Atomistic Force Field for Pyridinium-Based Ionic Liquids: Reliable Transport Properties

作者：Voroshylova Iuliia V; Chaban Vitaly V^*

来源：Journal of Physical Chemistry B, 2014, 118(36): 10716-10724.

DOI：10.1021/jp5054875

Reliable force field (FF) is a central issue in successful prediction of physical chemical properties via computer simulations. This work introduces refined FF parameters for six popular ionic liquids (ILs) of the pyridinium family (butylpyridinium tetrafluoroborate, bis(trifluoromethanesulfonyl)imide, dicyanamide, hexafluorophosphate, triflate, chloride). We elaborate a systematic procedure, which allows accounting for specific cationanion interactions in the liquid phase. Once these interactions are described accurately, all experimentally determined transport properties can be reproduced. We prove that three parameters per interaction site (atom diameter, depth of potential well, point electrostatic charge) provide a sufficient basis to predict thermodynamics (heat of vaporization, density), structure (radial distributions), and transport (diffusion, viscosity, conductivity) of ILs at room conditions and elevated temperature. The developed atomistic models provide a systematic refinement upon the well-known Canongia LopesPadua (CL%26P) FF. Together with the original CL%26P parameters the present models foster a computational investigation of ionic liquids.

• 出版日期2014-9-11