Selective isolation of Keggin ions using self-assembled superanion capsules

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

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)3639-3642
Number of pages4
JournalJournal of the Chemical Society - Dalton Transactions
Issue number20
Publication statusPublished - 21 Oct 1999
Externally publishedYes


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