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Abstract

In the last few years, ionic liquids (ILs) have been the focus of extensive studies concerning the relationship between structure and properties and how this impacts their application. Despite a large number of studies, several topics remain controversial or not fully answered, such as: the existence of ion pairs, the concept of free volume and the effect of water and its implications in the modulation of ILs physicochemical properties. In this paper, we present a critical review of state‐of-the‐art literature regarding structure–property relationship of ILs, we re‐examine analytical theories on the structure–property correlations and present new perspectives based on the existing data. The interrelation between transport properties (viscosity, diffusion, conductivity) of IL structure and free volume are analysed and discussed at a molecular level. In addition, we demonstrate how the analysis of microscopic features (particularly using NMR‐derived data) can be used to explain and predict macroscopic properties, reaching new perspectives on the properties and application of ILs.

Original languageEnglish
Article number7745
Pages (from-to)1-37
Number of pages37
JournalInternational Journal of Molecular Sciences
Volume21
Issue number20
DOIs
Publication statusPublished - 19 Oct 2020

Keywords

  • Free volume
  • Ion pair
  • Ionic liquid
  • Physicochemical properties
  • Supramolecular organization
  • Transport properties
  • Water

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