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首页> 外文期刊>Der Pharma Chemica: journal for medicinal chemistry, pharmaceutical chemistry and computational chemistry >Comparative Solvation Behaviour of Li+ and Na+ ions in Acetonitrile and Nitromethane Binary Mixtures at 298.15 K
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Comparative Solvation Behaviour of Li+ and Na+ ions in Acetonitrile and Nitromethane Binary Mixtures at 298.15 K

机译：Li +和Na +在298.15 K乙腈和硝基甲烷二元混合物中的比较溶剂化行为

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Molar conductance of lithium perchlorate (LiClO4), sodium perchlorate (NaClO4), sodium tetraphenylborate (NaBPh4), tetrabutylammonium perchlorate (Bu4NClO4) and tetrabutylammonium tetraphenylborate (Bu4NBPh4) have been measured in the range 0.005-0.2 mol kg-1 in binary mixtures of acetonitrile (AN) and nitromethane ( NM) containing 0, 10, 20, 40, 60, 80 and 100 mol% of NM in AN at 298.15 K. The experimental data of conductance has been analyzed using Shedlovsky method to evaluate limiting molar conductance (é?o) of these electrolytes which were further split to obtain limiting ionic conductances (???±o) of various ions present in salts. The ionic radii (ri) of ions in solutions were calculated using a modified form of Stoke’s law and were analyzed in the aspects of ion-solvent interactions. The solvated radii (ri) of Li+ and Na+ ions were found to be greater than rest of the ions in the entire solvent composition range which indicates strong solvation of the ions. Bu4N+ and Ph4B- ions were found to show poor solvation due to solvophobic interaction. Solvated radii (ri) values indicate preferential solvation of Li+ and Na+ ions in the intermediate solvent composition range than in pure AN and NM. Li+, however, is found to be better solvated than Na+ in AN+ NM binary mixtures at all compositions.
机译：在乙腈的二元混合物中测得的高氯酸锂（LiClO4），高氯酸钠（NaClO4），四苯硼酸钠（NaBPh4），高氯酸四丁铵（Bu4NClO4）和四丁基硼酸四丁铵（Bu4NBPh4）的摩尔电导在0.005-0.2 mol kg-1的范围内。 （AN）和硝基甲烷（NM）在298.15 K时在AN中含有0、10、20、40、60、80和100 mol％的NM。已经使用Shedlovsky方法分析了电导的实验数据，以评估极限摩尔电导（é这些电解质进一步分解以获得盐中存在的各种离子的极限离子电导率（Δo）。使用改良形式的斯托克定律计算溶液中离子的离子半径（ri），并在离子与溶剂相互作用的方面进行了分析。发现在整个溶剂组成范围内，Li +和Na +离子的溶剂化半径（ri）大于其余离子，这表明离子具有很强的溶剂化能力。发现Bu4N +和Ph4B-离子由于疏溶剂相互作用而显示出较差的溶剂化作用。溶剂化半径（ri）值表示在中溶剂组成范围内，Li +和Na +离子比纯AN和NM优先溶剂化。然而，发现在所有组成下，AN + NM二元混合物中的Li +均比Na +更好。

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