Ionic liquid (IL) mixtures have been proposed as a viable alternative to rationally fine-tune the physicochemical properties of ILs for a variety of applications. The understanding of the effects of mixing ILs on the properties of the mixtures is however only in the very early stages. Two series of ionic liquid mixtures, based on the 1-ethyl-3-methylimidazolium and 1-dodecyl-3-methylimidazolium cations, and having a common anion (tetrafluoroborate or bis(trifluoromethylsulfonyl)imide), have been prepared and deeply characterized via multiple NMR techniques. Diffusion and relaxation methods combined with 2D ion–ion correlation (nuclear Overhauser enhancement) experiments have been used for a better understanding of the interplay between dynamics and structure of IL mixtures. A crucial role of the anion in driving the mixture’s behavior emerged, making them important “dynamic probes” for gaining information of the polar and nonpolar regions of ionic liquids and their mixtures.

中文翻译：

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阴离子作为离子液体混合物的动态探针

离子液体（IL）混合物已被建议为合理地微调ILs在各种应用中的理化性质的可行替代方法。但是，仅在非常早期才了解混合ILs对混合物性能的影响。制备了基于1-乙基-3-甲基咪唑鎓阳离子和1-十二烷基-3-甲基咪唑鎓阳离子并具有共同阴离子（四氟硼酸根或双（三氟甲基磺酰基）酰亚胺）的两系列离子液体混合物，并通过多次深度表征NMR技术。扩散和弛豫方法与2D离子-离子相关性（核Overhauser增强）实验相结合，已被用来更好地理解IL混合物动力学与结构之间的相互作用。阴离子在驱动混合物行为中起着至关重要的作用，