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Constrained molecular dynamics and the mean potential for an ion pair in a polar solvent

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Ciccotti, Giovanni, Ferrario, Mauro, Hynes, James T., Kapral, Raymond·1989·Chemical Physics

Abstract

Abstract A constrained molecular dynamics (MD) method for the calculation of the potential of mean force is described, and applied to study the solvent-separated and contact ion pair equilibrium in a polar solvent. The method uses holonomic constraints on the MD to fix ion pair internuclear separation. The average force exerted on the ions by the solvent is computed as a function of ion separation, and the potential of mean force follows from an integration of the mean force. The ion pair mean potential, the reaction equilibrium constant and the solvent structure in the vicinity of the ions are examined for two model solvents with differing molecular dipole moments. The relevance of this study for the dynamics of the contact ion pair-solvent separated ion pair reaction is pointed out.

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Metadata

Authors
Ciccotti, G., Ferrario, M., Hynes, J. T., & Kapral, R.
Venue
Chemical Physics
Publisher
Elsevier BV
Published
1989-01
Volume
129
Issue
2
Pages
241-251
ISSN
0301-0104 (ISSN-L)
OpenAlex
W2004904244
Cited by
251
References
0
FWCI
7.64
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Constrained molecular dynamics and the mean potential for an ion pair in a polar solvent. https://app.cochat.ai/papers/10.1016/0301-0104(89)80010-2
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Ciccotti, G., Ferrario, M., Hynes, J. T., & Kapral, R. (1989). Constrained molecular dynamics and the mean potential for an ion pair in a polar solvent. Chemical Physics. https://doi.org/10.1016/0301-0104(89)80010-2

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