Predicting the viscosity and electrical conductivity of ionic liquids on the basis of theoretically calculated ionic volumes

Abstract

AbstractSelected physical properties of the ionic liquids might be quantitatively predicted based on the volumes of the ions these systems are composed of. It is demonstrated that the ionic volumes calculated using relatively simple theoretical quantum chemistry methods can be utilised to estimate the viscosities and electrical conductivities of various commonly used ionic liquids. The fitting formulas of the exponential form are offered and their predictive usefulness is verified. The quality of such predictions is discussed on the basis of several ionic liquids involving [Tf2N]‑ and [BF4]‑ anions and 16 various cations. The dependence of the viscosity and electrical conductivity of the ionic liquids on the temperature is also investigated and the temperature-dependent equations are derived and compared to the experimentally measured values.Keywords: ionic liquidsviscosityelectrical conductivity Additional informationFundingThis work was supported by Switzerland through the Swiss Contribution to the enlarged European Union [grant number PSPB-051/2010] and partially by the Polish Ministry of Science and Higher Education [grant number DS/530-8376-D499-14].