Repository: Freie Universit├Ąt Berlin, Math Department

Force fields for studying structure and dynamics of imidazolium based ionic liquids - a critical review of recent developments

Dommert, F. and Wendler, K. and Berger, R. and Delle Site, L. and Holm, C. (2012) Force fields for studying structure and dynamics of imidazolium based ionic liquids - a critical review of recent developments. ChemPhysChem, 13 . p. 1625.

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Classical molecular dynamics simulations are a valuable tool to study the mechanisms that dominate the properties of ionic liquids (ILs) on the atomistic and molecular level. However, the basis for any molecular dynamics simulation is an accurate force field describing the effective interactions between all atoms in the IL. Normally this is done by empirical potentials which can be partially derived from quantum mechanical calculations on simple subunits or have been fitted to experimental data. Unfortunately, the number of accurate classical non-polarizable models for ILs that allow a reasonable description of both dynamical and statical properties is still low. However, the strongly increasing computational power allows one to apply computationally more expensive methods, and even polarizable-force-field-based models on time and length scales long enough to ensure a proper sampling of the phase space. This review attempts to summarize recent achievements and methods in the development of classical force fields for ionic liquids. As this class of salts covers a large number of compounds, we focus our review on imidazolium-based ionic liquids, but show that the main conclusions are valid for non-imidazolium salts, too. Insight obtained from recent electronic density functional results into the parametrization of partial charges and on the influence of polarization effects in bulk ILs is highlighted. An overview is given of different available force fields, ranging from the atomistic to the coarse-grained level, covering implicit as well as explicit modeling of polarization. We show that the recently popular usage of the ion charge as fit parameter can looked upon as treating polarization effects in a mean-field matter.

Item Type:Article
Subjects:Physical Sciences > Physics
Physical Sciences > Chemistry
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics > BioComputing Group
ID Code:1202
Deposited By: BioComp Admin
Deposited On:19 Feb 2013 13:56
Last Modified:21 Feb 2013 13:18

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