Cesium Halide Ion Pair Recognition by a Pyrrole Strapped Calix[4]pyrrole.

ABSTRACT: The binding properties of the pyrrole-strapped calix[4]pyrrole 2 for cesium halide ion pairs were studied via ¹H NMR spectroscopic and single crystal X-ray diffraction analyses. Receptor 2 was found to bind CsF, CsCl, and CsBr in the solid state and in chloroform/methanol (4/1, v/v) solution with relatively high affinity as compared with the parent calix[4]pyrrole 1. It was also revealed by solid-liquid extraction experiments that receptor 2 was capable of solubilizing CsF in CDCl₃, a medium in which this salt is otherwise insoluble. Single crystal X-ray diffraction analyses and ¹H NMR spectroscopic data recorded in 20% CD₃OD in CDCl₃ provide support for the suggestion that the strap pyrrolic NH proto

SUBMITTER: Yang JH 

PROVIDER: S-EPMC7286541 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature