Ion pair-induced conformational motion in calix[4]arene-strapped calix[4]pyrroles.

ABSTRACT: In order to understand the still-poorly understood interplay between calix[4]arene conformations and cation and anion recognition in multicomponent systems, the ion pair receptors 1 and 2 were synthesized. In solution and in the solid state, the calix[4]arene subunit of receptor 1 adopts a cone conformation, while that of 2 interconverts between the cone and the partial cone conformation. These geometric features differ from previous systems where the calix[4]arene moiety was locked in the 1,3-alternate conformation. A combination of ¹H NMR spectroscopic analyses and single crystal X-ray diffraction studies reveal that receptor 1 binds the fluoride and the chloride anion via significantly different binding modes, displaying, for instance

SUBMITTER: Kim SK 

PROVIDER: S-EPMC5811093 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature