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Functionally rigid bistable [2]rotaxanes.

Sune Nygaard1, Ken C-F Leung, Ivan Aprahamian

  • 1Department of Physics and Chemistry, University of Southern Denmark (Odense University), Campusvej 55, DK-5230, Odense M, Denmark.

Journal of the American Chemical Society
|January 25, 2007
PubMed
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New [2]rotaxanes with rigid spacers simplify molecular switching. Monopyrrolotetrathiafulvalene (MPTTF) stations improve control and reduce isomerization, enabling precise control over the cyclobis(paraquat-p-phenylene) (CBPQT4+) ring movement for advanced molecular switches.

Area of Science:

  • Supramolecular Chemistry
  • Molecular Machines
  • Organic Synthesis

Background:

  • Bistable [2]rotaxanes are molecular switches with controllable components.
  • Previous designs with flexible spacers exhibited complex switching behaviors and isomerization.
  • Donor-acceptor recognition motifs in early molecular switches led to structural complexities.

Purpose of the Study:

  • To synthesize and characterize two-station [2]rotaxanes with rigid spacers.
  • To simplify molecular structure and switching function compared to previous flexible-spacer systems.
  • To investigate the effect of rigid spacers on the control and efficiency of molecular switching.

Main Methods:

  • Synthesis of naphthalene (NP) and monopyrrolotetrathiafulvalene (MPTTF)/NP based [2]rotaxanes.

Related Experiment Videos

  • Characterization in solution using NMR spectroscopy (1H NMR, dynamic 1H NMR) and cyclic voltammetry.
  • Investigation of the ring component's position and movement using chemical and electrochemical triggers.

    • Main Results:

    • Successfully synthesized and characterized degenerate NP/NP and nondegenerate MPTTF/NP [2]rotaxanes with rigid spacers.
    • The MPTTF-NP switch exhibited near isomer-free bistable behavior, eliminating cis/trans isomerization.
    • A single translational isomer was observed over a wide temperature range, with the CBPQT4+ ring predominantly on the MPTTF unit.
    • Rigid spacers facilitated unambiguous control over the CBPQT4+ ring's position and movement (1.5 nm distance).
    • The NP/NP [2]rotaxane showed a lower shuttling barrier (1.0 nm movement) compared to previous systems due to reduced favorable interactions and unimpeded paths.

    Conclusions:

    • Rigid spacers significantly enhance control and simplify the function of bistable [2]rotaxanes.
    • The use of MPTTF stations effectively eliminates isomerization, leading to more predictable molecular switching.
    • These findings pave the way for developing well-defined molecular switches with improved performance and reduced structural complexity.