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

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.

Citation

Li, Q., Qiu, S., Zhang, Y., Xue, S., Tao, Z., Prior, T. J., …Xiao, X. (in press). Supramolecular assemblies constructed from inverted cucurbit[7]uril and lanthanide cations: synthesis, structure and sorption properties. RSC advances, 6(81), 77805-77810. https://doi.org/10.1039/c6ra15559f

• Acceptance Date: Aug 6, 2016
• Online Publication Date: Aug 8, 2016
• Deposit Date: Aug 15, 2016
• Publicly Available Date: Feb 13, 2018
• 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
• Public URL: https://hull-repository.worktribe.com/output/442218
• Publisher URL: http://pubs.rsc.org/en/content/articlelanding/2016/ra/c6ra15559f#!divAbstract
• Additional Information: : This document is Similarity Check deposited; CrossRef DOI Link to Correction:: https://doi.org/10.1039/C6RA90081J; : Supplementary Information; : Crystal Structure Data; : The Royal Society of Chemistry has an exclusive publication licence for this journal; OPEN ACCESS: The accepted version of this article will be made freely available after a 12 month embargo period; : Single-blind; : Received 15 June 2016; Accepted 6 August 2016; Accepted Manuscript published 8 August 2016; Version of Record published 16 August 2016