Strong and Selective Anion Binding within the Central Cavity of Molecular Knots and Links.

Research output: Contribution to journalArticle

  • External authors:
  • Jean-François Ayme
  • Jonathon E Beves
  • Christopher J Campbell
  • Guzman Gil-Ramirez
  • Alexander J Stephens


A molecular pentafoil knot and doubly and triply entwined [2]catenanes based on circular Fe(II) double helicate scaffolds bind halide anions in their central cavities through electrostatic and CH···X(-) hydrogen-bonding interactions. The binding is up to (3.6 ± 0.2) × 10(10) M(-1) in acetonitrile (for pentafoil knot [2·Cl](PF6)9), making these topologically complex host molecules some of the strongest synthetic noncovalent binders of halide anions measured to date, comparable in chloride ion affinity to silver salts.

Bibliographical metadata

Original languageEnglish
Pages (from-to)9812-9815
Number of pages3
JournalJournal of the American Chemical Society
Issue number31
StatePublished - 12 Aug 2015