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How Polar Are Ionic Liquids? Determination of the Static Dielectric Constant of an Imidazolium-based Ionic Liquid by Microwave Dielectric Spectroscopy
Abstract
In a pilot study of the dielectric constant of room-temperature ionic liquids, we use dielectric spectroscopy in the megahertz/gigahertz regime to determine the complex dielectric function of five 1-alkyl-3-methylimidazolium salts, from which the static dielectric constant epsilon is obtained by zero-frequency extrapolation. The results classify the salts as moderately polar solvents. The observed epsilon-values at 298.15 K fall between 15.2 and 8.8, and epsilon decreases with increasing chain length of the alkyl residue of the cation. The anion sequence is trifluoromethylsulfonate > tetrafluoroborate approximately tetrafluorophosphate. The results indicate markedly lower polarities than found by spectroscopy with polarity-sensitive solvatochromic dyes.
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Cited by
Ionic liquids and catalysis: Recent progress from knowledge to applications
Olivier-Bourbigou, H., Magna, L., & Morvan, D. (2010) · Applied Catalysis A: General · doi:10.1016/j.apcata.2009.10.008 · Cited by 1,639
Understanding Ionic Liquids at the Molecular Level: Facts, Problems, and Controversies
Weingärtner, H. (2008) · Angewandte Chemie International Edition · doi:10.1002/anie.200604951 · Cited by 1,543
Self-citationIonic Liquids and Their Interaction with Cellulose
Pinkert, A., Marsh, K. N., Pang, S., & Staiger, M. P. (2009) · Chemical Reviews · doi:10.1021/cr9001947 · Cited by 1,508
The Electrostatic Screening Length in Concentrated Electrolytes Increases with Concentration
Smith, A. M., Lee, A. A., & Perkin, S. (2016) · The Journal of Physical Chemistry Letters · doi:10.1021/acs.jpclett.6b00867 · Cited by 611
Metadata
- Authors
- Wakai, C., Oleinikova, A., Ott, M., & Weingärtner, H.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2005-08-23
- Volume
- 109
- Issue
- 36
- Pages
- 17028-17030
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2021678689
- Cited by
- 531
- References
- 0
- FWCI
- 17.98
- Type
- journal article
- Language
- en
- Open access
- closed
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- Wakai, C., Oleinikova, A., Ott, M., & Weingärtner, H. (2005). How Polar Are Ionic Liquids? Determination of the Static Dielectric Constant of an Imidazolium-based Ionic Liquid by Microwave Dielectric Spectroscopy. The Journal of Physical Chemistry B. https://doi.org/10.1021/jp053946%2B
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