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Published on: August 19, 2013

Fluoride ion recognition by chelating and cationic boranes.

Todd W Hudnall1, Ching-Wen Chiu, François P Gabbaï

  • 1Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA.

Accounts of Chemical Research
|January 15, 2009
PubMed
Summary

Researchers developed new boron-based receptors for selective fluoride detection. These advanced compounds effectively bind fluoride ions in water, overcoming previous limitations for practical applications.

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Area of Science:

  • * Supramolecular Chemistry
  • * Anion Recognition
  • * Materials Science

Background:

  • * Fluoride ions are ubiquitous in drinking water, toothpaste, and pharmaceuticals, necessitating selective detection methods.
  • * Fluoride detection is crucial for environmental monitoring, uranium enrichment analysis, and chemical warfare agent identification.
  • * The high hydration enthalpy of fluoride makes it a challenging target for anion recognition.

Purpose of the Study:

  • * To design and synthesize novel boron-based receptors for selective fluoride anion detection.
  • * To overcome the limitations of existing receptors, particularly their incompatibility with aqueous media.
  • * To enhance fluoride-binding affinities through cooperative effects and cationic interactions.

Main Methods:

  • * Synthesis and investigation of bifunctional boranes (e.g., 1,8-diborylnaphthalenes) for chelation of fluoride.
  • * Development of triarylboranes functionalized with cationic ammonium or phosphonium groups to enhance water compatibility.
  • * Exploration of cationic boranes to leverage Coulombic and chelate effects for increased fluoride affinity.

Main Results:

  • * Bifunctional boranes showed significantly higher fluoride binding constants but were limited to organic solvents.
  • * Cationically functionalized triarylboranes demonstrated effective fluoride complexation in aqueous media.
  • * Combined Coulombic and chelate effects in cationic boranes substantially boosted fluoride anion affinity.

Conclusions:

  • * Cationic functionalization of boron-based receptors is a viable strategy for achieving high fluoride affinity in aqueous solutions.
  • * The developed boron compounds offer tunable photophysical and electrochemical properties for signaling fluoride binding events.
  • * This approach holds promise for the development of sensors for fluoride and potentially other anions like cyanide.