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Large anion binding in water.

Khaleel I Assaf1,2, Werner M Nau1

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|August 7, 2023
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Summary
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Large, water-soluble anions exhibit strong binding with macrocyclic hosts due to the chaotropic effect, a powerful force in aqueous supramolecular chemistry. This interaction drives novel applications in molecular recognition and beyond.

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Area of Science:

  • Supramolecular Chemistry
  • Physical Chemistry
  • Chemical Biology

Background:

  • Large, water-soluble anions with chaotropic properties show significant interactions with hydrophobic environments.
  • The chaotropic effect, a key driving force, is often underestimated in aqueous systems.
  • These anions interact with macrocyclic receptors, polymers, biomembranes, and interfaces.

Purpose of the Study:

  • To review the binding of large anions with water-soluble macrocyclic hosts.
  • To highlight the role of the chaotropic effect in these interactions.
  • To showcase new applications driven by high-affinity anion binding.

Main Methods:

  • Literature review of supramolecular interactions.
  • Analysis of binding affinities between anions and macrocyclic receptors.
  • Discussion of the chaotropic effect's contribution.

Main Results:

  • Large anions with chaotropic character bind strongly to macrocyclic hosts in water.
  • The chaotropic effect is a significant, often underestimated, driving force.
  • High affinity binding has led to diverse new applications.

Conclusions:

  • The chaotropic effect significantly enhances the binding of large anions to macrocyclic receptors in water.
  • Understanding this effect opens avenues for designing novel host-guest systems.
  • Applications range from molecular recognition to advanced materials.