Agieienko, Vira and Buchner, Richard (2022) Is ethaline a deep eutectic solvent? PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 24 (9). pp. 5265-5268. ISSN 1463-9076, 1463-9084
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With the present contribution we clarify the phase behaviour of choline chloride (ChCl) + ethylene glycol (EG) mixtures for ChCl mole fractions (x(ChCl)) less than 0.333 and temperatures below 323 K by providing melting points obtained by differential scanning calorimetry for samples containing <300 ppm of water. We show that ethaline, the ChCl : EG mixture of molar ratio 1 : 2 that is usually believed to be the composition of the eutectic point, actually lies in the ChCl-saturated region of the {ChCl + EG} phase diagram. The real eutectic point was found to be at the 1 : 4.85 molar ratio of ChCl : EG (x(ChCl) = 0.171) which is characterized by a melting point of 244 K. This temperature is only 16 K below the melting point of neat EG. Thus, neither from its particular composition nor from the observed melting-point depression of {ChCl + EG} mixtures can ethaline be considered a "deep eutectic solvent". Surprisingly, despite ChCl being an electrolyte dissolved in EG, the phase diagram is that of an ideal binary mixture.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHOLINE CHLORIDE; SOLVATION; LIQUID |
| 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: | 16 Feb 2024 05:23 |
| Last Modified: | 16 Feb 2024 05:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57836 |
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