Thermophysical properties of alkylammonium-based ionic liquids


K. Machanová1, Z. Sedláková1, A. Boisset2, M. Bendová1, J. Jacquemin2 and K. Aim1

1E. Hála Laboratory of Thermodynamics, Institute of Chemical Process Fundamentals AS CR, v. v. i., Prague, Czech Republic
2Université François Rabelais, Laboratoire PCMB, Equipe CIME, Faculté des Sciences et Techniques, Tours, France

Keywords: experimental
property: density viscosity
material: ionic liquids

Experimental data for homologous series of n-alkyl-triethylammonium bis[(trifluoromethyl)-sulfonyl]imide ionic liquids (abbrev. [NR222][Ntf2] with R = 6, 7, 8, 10, 12, or 14) will be discussed. These ILs were selected for their potential applications as reaction media in stereoselective hydrogenations using Ru-BINAP catalyst, as they contribute to a better yield of the required enantiomer [2].

Volumetric properties (densities and molar volumes) and viscosities of dried ILs were carried out using pycnometric method and a dynamic rheometer (AR 1000 rheometer using a conical geometry). The experimental measurements took place at atmospheric pressure at temperatures between 293.15 and 363.15 K.

A linear correlation was used to fit the experimental volumetric properties. Due to the non-Arrhenius behaviour of selected ILs, the correlation of Vogel-Fülcher-Tammann (VFT) was employed to represent the temperature dependence of their viscosities.

Furthermore, volumetric properties are then compared to those estimated using Jacquemin’s modification of Rebelo’s function [2], which calculates molar volumes of ionic liquids from the effective volumes of their ions. From this study, an extension of Jacquemin’s group contribution model [3] have been then established and tested for alkylammonium-based ILs. 

Acknowledgments 

This work is supported by the Czech Science Foundation under Grant No. 203/09/P141, by the Ministry of Education, Youth and Sports of the Czech Republic under Grant MEB 021009, and by the Grant No. IAA400720710 awarded by the Grant Agency of the Academy of Sciences of the Czech Republic.

References
  1. T. Floriš, P. Klusoň, L.Bártek, H. Pelantová, Appl. Cata. A 366, 160 (2009).

  2. L. P. N. Rebelo, V. Najdanovic-Visak, R. Gomes de Azevedo, J. M. S. S. Esperança, M. Nunes da Ponte, H. J. R. Guedes, H. C. de Sousa, J. Szydlowski, J. N. Canongia Lopes, T. C. Cordeiro, in Ionic Liquids IIIA: Fundamentals, Progress, Challenges, and Opportunities-Properties and Structure, ACS Symposium Series 901 ed. by R. D. Rogers and K. R. Seddon (American Chemical Society, Washington DC, 2005) pp. 270-291.

  3. J. Jacquemin, R. Ge, P. Nancarrow, D. W. Rooney, M. F. Costa Gomes, A. A. H. Pádua, C. Hardacre, J. Chem. Eng. Data, 53, 716, 2008.

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