Structure, thermodynamic and transport properties of imidazolium-based bis(trifluoromethylsulfonyl)imide ionic liquids from molecular dynamics simulations

Eleni Androulaki, Niki Vergadou, Javier Ramos, Ioannis G. Economou

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Molecular dynamics (MD) simulations have been performed in order to investigate the properties of [C n mim +][Tf 2N] (n=4,8,12) ionic liquids (ILs) in a wide temperature range (298.15498.15K) and at atmospheric pressure (1 bar). A previously developed methodology for the calculation of the charge distribution that incorporates ab initio quantum mechanical calculations based on density functional theory (DFT) was used to calculate the partial charges for the classical molecular simulations. The wide range of time scales that characterize the segmental dynamics of these ILs, especially at low temperatures, required very long MD simulations, on the order of several tens of nanoseconds, to calculate the thermodynamic (density, thermal expansion, isothermal compressibility), structural (radial distribution functions between the centers of mass of ions and between individual sites, radial-angular distribution functions) and dynamic (relaxation times of the reorientation of the bonds and the torsion angles, self-diffusion coefficients, shear viscosity) properties. The influence of the temperature and the cation's alkyl chain length on the above-mentioned properties was thoroughly investigated. The calculated thermodynamic (primary and derivative) and structural properties are in good agreement with the experimental data, while the extremely sluggish dynamics of the ILs under study renders the calculation of their transport properties a very complicated and challenging task, especially at low temperatures.

Original languageEnglish
Pages (from-to)1139-1152
Number of pages14
JournalMolecular Physics
Volume110
Issue number11-12
DOIs
Publication statusPublished - 10 Jun 2012

Keywords

  • imidazolium
  • ionic liquids
  • molecular simulation
  • physical properties

ASJC Scopus subject areas

  • Biophysics
  • Molecular Biology
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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