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Polymers 2013, 5(2), 418-430; doi:10.3390/polym5020418
Article

One-Dimensional Coordination Polymers of Lanthanide Cations to Cucurbit[7]uril Built Using a Range of Tetrachloride Transition-Metal Dianion Structure Inducers

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1 Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China 2 College of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China 3 School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane St Lucia, QLD 4072, Australia 4 Commonwealth Scientific and Industrial Research Organisation, Materials Science and Engineering, P.O. Box 218, Lindfield, NSW 2070, Australia
* Authors to whom correspondence should be addressed.
Received: 18 March 2013 / Revised: 30 April 2013 / Accepted: 3 May 2013 / Published: 16 May 2013
(This article belongs to the Special Issue Supramolecular Chemistry and Self-Assembly)
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Abstract

A number of linear coordination polymers have been assembled from lanthanide cations (Ln3+) and cucurbit[7]uril (Q[7]) in the presence of [CuCl4]2−or [CoCl4]2− anions acting as inorganic structure inducers in HCl solution. X-ray diffraction analysis has revealed that they form three groups of isomorphous structures. Generally, the complexes of Q[7] with light lanthanide cations (those with atomic number below that of neodymium (Nd3+)) are in one group. The other two groups, in which the lanthanide cation has atomic number greater than that of europium (Eu3+), seem to follow no obvious rule. For example, the complexes of Q[7] with Eu3+ and Gd3+cations are in the second group in the presence of [CuCl4]2− anions, while they are in the third group in the presence of [CoCl4]2− anions. However, whatever group a given complex belongs to, they all show a common honeycomb-patterned supramolecular assembly, in which [CuCl4]2−or [CoCl4]2− anions form a honeycomb structure. The Ln3+ cations then coordinate to neighboring Q[7] molecules to form 1D coordination polymers that are inserted into the channels of the honeycomb framework, such that each individual coordination polymer is surrounded by [CuCl4]2−or [CoCl4]2− anions.
Keywords: cucurbit[7]uril; lanthanide cation; inorganic inducers; 1D coordination polymers cucurbit[7]uril; lanthanide cation; inorganic inducers; 1D coordination polymers
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Liang, L.-L.; Zhao, Y.; Chen, K.; Xiao, X.; Clegg, J.K.; Zhang, Y.-Q.; Tao, Z.; Xue, S.-F.; Zhu, Q.-J.; Wei, G. One-Dimensional Coordination Polymers of Lanthanide Cations to Cucurbit[7]uril Built Using a Range of Tetrachloride Transition-Metal Dianion Structure Inducers. Polymers 2013, 5, 418-430.

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