Coordination of Pentacyclohexanocucurbit[5]uril with Alkali Metal Ions and Supramolecular Self‐Assembly in the Absence and Presence of Inorganic Anions

The coordination of pentacyclohexanocucurbit[5]uril (PCyHQ[5]) to alkali metal cations and the formation of supramolecular assemblies in the absence and presence of [CdCl 4 ] 2– or [ZnCl 4 ] 2– anions as inorganic structure inducers have been investigated by single‐crystal X‐ray diffraction analysis. Studies of the crystal structures have revealed that the [CdCl 4 ] 2– or [ZnCl 4 ] 2– anions do not form honeycomb structures owing to the presence of alkyl substituents on the surface of the outer walls of PCyHQ[5], which can seriously perturb the interaction of the anions with the outer walls. Moreover, in the presence of [ZnCl 4 ] 2– anions, the formation of a new Rb‐PCyHQ[5]‐based 2D six‐membered “bracelet” network suggests that larger ions such as Ba 2+ and even Ra 2+ could form this new type of supramolecular assembly.