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Dielectric relaxation spectroscopy: an old-but-new technique for the investigation of electrolyte solutions
| Content Provider | Scilit |
|---|---|
| Author | Hefter, Glenn Buchner, Richard |
| Copyright Year | 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. |
| Related Links | http://www.degruyter.com/downloadpdf/j/pac.ahead-of-print/pac-2019-1011/pac-2019-1011.xml |
| Ending Page | 1609 |
| Page Count | 15 |
| Starting Page | 1595 |
| ISSN | 00334545 |
| e-ISSN | 13653075 |
| DOI | 10.1515/pac-2019-1011 |
| Journal | Pure and Applied Chemistry |
| Issue Number | 10 |
| Volume Number | 92 |
| Language | English |
| Publisher | Walter de Gruyter GmbH |
| Publisher Date | 2020-10-25 |
| Access Restriction | Open |
| Subject Keyword | Pure and Applied Chemistry Physical Chemistry Dielectric Relaxation Electrolyte Hydration Icsc-36 Ion Association Ionic Liquids Mixtures Solutions Spectroscopy Journal: Pure and Applied Chemistry, Issue- 2 |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering |
