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Using XPS to determine solute solubility in room temperature ionic liquids

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2007
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Journal Article

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Silvester, D. and Broder, T. and Aldous, L. and Hardacre, C. and Crossley, A. and Compton, R. 2007. Using XPS to determine solute solubility in room temperature ionic liquids. The Analyst. 132: pp. 196-198.
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The Analyst
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Abstract

X-Ray Photoelectron Spectroscopy (XPS) was used to quantify the amount of bromide ions present in two samples of [C4mpyrr]Br dissolved in the room temperature ionic liquid (RTIL) [C4mpyrr][N(Tf)2]. One sample was of a known concentration (0.436 Br atom%); the other was a saturated solution. The results obtained from quantitative XPS analysis indicated that the saturated sample had a concentration, or solubility, of 0.90 Br atom% (746 mM) at 298 K, which was then independently confirmed by potential-step chronoamperometry of the same solution.