Hydration Behavior Study of Imidazolium Based ILs in Water

Abstract:

These ILs were chosen to provide an understanding of the influence of the cation alkyl chain length, and the anion influence on the volumetric properties. Densities for aqueous solutions of ionic liquids having 1-butyl-3-methylimidazolium as cation and chloride, bromide, iodide and acetate as anions were accurately measured at various concentrations and temperature, (288.15, 293.15, 298.15, 303.15 and 308.15) K. The results have been discussed in terms of hydrophobic hydration, hydrophobic interactions, and water structural changes in aqueous medium. The data were used in evaluating thermodynamic properties as apparent molar volumes, and apparent molar expansions. Apparent molar volumes were found to increase with temperature.

• Periodical: Applied Mechanics and Materials (Volume 625)
• Pages: 553-556
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.625.553
• Online since: September 2014
• Authors: Bhajan Lal*
• Keywords: Apparent Molar Isobaric Expansions, Density, Ionic Liquid (IL), Molar Volume

References

[1] Heintz, C. Wertz, Ionic liquids: A most promising research field in solution chemistry and thermodynamics, Pure Appl. Chem. 78 (2006) 1587–1593.

DOI: 10.1351/pac200678081587

[2] R. L. Gardas, D. H. Dagade, J. A. P. Coutinho, K. J. Patil, Thermodynamic studies of ionic interactions in aqueous solutions of imidazolium-based ionic liquids [Emim][Br] and [Bmim][Cl], J. Phys. Chem. 112 (2008) 3380-3389.

DOI: 10.1021/jp710351q

[3] P. Bonhote, A. P. Dias, N. Papargeorgiou, K. Kalyanasundaram, M. Gratzel, Hydrophobic, highly conductive ambient-temperature molten salts, Inorg. Chem. 35 (1996) 1168–1178.

DOI: 10.1021/ic951325x

[4] J. H. Davis Jr., Task specific ionic liquids, Chem. Lett. 33 (2004) 1072–1077.

DOI: 10.1246/cl.2004.1072

[5] Y. Shim, M. Y. Choi, H. J. Kim,  A Molecular dynamics computer simulation study of room-temperature ionic liquids. I. Equilibrium Solvation Structure and Free Energetics, J. Chem. Phys. 122 (2005) 044510–044512.

DOI: 10.1063/1.1819317

[6] J. Klomfar, M. Souckova, J. Patek, Temperature dependence measurements of the density at 0. 1 MPa for 1-Alkyl-3-methylimidazolium-Based Ionic Liquids with the Trifluoromethanesulfonate and Tetrafluoroborate Anion, J. Chem. Eng. Data 55 (2010).

DOI: 10.1021/je100185e

[7] A. Chandran, K. Prakash, S. Senapati, Structure and dynamics of acetate anion-based ionic liquids from molecular dynamics study, Chem. Phys. 374 (2010) 46–54.

DOI: 10.1016/j.chemphys.2010.06.011

[8] F. J. Millero, in: R. A. Horne (Ed. ), Structure and Transport Process in Water and Aqueous Solutions, John Wiley, NY, 1972, p.519–564 (Chapter 13).

[9] O. Redlich, D. M. Meyer, The Molal Volumes of Electrolytes, Chem. Rev. 64 (1964) 221-227.

DOI: 10.1021/cr60229a001

[10] H. S. Harned, B. B. Owen, The Physical Chemistry of Electrolyte Solutions, ACS, New York, (1958).