Calix[4]pyrrole:An Old yet New Ion-Pair Receptor

摘要

The development of ion-pair receptors,with the goal of achieving a higher level of control over recognition than that obtainable from simple ion binding,has intrigued researchers in supramolecular chemistry over the past decade.Many reports have appeared during this period that describe the synthesis and study of very sophisticated receptor designs incorporating a range of electron-pair donor and acceptor groups.Most,if not all,of this work has been performed in the context of creating so-called ion-pair or salt hosts that will bind cation-anion pairs in homogeneous solution or enhance their extraction or transport under interfacial conditions.