NaSCN behaviour in acetone-methanol mixture by vapor-liquid equilibrium experiments and nuclear magnetic resonance spectroscopy results of preferential solvation
NaSCN behaviour in acetone-methanol mixture by vapor-liquid equilibrium experiments and nuclear magnetic resonance spectroscopy results of preferential solvation
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发表时间：
1999
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通讯作者：
Mc. Iliuta;F. Thyrion
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作者：
Mc. Iliuta;F. Thyrion
在常压下测量了丙酮-甲醇-硫氰酸钠体系在不同盐摩尔分数下的汽液平衡，以强调先前报道的不同盐摩尔分数丙酮的盐入和盐出之间的反常交叉效应。此外。为了研究离子(阳离子和阴离子)在混合溶剂中的择优溶剂化行为，测量了不同盐摩尔比的硫氰酸钠存在下丙酮-甲醇混合物的H-1、Na-23和C-13核磁共振化学位移。阴离子化学位移揭示了甲醇的优先溶剂化作用。关于阳离子化学位移，观察到并解释了这种混合物的一种特殊行为，即在富醇区域被丙酮优先溶剂化，在剩余区域被甲醇优先溶剂化。钠在这些混合物中的溶剂化强烈地依赖于溶剂-溶剂相互作用。对离子溶剂化的光谱研究和汽液平衡实验进行了比较。
Vapour-liquid equilibrium measurements in acetone - methanol - NaSCN system at different salt molarities were performed at atmospheric pressure to emphasise the anomalous crossover effect between salting-in and salting-out on the acetone, reported previously at different salt mole fractions. In addition. H-1, Na-23 and C-13 NMR chemical shifts were measured in acetone - methanol mixture in the presence of sodium thiocyanate at various salt molarities to study the preferential solvation of ions (cation and anion) in the mixed solvent. The anion chemical shift reveals preferential solvation for methanol. Concerning the cation chemical shift, a particular behaviour of this mixture was observed and interpreted by the preferential solvation by acetone in the methanol-rich regions and by methanol in the remaining regions. The solvation of sodium in these mixtures was shown to depend strongly on the solvent-solvent interactions. A comparison between spectroscopic studies of ion solvation and vapour-liquid equilibrium experiments was presented.