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Anion binding to monotopic and ditopic macrocyclic amides.

Ivan V Korendovych1, Mimi Cho, Phillip L Butler

  • 1Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, USA.

Organic Letters
|July 14, 2006
PubMed
Summary

A minimum 15-membered macrocyclic ring is essential for effective fluoride anion recognition. Larger macrocycles, synthesized via [2+2] cyclization, can bind dicarboxylic acid salts, with binding topicity effects also explored.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Analytical Chemistry

Background:

  • Macrocyclic compounds are crucial in host-guest chemistry for selective ion binding.
  • Understanding the size and structural requirements for anion recognition is key to designing new sensors and separation agents.

Purpose of the Study:

  • To investigate the influence of macrocyclic ring size on the binding affinity and selectivity for fluoride anions and dicarboxylic acid salts.
  • To explore the structural factors governing the recognition of different anionic guests by macrocyclic hosts.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was employed to study guest-host interactions.
  • Experiments were conducted in DMSO-d6 solvent to analyze binding events.
  • Synthesis of macrocyclic compounds of varying sizes, including those from [2+2] cyclization, was performed.

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Main Results:

  • A minimum macrocyclic ring size of 15 members was determined to be necessary for successful fluoride anion binding.
  • Larger macrocycles, specifically those resulting from [2+2] cyclization, demonstrated the ability to bind dicarboxylic acid salts.
  • The study also discussed the impact of binding topicity on the observed interactions.

Conclusions:

  • Macrocyclic ring size is a critical determinant for the selective recognition of small anions like fluoride.
  • Larger macrocyclic structures offer versatility in binding different types of anions, including dicarboxylates.
  • The findings contribute to the rational design of macrocyclic hosts for specific anion targets.