Utilizing water activity as a simple measure to understand hydrophobicity in ionic liquids

Han, Qi, Wang, Xungai and Bynre, Nolene 2019, Utilizing water activity as a simple measure to understand hydrophobicity in ionic liquids, Frontiers in chemistry, vol. 7, pp. 1-8, doi: 10.3389/fchem.2019.00112.

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Title Utilizing water activity as a simple measure to understand hydrophobicity in ionic liquids
Author(s) Han, Qi
Wang, XungaiORCID iD for Wang, Xungai orcid.org/0000-0002-3549-6769
Bynre, NoleneORCID iD for Bynre, Nolene orcid.org/0000-0002-9474-7644
Journal name Frontiers in chemistry
Volume number 7
Article ID 112
Start page 1
End page 8
Total pages 8
Publisher Frontiers Research Foundation
Place of publication Lausanne, Switzerland
Publication date 2019-03
ISSN 2296-2646
Keyword(s) NMR
hydrated IL
hydrogen bond basicity
ionic liquid
water activity
Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Summary 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 β and water activity aw of IL and IL-water mixtures, and suggested that these two properties are linearly 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 aw is the most facile technique to represent and understand hydrophobicity of ILs.
Language eng
DOI 10.3389/fchem.2019.00112
HERDC Research category C1 Refereed article in a scholarly journal
Grant ID Australian Research Council under its Discovery and ITRH schemes (DP130101263, IH140100018)
Copyright notice ©2019, Han, Wang and Bynre.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30120892

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