A Study on the Coordination of Fully Substituted Cyclopentano Cucurbit[5, 6]uril with Copper and Zinc Ions

Herein, we report the supramolecular self‐assembly of fully substituted cyclopentano cucurbit[5]uril (CyP 5 Q[5]) and cucurbit[6]uril (CyP 6 Q[6]) with Cu(ClO 4 ) 2 and Zn(ClO 4 ) 2 in a solution of formic acid. Single crystal X‐ray diffraction analysis showed that CyP 5 Q[5]‐Cu(ClO 4 ) 2 forms a W‐type molecular capsule complex and CyP 5 Q[5]‐Zn(ClO 4 ) 2 forms alternate Z‐type and V‐type molecular capsule complexes. Both CyP 6 Q[6]‐Cu(ClO 4 ) 2 and CyP 6 Q[6]‐Zn(ClO 4 ) 2 form Z‐type molecular capsule complexes. These two coordination systems have the same unit cell parameters and are isomorphic complexes. In these four systems the ClO 4 – ions are coordinated around the cucurbituril via ion‐dipole interactions and induce the self‐assembly of the cucurbituril and metal ions.