Anion recognition as a method for templating pseudorotaxane formation

Proceedings of the National Academy of Sciences of the United States of America
James A WisnerBoosayarat Tomapatanaget

Abstract

Two thread-shaped cations, pyridinium nicotinamide and imidazolium, as their chloride and hexafluorophosphate salts, were studied with regards to complexation with hydrogen-bond-donating acyclic and macrocyclic ligands. In the latter case, the cations form pseudorotaxanes templated by the chloride anion but not hexafluorophosphate. This formation is a function of the coupling of ion-pairing between the cation and chloride anion and subsequent recognition of the anion by the macrocyclic diamide, which provides the driving force for interpenetration. We propose that this anion template principle is a general method for the construction of pseudorotaxanes and could be applied to other cationic threads, anions, and macrocyclic species.

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Citations

Jun 6, 2012·Journal of the American Chemical Society·Ryo SekiyaReiko Kuroda
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