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Anion recognition by neutral macrocyclic amides.

Michał J Chmielewski1, Janusz Jurczak

  • 1Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 30, 2005
PubMed
Summary

Macrocyclic tetraamide receptor size significantly impacts anion binding strength and selectivity. The 20-membered receptor 2 shows optimal performance, balancing flexibility and preorganization for effective anion recognition.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Chemical Sensing

Background:

  • Amide groups are crucial in natural and synthetic anion receptors.
  • Limited studies exist on structure-affinity relationships in amide-based macrocyclic receptors.

Purpose of the Study:

  • To investigate how macroring size influences anion binding strength and selectivity in uncharged, amide-based receptors.
  • To synthesize and characterize a series of macrocyclic tetraamides with varying ring sizes.

Main Methods:

  • Synthesis of macrocyclic tetraamides from 2,6-pyridinedicarboxylic acid and aliphatic diamines.
  • X-ray crystallography to determine solid-state structures.
  • 1H NMR titrations in DMSO to evaluate anion binding affinities.

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Main Results:

  • Ligands adopt expanded conformations with convergent hydrogen-bond donors in the solid state.
  • Ring size significantly affects anion complex stability; the 20-membered receptor 2 is superior.
  • Receptor 2 exhibits high affinity for chloride anions, demonstrating geometric complementarity.
  • Anion binding is governed by a balance between guest adaptability and preorganization.

Conclusions:

  • The 20-membered macrocyclic tetraamide 2 represents a promising lead structure for anion receptor development.
  • A substantial macrocyclic effect was observed, attributed to the acyclic analogue's poor preorganization.