Supramolecular assemblies constructed from inverted cucurbit[7]uril and lanthanide cations: synthesis, structure and sorption properties†
Abstract
The interaction of a series of lanthanide cations (Ln3+) with inverted cucurbit[7]uril (iQ[7]) in the presence of [ZnCl4]2− anions as a structure-directing agent have been investigated. Single-crystal X-ray diffraction analysis has revealed that the [ZnCl4]2− anions surround the iQ[7] molecules via the outer surface interactions of iQ[7]. This results in the formation of honeycomb-like frameworks, and ultimately linear supramolecular chains of iQ[7] in which Ln3+ cations occupy voids within the framework. Moreover, these iQ[7]/Ln3+-based supramolecular assemblies exhibit excellent thermal stability as well as permanent porosity, and in one case screening revealed a high CH3OH uptake capacity compared with other porous organic materials assembled solely through hydrogen bonding under ambient conditions.
![Graphical abstract: Supramolecular assemblies constructed from inverted cucurbit[7]uril and lanthanide cations: synthesis, structure and sorption properties](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C6RA15559F&imageInfo.ImageIdentifier.Year=2016)
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