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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Ion-Association Analysis between Inorganic Anions and Symmetrical Tetraalkylammonium Ions in Aqueous-Acetonitrile Media by Capillary Zone Electrophoresis
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Ion-Association Analysis between Inorganic Anions and Symmetrical Tetraalkylammonium Ions in Aqueous-Acetonitrile Media by Capillary Zone Electrophoresis

机译：乙腈介质中无机阴离子与对称四烷基铵离子的离子缔合毛细管区带电泳分析

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摘要

Weak ion-association equilibrium was analyzed in a water-acetonitrile solution at 25 deg C by capillary zone electrophoresis using an ordinary silica capillary.The ion associates examined were formed between some inorganic anions and symmetrical tetraalkylammonium ions,where a series of acetonitrile compositions up to 62.2%(m/m)were investigated.Ion-association constants,K_(ass),were determined by analyzing the changes in the electrophoretic mobility;the K_(ass)values for most of the anions increased up to about 47%(m/m)acetonitrile,beyond which they remained constant,or decreased slightly.The ion-association equilibrium between tetramethylammonium and bromide ions in aqueous-aceto-nitrile and in aqueous-ethanol media were compared through the Gibbs free energy of transfer,which revealed that the extent of the equilibrium in aqueous-acetonitrile media is dependent mainly on the increasing instability of Br~-.On the other hand,those in aqueous-ethanol media depend on the instabilities of both tetramethylammonium and bromide ions.
机译：在25°C的水-乙腈溶液中使用普通硅胶毛细管进行毛细管区带电泳，分析了弱的离子缔合平衡，所检测到的离子缔合是在一些无机阴离子与对称的四烷基铵离子之间形成的，其中一系列乙腈组成直至研究了62.2％（m / m）。通过分析电泳迁移率的变化确定了离子缔合常数K_（ass）;大多数阴离子的K_（ass）值增加了约47％（m / m）乙腈，超过它们保持恒定或略有下降。通过吉布斯转移自由能比较了乙腈水溶液和乙醇水溶液中四甲基铵和溴化物离子之间的离子缔合平衡，结果表明：乙腈水溶液中的平衡程度主要取决于Br〜-的增加的不稳定性。另一方面，乙醇水溶液中的平衡程度取决于o的不稳定性。 f既是四甲基铵离子又是溴离子。

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