Buchner, Richard and Agieienko, Vira (2023) Ethaline and related systems: may be not "deep " eutectics but clearly interesting ionic liquids. PURE AND APPLIED CHEMISTRY, 95 (7). pp. 833-840. ISSN 0033-4545, 1365-3075
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Ethaline, the 1:2 molar ratio mixture of ethylene glycol (EG) and choline chloride (ChCl), is generally regarded as a typical type III deep eutectic solvent (DES). However, careful differential scanning calorimetry (DSC) of EG + ChCl mixtures surprisingly revealed that the liquidus lines of the phase diagram apparently follow the predictions for an ideal binary non-electrolyte mixture. Applying broad-band dielectric relaxation spectroscopy to room-temperature solutions of ChCl, and of the related salts choline iodide and chlorocholine chloride, in EG up to saturation, we explored the possible reasons for this conundrum. It appears that in these solutions free ions are rather scarce. Instead, contact ion pairs and larger aggregates predominate.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SOLVENTS; MIXTURES; WATER; Deep eutectic solvent; dielectric spectroscopy; ethaline; ICSC-37; ion association; phase diagram; solvation |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Mar 2024 17:14 |
| Last Modified: | 09 Mar 2024 17:14 |
| URI: | https://pred.uni-regensburg.de/id/eprint/59476 |
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