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Assemblies of Cucurbit[6]uril-Based Coordination Complexes with Disulfonate Ligands: From Discrete Complexes to One- and Two-Dimensional Polymers

Chen, Kai; Hua, Zi-Yi; Li, Ran; Peng, Yu-Ying; Zhu, Zhao qiang; Zhao, Jiang-lin; Redshaw, Carl

Authors

Kai Chen

Zi-Yi Hua

Ran Li

Yu-Ying Peng

Zhao qiang Zhu

Jiang-lin Zhao

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Professor Carl Redshaw C.Redshaw@hull.ac.uk
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry



Abstract

In this work, the combination of cucurbit[6]uril (Q[6]) with varied naphthalene disulfonates and alkaline-earth metal ions allows for successful isolation of 9 novel Q[6]-based coordination complexes with formulas of [Ca(H2O)4(Q[6])0.5(1,5-NDA)0.5]·(1,5-NDA)0.5·3H2O (1), [Sr(H2O)4(Q[6])0.5(1,5-NDA)0.5]·(1,5-NDA)0.5·4H2O (2), [Ba(H2O)4(Q[6])0.5(1,5-NDA)0.5]·(1,5-NDA)0.5·4H2O (3), [Ca(H2O)5(Q[6])0.5](2,6-NDA)·9H2O (4), [Sr(H2O)5(Q[6])0.5]·(2,6-NDA)·6H2O (5), [Ba2(H2O)7(Q[6])(2,6-NDA)2]·11H2O (6), [Sr(H2O)4(Q[6])0.5(2,6-NDA)0.5]·(2,6-NDA)0.5·5H2O (7), [Ca2(H2O)10(Q[6])](2,7-NDA)·14H2O (8) and [Sr(H2O)5(Q[6])(2,7-NDA)]·4H2O (9) (H2NDA = naphthalene disulfonic acid). Structural analysis revealed that the carbonyl groups of Q[6] bind directly to the alkaline-earth metal ions to form 1D coordination chains. Moreover, the metal ions are also linked to the disulfonate substituents of the naphthalenes, which, in the case of 9, resulted in a simple coordination complex, for 6, a 1D Q[6]-NDA-M2+ chain, and in the case of 1 - 3 and 7, 2D networks. By contrast, for 4, 5 and 8, the disulfonate ligands do not bind to the metals, and instead, act as supramolecular linkers. The resultant 3D supramolecular architecture of these compounds were constituted through various noncovalent interactions, particularly involving outer-surface interactions of the Q[6]s. Furthermore, the fluorescent properties of the species 2 and 7 were investigated, and sensing experiments indicated that both were capable of functioning as fluorescent sensors for Fe3+ with high sensitivity and selectivity.

Citation

Chen, K., Hua, Z., Li, R., Peng, Y., Zhu, Z. Q., Zhao, J., & Redshaw, C. (in press). Assemblies of Cucurbit[6]uril-Based Coordination Complexes with Disulfonate Ligands: From Discrete Complexes to One- and Two-Dimensional Polymers. CrystEngComm RSC, https://doi.org/10.1039/d0ce01456g

Journal Article Type Article
Acceptance Date Nov 10, 2020
Online Publication Date Nov 13, 2020
Deposit Date Nov 16, 2020
Publicly Available Date Nov 14, 2021
Journal CrystEngComm
Print ISSN 1466-8033
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1039/d0ce01456g
Keywords General Materials Science; General Chemistry; Condensed Matter Physics
Public URL https://hull-repository.worktribe.com/output/3663353
Publisher URL https://pubs.rsc.org/en/Content/ArticleLanding/2020/CE/D0CE01456G#!divAbstract
Additional Information : This document is Similarity Check deposited; : Supplementary Information; : Single-blind; : Received 5 October 2020; Accepted 10 November 2020; Accepted Manuscript published 13 November 2020