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Resorcinarenes are hexameric capsules in solution.

Tamar Evan-Salem1, Inbal Baruch, Liat Avram

  • 1The Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 9, 2006
PubMed
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Resorcinarene capsules self-assemble to encapsulate small molecules like glutaric acid. This host-guest complexation creates an asymmetric magnetic environment, revealing reversible encapsulation may be a century-old phenomenon.

Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Analytical Chemistry

Background:

  • Resorcin[4]arenes are known for their ability to form self-assembled structures.
  • Host-guest complexation is a key area in supramolecular chemistry, with applications in molecular recognition and encapsulation.
  • Understanding the dynamics and structural properties of these complexes is crucial for designing new functional materials.

Purpose of the Study:

  • To investigate the host-guest complexes formed between resorcin[4]arenes and small molecules in organic solutions.
  • To elucidate the self-assembly structure and the nature of the encapsulation using advanced NMR techniques.
  • To explore the implications of these findings on the historical understanding of reversible encapsulation.

Main Methods:

Related Experiment Videos

  • Nuclear Magnetic Resonance (NMR) spectroscopy, including 2D COSY, 2D NOESY, 1D NOE, and diffusion-ordered NMR spectroscopy (DOSY).
  • Characterization of host-guest complexes in chloroform solution.
  • Analysis of proton signals and magnetic environments within the complex.

    • Main Results:

    • Resorcin[4]arenes self-assemble into a capsule structure, with six resorcinarene units forming the capsule.
    • The capsule encapsulates either six molecules of glutaric acid or three molecules of beta-methyl d-glucopyranoside.
    • The encapsulated guest molecules experience an asymmetric magnetic environment on the proton NMR timescale.

    Conclusions:

    • The study confirms the formation of well-defined resorcinarene capsules capable of encapsulating small organic molecules.
    • The observed asymmetric magnetic environment provides insights into the precise orientation and dynamics of guest molecules within the capsule.
    • The findings suggest that reversible encapsulation, as demonstrated here, is a phenomenon with a long history in chemistry, potentially dating back a century.