Amide‐Based Ligands for Anion Coordination

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Abstract
Anion recognition is an active area of research in supramolecular chemistry. The rapidly increasing amount of structural data now allows anion coordination chemistry to be formalized in terms of coordination numbers and geometries based on hydrogen‐bonding interactions between the host (ligand) and the guest (anion). This Minireview targets just one class of anion receptors, namely, amide‐based ligands. The structural data for a series of five anion shapes are compiled according to coordination number, and distinct commonalities are observed within a given anion topology. The results also indicate a number of similarities between the coordination of anions and transition‐metal ions.