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Related Experiment Videos

Shuttling dynamics in an acid-base-switchable [2]rotaxane.

Sandrine Garaudée1, Serena Silvi, Margherita Venturi

  • 1Dipartimento di Chimica G. Ciamician, Università di Bologna via Selmi 2, 40126 Bologna, Italy.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|October 7, 2005
PubMed
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Molecular shuttles, prototypes of molecular machines, were studied using stopped-flow spectroscopy. The dibenzo[24]crown-8 ether macrocycle

Area of Science:

  • Supramolecular Chemistry
  • Chemical Kinetics
  • Materials Science

Background:

  • Rotaxanes are mechanically interlocked molecules with potential applications in molecular machines.
  • Molecular shuttles, a type of rotaxane, exhibit controlled movement of a macrocycle along a dumbbell component.
  • Understanding the kinetics of macrocycle movement is crucial for designing functional molecular devices.

Purpose of the Study:

  • To investigate the kinetics of a dibenzo[24]crown-8 ether (DB24C8) macrocycle shuttling between ammonium and bipyridinium stations in a [2]rotaxane.
  • To determine the activation parameters governing the shuttling process in both forward and reverse directions.
  • To examine the influence of counterions on the shuttling rates and dynamics.

Main Methods:

Related Experiment Videos

  • Stopped-flow spectroscopic techniques were employed to monitor the shuttling process in acetonitrile solution.
  • Kinetic measurements were performed over a temperature range of 277-303 K.
  • The effects of pH (deprotonation/reprotonation) and counterions on reaction rates were systematically studied.

    • Main Results:

    • The affinity of the DB24C8 macrocycle for the stations followed the order: ammonium > bipyridinium > amine.
    • Shuttling induced by deprotonation (ammonium to bipyridinium) was significantly slower than shuttling induced by reprotonation (amine to ammonium).
    • Counterions were found to significantly contribute to the activation barrier for the shuttling process.

    Conclusions:

    • The dynamics of molecular shuttling are influenced by changes in intercomponent interactions and structural rearrangements.
    • The rates and mechanisms of shuttling are controllable through acid-base chemistry at the recognition sites.
    • Counterion effects are critical and must be considered in the design of rotaxane-based molecular machines.