Journal article
Dielectric relaxation spectroscopy: An old-but-new technique for the investigation of electrolyte solutions
Pure and Applied Chemistry, Vol.92(10), pp.1595-1609
2020
Abstract
The use of dielectric relaxation spectroscopy (DRS) for studying electrolyte solutions is reviewed, focussing on the authors’ investigations over the last three decades. It is shown that this often-overlooked technique provides powerful insights into the nature of ion-ion and ion-solvent interactions. DRS is revealed to be particularly useful for detection of weak ion association and, due to its unique ability to detect solvent-separated species, the quantitation of ion pairing. It is demonstrated that DRS correctly determines chemical speciation for ion-paired systems where major spectroscopic techniques (NMR, Raman, UV-vis) fail. DRS also provides important insights into ion solvation. In aqueous solutions, it has been used to build up a coherent set of ‘effective’ hydration numbers for ions based on the dynamics of proximate water molecules, and has a unique ability to detect ‘slow’ water resulting from hydrophilic and hydrophobic hydration of solutes. DRS has been especially useful for characterising the behaviour of ionic liquids (ILs), e.g. showing they possess rather low dielectric constants and, surprisingly, contain no significant concentrations of ion pairs. Neat ILs and their mixtures with molecular solvents are shown by ultra-broadband DRS to exhibit extremely complicated behaviour especially at frequencies in the THz region.
Details
- Title
- Dielectric relaxation spectroscopy: An old-but-new technique for the investigation of electrolyte solutions
- Authors/Creators
- G. Hefter (Author/Creator)R. Buchner (Author/Creator)
- Publication Details
- Pure and Applied Chemistry, Vol.92(10), pp.1595-1609
- Publisher
- International Union of Pure and Applied Chemistry
- Identifiers
- 991005544729607891
- Copyright
- ©2020 IUPAC & De Gruyter.
- Murdoch Affiliation
- Chemistry and Physics
- Language
- English
- Resource Type
- Journal article
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Source: InCites
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 2 Chemistry
- 2.89 Ionic, Molecular & Complex Liquids
- 2.89.677 Liquid Water
- Web Of Science research areas
- Chemistry, Multidisciplinary
- ESI research areas
- Chemistry