Complex formation of crown ethers with cations in water 13;organic solvent mixtures: Part X. Thermodynamics of interactions between Na⁺ ion and 15-crown-5 ether in acetone 13;water

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• 作者：Ma&#x142 ; gorzata Jó ; &#x17a ; wiak
• 关键词：Acetone 13 ; water mixtures ; 15-crown-5 ether ; Thermodynamic functions of complex formation ; 15-crown-5 ether/Na⁺ complex ; Preferential solvation
• 刊名：Journal of Molecular Liquids
• 出版年：2008
• 期刊代码：61_01677322
• 类别：ch
• 出版时间：30 May 2008
• 卷：141
• 期：1-2
• 页码：69-72
• 文件大小：188 K

摘要

The thermodynamic functions of complex formation of 15-crown-5 ether (15C5) with sodium cation (Na⁺) in the mixtures of water with acetone at 298.15 K have been calculated. The equilibrium constants of complex formation of 15C5 with Na⁺ have been determined by conductivity measurements. The enthalpic effect of complex formation has been measured by the calorimetric method. The complexes are enthalpy-stabilized but entropy-destabilized in acetone 13;water mixtures. The effects of hydrophobic hydration, preferential solvation of 15C5 by a molecule of organic solvent and solvation of Na⁺ on the complex formation processes have been discussed.