Solid-state evidence for alkali metal to arene Pi-complexation

<p>We report a variety of alkali metal cation-π interactions, documented by X-ray crystallography. These include interactions with the neutral arenes benzene, phenol, and indole. We also include structural results for lithium, sodium, potassium, rubidium, and cesium cation-π complexes in which the arene has enhanced electron richness owing to an adjacent or integral charge.</p>