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Acoustic and Volumetric Properties of Diluted Solutions of Water in Ionic Liquids

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Abstract

Herein, we report the densities and speeds of sound in binary mixtures of three hydrophobic and one hydrophilic ionic liquids: 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide, [C4mim][NTf2], 1-butyl-1-methylpyrrolidinium bis[(trifluoromethyl)sulfonyl]imide, [C4mpyr][NTf2], 1-propyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide, [C3mim][NTf2] and 1-ethyl-3-methylimidazolium thiocyanate, [C2mim][SCN], with water at 298.15 K and 0.1 MPa. The concentration range of water, which encompassed relatively small values well below the saturation point, is often regarded as an impurity for hydrophobic ionic liquids. On the basis of experimental results the molar volume, adiabatic molar compressibility, partial molar volume and apparent molar volume, as well as, partial molar and apparent molar isentropic compressibility properties were then calculated. Interesting results are obtained using the solutions based on the hydrophilic [C2mim][SCN], since these mixtures are characterized by relatively low density and high values of speed of sound. Furthermore, the partial molar volumes and partial molar adiabatic compressibilities of water in solution with [C2mim][SCN] are the lowest among the investigated in mixtures with ionic liquids. However, in the case of the hydrophobic ionic liquid solutions, only small differences are observed for molar adiabatic compressibilities with the change of the cation structure, i.e. for water + [C4mim][NTf2] or + [C4mpyr][NTf2]. A more pronounced difference has been observed for the partial molar compressibility of water in solutions with these two ionic liquids.

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Authors and Affiliations

  1. Institute of Chemistry, University of Silesia, Szkolna 9, 40-006, Katowice, Poland

    Justyna Skowronek, Monika Geppert-Rybczyńska, Mirosław Chorążewski, Sylwia Jężak, Michał Zorębski, Edward Zorębski, Monika Żarska & Marzena Dzida

  2. The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen’s University of Belfast, Stranmillis Road, Belfast, BT9 5AG, UK

    Johan Jacquemin, Peter Goodrich & Jorge Alvarez Vicente

  3. Donserv, Michała Spisaka 31, 02-495, Warsaw, Poland

    Wojciech Kaca & Paweł Berdyczko

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  1. Justyna Skowronek
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  2. Monika Geppert-Rybczyńska
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Correspondence to Monika Geppert-Rybczyńska or Johan Jacquemin.

Electronic supplementary material

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10953_2015_327_MOESM1_ESM.pdf

Electronic supplementary material: Figures S1– S13 contain 1H and 13C NMR spectra and TGA analysis of 1-propyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide [C3mim][NTf2] and comparisons of apparent and partial molar volumes and adiabatic compressibilities of water in each ILs separately. (PDF 426 kb)

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Skowronek, J., Geppert-Rybczyńska, M., Jacquemin, J. et al. Acoustic and Volumetric Properties of Diluted Solutions of Water in Ionic Liquids. J Solution Chem 44, 824–837 (2015). https://doi.org/10.1007/s10953-015-0327-z

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  • DOI: https://doi.org/10.1007/s10953-015-0327-z

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