A group contribution method for the influence of the temperature in the viscosity of magnetic ionic liquids

Ionic liquids are widely under research due to their potential properties as solvents. The prediction of their physicochemical properties is an important strategy to achieve a better knowledge for further applications. The present work applies a group contribution method to estimate the viscosity at different temperatures of a new generation of ionic liquids, magnetic ionic liquids (MILs), which are comprised by anions containing transition metal complexes. These new substances have received a high interest due to their response at the presence of a magnetic field. In this study the magnetic ionic liquids are based on the phosphonium cation [P-66614](+) with different chain lengths and on the magnetic anions: [GdCl6](3-), [MnCl4](2-), [FeCl4](-) and [CoCl4](2-). The database covers a wide range of temperature, 293.15-373.15 K, and viscosity 44-123 500 cP. The modelling estimations show a good agreement with the experimental results, presenting a mean percentage deviation of 7.64%. These results confirm the interest of this model for the estimation of viscosity and the influence of the temperature, which can be extended for a large variety of group combinations in magnetic ionic liquids leading to different applications. (C) 2013 Elsevier B.V. All rights reserved.