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High-affinity anion binding by steroidal squaramide receptors.

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Angewandte Chemie (International Ed. in English)
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Summary

New steroid-based squaramide receptors exhibit exceptionally high anion binding affinities, exceeding 10^14 M^-1. However, their effectiveness as transmembrane carriers suggests an optimal binding strength is crucial for efficient anion transport.

Keywords:
anionsionophoresmembranesmolecular recognitionsupramolecular chemistry

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Chemical Biology

Background:

  • Development of synthetic receptors for anion recognition is crucial for various chemical and biological applications.
  • Existing receptors based on ureas and thioureas have limitations in binding affinity and solubility.
  • Steroidal frameworks offer a unique platform for preorganizing functional groups for enhanced molecular interactions.

Purpose of the Study:

  • To design and synthesize novel, highly potent anion receptors.
  • To investigate the structure-affinity relationships of squaramide-based receptors.
  • To evaluate the performance of these receptors as transmembrane anion carriers.

Main Methods:

  • Synthesis of steroidal scaffolds functionalized with squaramide units.
  • Determination of binding constants using a modified Cram's extraction procedure in chloroform.
  • Assessment of transmembrane anion transport in unilamellar vesicles.

Main Results:

  • Exceptionally high binding constants (exceeding 10^14 M^-1) were measured for tetraethylammonium salts.
  • The steroidal framework effectively preorganizes squaramide groups for cooperative anion binding.
  • Anion receptor activity as carriers did not correlate directly with binding affinities, indicating a potential upper limit.

Conclusions:

  • Steroidal squaramide receptors represent a new class of powerful anion binders.
  • The preorganization strategy enhances binding affinity in nonpolar media.
  • For transmembrane anion transport, receptor design must balance binding strength with carrier efficiency.