A Cyclic Hexapeptide Containing L ‐Proline and 6‐Aminopicolinic Acid Subunits Binds Anions in Water

Abstract
A neutral receptor that binds anions by hydrogen bonds even in water is the cyclopeptide reported in this article. This property results from the particular structure of the complex in which the anions are effectively shielded from the surrounding solvent, as can be seen in the iodide complex shown.