Selective isolation of Keggin ions using self-assembled superanion capsules

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

doi:10.1039/a905436g

Selective isolation of Keggin ions using self-assembled superanion capsules

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

Research output: Contribution to journal › Article › peer-review

73 Citations (Scopus)

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.

Original language	English
Pages (from-to)	3639-3642
Number of pages	4
Journal	Journal of the Chemical Society - Dalton Transactions
Issue number	20
DOIs	https://doi.org/10.1039/a905436g
Publication status	Published - 21 Oct 1999
Externally published	Yes

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@article{597e81b28d6f47829d9c4eb8717c2c5f,

title = "Selective isolation of Keggin ions using self-assembled superanion capsules",

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.",

author = "Alexander Drljaca and Hardie, {Michaele J.} and Raston, {Colin L.}",

year = "1999",

month = oct,

day = "21",

doi = "10.1039/a905436g",

language = "English",

pages = "3639--3642",

journal = "Journal of the Chemical Society, Dalton Transactions",

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T1 - Selective isolation of Keggin ions using self-assembled superanion capsules

AU - Drljaca, Alexander

AU - Hardie, Michaele J.

AU - Raston, Colin L.

PY - 1999/10/21

Y1 - 1999/10/21

N2 - 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.

AB - 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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