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

• Published in: ChemistrySelect (Weinheim) 2019-10, Vol.4 (40), p.11674-11677
• Main Authors: Zhao, Wei Wei, Wei, Lian Tong, Zhou, Kai Zhi, Chen, Ming Hua, Cheng, Si Yuan, Jiang, Dao Fa, Ma, Pei Hua
• Format: Article
• Language: English
• Subjects: Copper perchlorate; Cyclopentano cucurbit[5, 6]uril; Macrocyclic ligands; X-ray diffraction; Zinc perchlorate
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.201902978

Herein, we report the supramolecular self‐assembly of fully substituted cyclopentano cucurbit[5]uril (CyP5Q[5]) and cucurbit[6]uril (CyP6Q[6]) with Cu(ClO4)2 and Zn(ClO4)2 in a solution of formic acid. Single crystal X‐ray diffraction analysis showed that CyP5Q[5]‐Cu(ClO4)2 forms a W‐type molecular capsule complex and CyP5Q[5]‐Zn(ClO4)2 forms alternate Z‐type and V‐type molecular capsule complexes. Both CyP6Q[6]‐Cu(ClO4)2 and CyP6Q[6]‐Zn(ClO4)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 ClO4– ions are coordinated around the cucurbituril via ion‐dipole interactions and induce the self‐assembly of the cucurbituril and metal ions. The paper reports the supramolecular self‐assembly of CyP5Q[5] and CyP6Q[6] with Cu(ClO4)2 and Zn(ClO4)2 in a solution of formic acid. Single crystal X‐ray diffraction analysis showed that the ions have different coordination modes when coordinating with CyP5Q[5], while having the same coordination mode when colocalized with CyP6Q[6].