control over molecular movement, demonstrating reversible shuttling between stations.

Area of Science:

  • Supramolecular Chemistry
  • Molecular Machines
  • Electrochemistry

Background:

  • Rotaxanes are molecular architectures with a macrocycle threaded onto an axle.
  • Hydrogen bonding plays a crucial role in controlling the position of the macrocycle on the axle.
  • Controlling molecular motion is key to developing advanced molecular machines.

Purpose of the Study:

  • To design and synthesize novel [2]rotaxanes with tunable hydrogen-bonding stations.
  • To investigate the electrochemical control of macrocycle binding affinities.
  • To demonstrate redox-induced, reversible shuttling of a macrocycle in a rotaxane.

Main Methods:

  • Synthesis of [2]rotaxanes featuring succinamide and naphthalimide stations.
  • Nuclear Magnetic Resonance (1H NMR) spectroscopy for structural elucidation.

Related Experiment Videos

  • Cyclic voltammetry to study redox processes and macrocycle movement.

    • Main Results:

    • Electrochemical reduction/oxidation of naphthalimide stations modulated hydrogen bonding.
    • Macrocycle binding affinities shifted by over 8 orders of magnitude via redox control.
    • NMR confirmed macrocycle's positional integrity for the succinamide station.
    • Cyclic voltammetry demonstrated reversible and cyclable redox-induced shuttling.
    • Shuttling in THF at room temperature occurred within approximately 50 microseconds.

    Conclusions:

    • Redox processes can precisely control macrocycle positioning in rotaxanes.
    • This provides a mechanism for switchable molecular recognition and motion.
    • The developed rotaxanes function as electrochemically operated molecular switches.