Journal
FRONTIERS IN CHEMISTRY
Volume 7, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2019.00112
Keywords
ionic liquid; hydrated IL; hydrogen bond basicity; water activity; NMR; hydrophobicity
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Funding
- Australian Research Council [DP130101263, IH140100018]
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Ionic liquids (ILs) are regarded as designable solvents finding use in a variety of applications. One of the challenges of the design and selection process is to understand the ionic liquid properties. In this work, we selected seven ILs containing three types of hydrophilic anions and examined several key properties, which are correlated to hydrophobicity. In particular, we measured the hydrogen bond basicity beta and water activity a w of IL and IL-water mixtures, and suggested that these two properties are lineally correlated particularly in hydrated ILs. We then used NMR to evaluate the chemical shift of H2O in hydrated ILs. Correlating the outcomes of each of these techniques with respect to understanding the hydrophobicity of the ILs is discussed. It is shown that water activity a w is the most facile technique to represent and understand hydrophobicity of ILs.
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