Physical and electrochemical properties of thioether-functionalized ionic liquids

Torriero, Angel A. J., Siriwardana, Amal I., Bond, Alan M., Burgar, Iko M., Dunlop, Noel F., Deacon, Glen B. and MacFarlane, Douglas R. 2009, Physical and electrochemical properties of thioether-functionalized ionic liquids, The journal of physical chemistry b, vol. 113, no. 32, pp. 11222-11231, doi: 10.1021/jp9046769.

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Title Physical and electrochemical properties of thioether-functionalized ionic liquids
Author(s) Torriero, Angel A. J.ORCID iD for Torriero, Angel A. J.
Siriwardana, Amal I.
Bond, Alan M.
Burgar, Iko M.
Dunlop, Noel F.
Deacon, Glen B.
MacFarlane, Douglas R.
Journal name The journal of physical chemistry b
Volume number 113
Issue number 32
Start page 11222
End page 11231
Total pages 10
Publisher American Chemical Society
Place of publication Washington D.C.
Publication date 2009-07-23
ISSN 1520-6106
Summary The preparation and characterization of a series of ionic liquids based on S-alkyl thiolonium, S-alkyl thiotetrazolium, or S-alkyl thiobenzolium cations coupled with bis(trifluoromethanesulfonyl)amide, trifluoromethanesulfonate, alkyl phosphate, chloride, and hexafluorophosphate anions are reported. All are liquid at room temperature, except the chloride salt, which has a melting point of 92 °C. The electrochemical characteristics of this class of ionic liquid have been determined by cyclic voltammetry. Potential windows of the ionic liquids have been obtained at glassy carbon, platinum, and gold electrodes and found to be the largest at glassy carbon, but are limited by oxidation of the thioether-functionalized cation. The voltammetry of IUPAC reference potential scale systems, ferrocene/ferrocenium, cobaltocenium/cobaltocene, and decamethylferrocene/decamethylferrocenium have been evaluated, with the last being most widely applicable. Nonadditivity of Faradaic current is found in the voltammograms of decamethylferrocene in the presence of ferrocene and cobaltocenium. Diffusion coefficient, viscosity, ionic conductivity, double layer capacitance, and other physical properties have also been measured. The dependence of the diffusion coefficient vs viscosity follows the Stokes−Einstein relationship. The properties of the ionic liquids are compared with the related imidazolium family of ionic liquids.
Language eng
DOI 10.1021/jp9046769
Field of Research 030604 Electrochemistry
030505 Physical Organic Chemistry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, American Chemical Society
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