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Issue 9, 2012
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Comparing reduced partial charge models with polarizable simulations of ionic liquids

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Abstract

Molecular ionic liquids are typically characterized by strong electrostatic interactions resulting in a charge ordering and retardation of their translational and rotational behaviour. Unfortunately, this effect is often overestimated in classical molecular dynamics simulations. This can be circumvented in a twofold way: the easiest way is to reduce the partial charges of the ions to sub-integer values of ±0.7–0.9 e. The more realistic model is to include polarizable forces, e.g. Drude-oscillators, but it comes along with an increasing computational effort. On the other hand, charge-scaled models are claimed to take an average polarizability into account. But do both models have the same impact on structure and dynamics of molecular ionic liquids? In the present study several molecular dynamics simulations of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate are performed with different levels of polarization as well as with varying charge scaling factors of 0.74 to 0.90. The analysis of the structural and dynamical results are performed in different levels: from the atomic point of view over the molecular level to collective properties determined by the complete sample.

Graphical abstract: Comparing reduced partial charge models with polarizable simulations of ionic liquids

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Supplementary files

Article information


Submitted
21 Oct 2011
Accepted
23 Dec 2011
First published
27 Jan 2012

Phys. Chem. Chem. Phys., 2012,14, 3089-3102
Article type
Paper

Comparing reduced partial charge models with polarizable simulations of ionic liquids

C. Schröder, Phys. Chem. Chem. Phys., 2012, 14, 3089
DOI: 10.1039/C2CP23329K

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