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DOI: 10.1039/A905436G (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 3639-3642

Selective isolation of Keggin ions using self-assembled superanion capsules[hair space]†

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Alexander Drljaca, Michaele J. Hardie and Colin L. Raston

Abstract

Crystals of composition [Al13O4(OH)24(H2O)12][Na(18-crown-6)(H2O)2L2(H+)w]0.5x–[{L(H+)y}]z–·29H2O 1, where x + z = 7 and L = p-sulfonatocalix[4]arene, were obtained from an aqueous solution containing monomeric and oligomeric aluminium species, Na4L and 18-crown-6. The crystal structure features three distinct elements: the cationic Keggin ion [Al13O4(OH)24(H2O)12]7+, an anionic capsule [Na(18-crown-6)(H2O)2L2(H+)w]x– and a water bearing calixarene. The anionic capsule comprises a central sodium ion bound by 18-crown-6 and two trans water molecules, which is in turn encapsulated by two p-sulfonatocalix[4]arene molecules in a head-to-head arrangement. The different components are held together in the solid state by an intricate pattern of hydrogen bonds, complemented by other supramolecular interactions such as π–π stacking.

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