A Calix[4]imidazolium[2]pyridine as an Anion Receptor

Abstract

An effective macrocyclic ionophore for F− ions that contains an array of positively charged imidazolium units has been prepared. The calix[4]imidazolium[2]pyridine cation formed a complex with F− ions in a 1:1 stoichiometry, as shown by binding studies using 1H NMR spectroscopic analysis, X-ray crystallographic determination (see structure), and density functional calculations.