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Supramolecular assemblies constructed from inverted cucurbit[7]uril and lanthanide cations: synthesis, structure and sorption properties

Li, Qing; Qiu, Sheng-Chao; Zhang, Yun-Qian; Xue, Sai-Feng; Tao, Zhu; Prior, Timothy J.; Redshaw, Carl; Zhu, Qian-Jiang; Xiao, Xin

Authors

Qing Li

Sheng-Chao Qiu

Zhu Tao

Xin Xiao

Sai-Feng Xue

Yun-Qian Zhang

Qian-Jiang Zhu

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.

Journal Article Type Article
Journal RSC advances
Print ISSN 2046-2069
Electronic ISSN 2046-2069
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 6
Issue 81
Pages 77805-77810
DOI https://doi.org/10.1039/c6ra15559f
Keywords General Chemistry; General Chemical Engineering
Publisher URL http://pubs.rsc.org/en/content/articlelanding/2016/ra/c6ra15559f#!divAbstract

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