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Issue 22, 2015
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Comparing induced point-dipoles and Drude oscillators

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Abstract

Classical Molecular Dynamics simulations describing electrostatic interactions only by point charges can be augmented by the inclusion of atomic polarisabilities modelling charge flexibility. Two widely used models, Drude oscillators and induced point-dipoles, are compared in a systematic study using their respective implementations in CHARMM and AMBER. The question of necessity and importance of polarisable hydrogen atoms is raised and two implementations, in an implicit or explicit manner, are compared to the case of non-polarisable hydrogen atoms. For all these polarisability models, the strength of the respective atomic polarisabilities was incremented in steps of ten percent up to their full values. The influence of polarisability on the structure and dynamics of the ionic liquid EMIMCF3SO3, which is chosen as a test case, is studied thoroughly. Using appropriate model functions, the respective dynamical and structural data are fitted. Thus, a small set of parameters is deduced, which highlights the effect of polarisability. Generally, flexibility of the charge distribution leads to enhanced fluidity and less pronounced structure. As this usually occurs when adding a co-solvent to an ionic liquid, the inclusion of polarisability can be seen in much the same way in that it acts like an inner solvent.

Graphical abstract: Comparing induced point-dipoles and Drude oscillators

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Publication details

The article was received on 06 Oct 2014, accepted on 07 Nov 2014 and first published on 12 Nov 2014


Article type: Paper
DOI: 10.1039/C4CP04512B
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Citation: Phys. Chem. Chem. Phys., 2015,17, 14297-14306

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    Comparing induced point-dipoles and Drude oscillators

    M. Schmollngruber, V. Lesch, C. Schröder, A. Heuer and O. Steinhauser, Phys. Chem. Chem. Phys., 2015, 17, 14297
    DOI: 10.1039/C4CP04512B

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