Selective isolation of Keggin ions using self-assembled superanion capsules†
Selective isolation of Keggin ions using self-assembled superanion capsules†
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DOI：
10.1039/a905436g
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
A. Drljaca;M. Hardie;C. Raston
中科院分区：
文献类型：
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作者：
A. Drljaca;M. Hardie;C. Raston
组成为[Al₁₃O₄(OH)₂₄(H₂O)₁₂][Na(18 - 冠 - 6)(H₂O)₂L₂(H⁺)ₓ]₀.₅ₓ⁻[{L(H⁺)ᵧ}]ₓ⁻·29H₂O（1）的晶体（其中x + z = 7，L = 对磺化杯[4]芳烃）是从含有单体和低聚铝物种、Na₄L和18 - 冠 - 6的水溶液中获得的。该晶体结构具有三个不同的单元：阳离子型Keggin离子[Al₁₃O₄(OH)₂₄(H₂O)₁₂]⁷⁺、阴离子型胶囊[Na(18 - 冠 - 6)(H₂O)₂L₂(H⁺)ₓ]ₓ⁻以及一种含水的杯芳烃。阴离子型胶囊包含一个由18 - 冠 - 6和两个反式水分子配位的中心钠离子，它又被两个头对头排列的对磺化杯[4]芳烃分子所包裹。不同的组分在固态下通过复杂的氢键模式结合在一起，并由其他超分子相互作用（如π - π堆积）辅助。
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.