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Issue 37, 2010
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Speciation of chloroindate(III) ionic liquids

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A range of chloroindate(III) ionic liquid systems was prepared by mixing of 1-alkyl-3-methylimidazolium chloride with indium(III) chloride in various ratios, expressed as the mol fraction of indium(III) chloride, χInCl3. For χInCl3 ≤ 0.50, the products were liquids, whereas for χInCl3 > 0.50, the products were biphasic (suspensions of a solid in an ionic liquid). Speciation of these chloroindate(III) systems was carried out using a wide range of techniques: differential scanning calorimetry (DSC), polarised optical microscopy (POM), liquid-state and solid-state 115In NMR spectroscopy, X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS). Ionic liquids prepared using an excess of the organic chloride (χInCl3 < 0.5) contained [InCl6]3, [InCl5]2 and [InCl4] anions, in proportions dependent on the χInCl3 value. Equimolar mixtures yielded single compounds: 1-alkyl-3-methylimidazolium tetrachloroindates(III). Systems containing an excess of indium(III) chloride (χInCl3 > 0.5) contained indium(III) chloride powder suspended in a neutral tetrachloroindate ionic liquid.

Graphical abstract: Speciation of chloroindate(iii) ionic liquids

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Publication details

The article was received on 18 May 2010, accepted on 08 Jul 2010 and first published on 11 Aug 2010

Article type: Paper
DOI: 10.1039/C0DT00497A
Citation: Dalton Trans., 2010,39, 8679-8687
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    Speciation of chloroindate(III) ionic liquids

    D. C. Apperley, C. Hardacre, P. Licence, R. W. Murphy, N. V. Plechkova, K. R. Seddon, G. Srinivasan, M. Swadźba-Kwaśny and I. J. Villar-Garcia, Dalton Trans., 2010, 39, 8679
    DOI: 10.1039/C0DT00497A

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