A Tridentate Halogen-Bonding Receptor for Tight Binding of Halide Anions

摘要

The selective recognition of anions by synthetic receptors is a problem that continues to fascinate chemists. Hydrogen bonding has been the most frequently employed noncovalent interaction for the design of such receptors: molecular scaffolds that place H-bond donor groups in geometries suitable for an anion of interest demonstrate remarkable levels of selectivity and affinity. Nonetheless, anion receptors that rely upon other noncovalent forces, including Lewis acid-base and anion-π interactions, have been investigated, with considerable success. Such studies have provided insight into the interactions employed, and have offered new opportunities to achieve selectivity in anion recognition.