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Are There Stable Ion-Pairs in Room-Temperature Ionic Liquids? Molecular Dynamics Simulations of 1-n-Butyl-3-methylimidazolium Hexafluorophosphate
Abstract
Molecular dynamics simulations with an all-atom model were carried out to study the ionic liquid 1-n-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF(6)]. Analysis was carried out to characterize a number of structural and dynamic properties. It is found that the hydrogen bonds are weaker than expected, as indicated by their short lifetimes, which is due to the fast rotational motion of anions. Transport properties such as ion diffusion coefficients and ionic conductivity were also measured on the basis of long trajectories, and good agreement was obtained with experimental results. The phenomenon that electrical conductivity of ionic liquids deviates from the Nernst-Einstein relation was well reproduced in our work. On the basis of our analysis, we suggest that this deviation results from the correlated motion of cations and anions over time scales up to nanoseconds. In contrast, we find no evidence for long-lived ion-pairs migrating together.
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Molecular dynamics with coupling to an external bath
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Room-Temperature Ionic Liquids: Solvents for Synthesis and Catalysis. 2
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Room-Temperature Ionic Liquids. Solvents for Synthesis and Catalysis
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Ionic Liquids—New “Solutions” for Transition Metal Catalysis
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Metadata
- Authors
- Zhao, W., Leroy, F., Heggen, B., Zahn, S., Kirchner, B., Balasubramanian, S., & Müller-Plathe, F.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-10-14
- Volume
- 131
- Issue
- 43
- Pages
- 15825-15833
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2076240952
- Cited by
- 313
- References
- 49
- FWCI
- 8.12
- Type
- journal article
- Language
- en
- Open access
- closed
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- Zhao, W., Leroy, F., Heggen, B., Zahn, S., Kirchner, B., Balasubramanian, S., & Müller-Plathe, F. (2009). Are There Stable Ion-Pairs in Room-Temperature Ionic Liquids? Molecular Dynamics Simulations of 1-n-Butyl-3-methylimidazolium Hexafluorophosphate. Journal of the American Chemical Society. https://doi.org/10.1021/ja906337p
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