On the concept of ionicity in ionic liquids

MacFarlane, Douglas R., Forsyth, Maria, Izgorodina, Ekaterina I., Abbott, Andrew P., Annat, Gary and Fraser, Kevin 2009, On the concept of ionicity in ionic liquids, Physical chemistry chemical physics, vol. 11, no. 25, pp. 4962-4967, doi: 10.1039/B900201D.

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Title On the concept of ionicity in ionic liquids
Author(s) MacFarlane, Douglas R.
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Izgorodina, Ekaterina I.
Abbott, Andrew P.
Annat, Gary
Fraser, Kevin
Journal name Physical chemistry chemical physics
Volume number 11
Issue number 25
Start page 4962
End page 4967
Total pages 6
Publisher Royal Society of Chemistry
Place of publication Cambridge, England
Publication date 2009
ISSN 1463-9076
Summary Ionic liquids are liquids comprised totally of ions. However, not all of the ions present appear to be available to participate in conduction processes, to a degree that is dependent on the nature of the ionic liquid and its structure. There is much interest in quantifying and understanding this ‘degree of ionicity’ phenomenon. In this paper we present transport data for a range of ionic liquids and evaluate the data firstly in terms of the Walden plot as an approximate and readily accessible approach to estimating ionicity. An adjusted Walden plot that makes explicit allowance for differences in ion sizes is shown to be an improvement to this approach for the series of ionic liquids described. In some cases, where diffusion measurements are possible, it is feasible to directly quantify ionicity via the Nernst–Einstein equation, confirming the validity of the adjusted Walden plot approach. Some of the ionic liquids studied exhibit ionicity values very close to ideal; this is discussed in terms of a model of a highly associated liquid in which the ion correlations have similar impact on both the diffusive and conductive motions. Ionicity, as defined, is thus a useful measure of adherence to the Nernst–Einstein equation, but is not necessarily a measure of ion availability in the chemical sense.
Language eng
DOI 10.1039/B900201D
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, Owner Societies
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030200

Document type: Journal Article
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