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Related Experiment Videos

Switchable dual binding mode molecular shuttle.

David A Leigh1, Andrew R Thomson

  • 1University of Edinburgh, School of Chemistry, The King's Buildings, West Mains Road, Edinburgh EH9 3JJ, UK. david.leigh@ed.ac.uk

Organic Letters
|November 3, 2006
PubMed
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Protonation state dictates macrocycle positioning within a [2]rotaxane molecule. Hydrogen bonds govern the neutral state, while cation interactions drive position changes upon protonation.

Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Chemical Engineering

Background:

  • Rotaxanes are mechanically interlocked molecules with potential applications in molecular machines.
  • The precise control over the position of components within rotaxanes is crucial for their function.
  • Understanding non-covalent interactions is key to designing responsive molecular systems.

Purpose of the Study:

  • To investigate the influence of protonation on the binding modes and location of a macrocycle within a [2]rotaxane.
  • To elucidate the specific non-covalent interactions responsible for controlling macrocycle positioning.
  • To demonstrate a switchable system based on protonation state.

Main Methods:

  • Synthesis of a [2]rotaxane featuring a macrocycle and a functionalized thread.

Related Experiment Videos

  • Spectroscopic techniques (e.g., NMR) to analyze molecular structure and interactions.
  • Computational modeling to support experimental observations of binding modes.

    • Main Results:

    • The macrocycle exhibits dual binding modes within the [2]rotaxane.
    • In the neutral state, amide-amide hydrogen bonds anchor the macrocycle to a dipeptide residue.
    • Upon protonation of the thread, polyether-ammonium cation interactions become dominant, leading to a positional shift of the macrocycle.

    Conclusions:

    • Protonation serves as an effective trigger to control the location of the macrocycle in the [2]rotaxane.
    • The study highlights the dynamic nature of supramolecular interactions in response to external stimuli.
    • This work provides a foundation for developing switchable molecular architectures.