Selective isolation of Keggin ions using self-assembled superanion capsules †
- 1 January 1999
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 20,p. 3639-3642
- https://doi.org/10.1039/a905436g
Abstract
Crystals of composition [Al13O4(OH)24(H2O)12][Na(18-crown-6)(H2O)2L2(H+)w]0.5 x–[{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.Keywords
This publication has 0 references indexed in Scilit: