Physical Chemistry Division, National Chemical Laboratory, Pune 411008, India.
J Phys Chem B. 2011 Feb 3;115(4):711-8. doi: 10.1021/jp110040a. Epub 2010 Dec 10.
The effect of solute-solvent and solvent-solvent interactions on the preferential solvation of solvatochromic indicators in binary mixtures of ionic liquids with molecular solvents has been investigated. The binary mixtures of the pyridinium-based ionic liquids 1-butylpyridinium tetrafluoroborate ([BP][BF4]), 1-butyl-3-methylpyridinium tetrafluoroborate ([3-MBP][BF4]), and 1-butyl-4-methylpyridinium tetrafluoroborate ([4-MBP][BF4]) with molecular solvents like water, methanol, and dichloromethane have been selected for this investigation. The effect of addition of ionic liquids to molecular solvents on the polarity parameters E(T)(N), Kamlet-Taft parameters, hydrogen bond donor ability (HBD) (α), hydrogen bond acceptor ability (HBA) (β), and polarizability (π*) was obtained. The polarity parameters of the mixture display nonideality on addition of ionic liquids to water and dichloromethane. On the other hand, strong synergetic effects were seen in the ionic liquid-methanol binary mixtures. The preferential solvation models have been employed to analyze the collected data in order to achieve information on solute-solvent interactions in these binary mixtures.
已研究了溶剂-溶质和溶剂-溶剂相互作用对离子液体与分子溶剂二元混合物中溶剂化指示剂优先溶解的影响。选择基于吡啶鎓的离子液体 1-丁基吡啶四氟硼酸盐 ([BP][BF4])、1-丁基-3-甲基吡啶四氟硼酸盐 ([3-MBP][BF4]) 和 1-丁基-4-甲基吡啶四氟硼酸盐 ([4-MBP][BF4]) 与水、甲醇和二氯甲烷等分子溶剂的二元混合物进行了这项研究。通过向分子溶剂中添加离子液体，获得了极性参数 E(T)(N)、Kamlet-Taft 参数、氢键供体能力 (HBD) (α)、氢键受体能力 (HBA) (β) 和极化率 (π*) 的影响。极性参数显示，向水和二氯甲烷中添加离子液体时，混合非理想性。另一方面，在离子液体-甲醇二元混合物中观察到强烈的协同效应。为了分析这些二元混合物中的溶质-溶剂相互作用，采用了优先溶解模型来分析所收集的数据。
