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Related Experiment Videos

Guest binding and orientation within open nanoscale hosts.

Zachary R Laughrey1, Corinne L D Gibb, Tangi Senechal

  • 1Department of Chemistry, University of New Orleans, New Orleans, LA 70148, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 31, 2002
PubMed
Summary

Researchers synthesized nanoscale molecular hosts (cavitands) with wide portals. Halogenated guests showed strong binding via C-H hydrogen bonds, with binding influenced by guest size and solvent.

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Area of Science:

  • Supramolecular Chemistry
  • Nanotechnology
  • Organic Chemistry

Background:

  • Development of nanoscale molecular hosts is crucial for molecular recognition.
  • Cavitands offer preorganized cavities for guest encapsulation.
  • Functionalization of cavitands can tune binding properties.

Purpose of the Study:

  • Synthesize novel nanoscale molecular hosts (cavitands).
  • Investigate guest binding affinities and complexation dynamics.
  • Determine guest orientation and driving forces for binding.

Main Methods:

  • Synthesis of three distinct nanoscale cavitand hosts.
  • Complexation studies with 31 diverse guest molecules.
  • Nuclear Magnetic Resonance (NMR) spectroscopy (EXSY and 1H NMR) for orientation and exchange studies.

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  • Van't Hoff analysis for thermodynamic characterization.

    • Main Results:

    • Hosts possess wide (1 nm) portals and deep-functionalized benzal C-H groups.
    • Halogenated guests exhibited strongest binding, indicative of C-H···X-R hydrogen bonds.
    • Binding affinity and guest exchange rates depend on guest size, solvent (DMSO favored stronger binding), and complementarity.
    • Guest orientation is governed by interactions with benzal groups and solvent polarity.
    • Complexations were entropically unfavorable, with C-H···I-R hydrogen bonds contributing 1-1.5 kcal mol(-1).

    Conclusions:

    • Novel nanoscale cavitands effectively bind diverse guests.
    • Polydentate C-H···X-R hydrogen bonds are key interactions for strong binding.
    • Solvent and guest complementarity significantly influence binding kinetics and thermodynamics.
    • Understanding these interactions provides insights for designing advanced host-guest systems.