胆碱氯化物和乙二醇混合物的共晶点。

Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK.

Chem Commun (Camb). 2022 Nov 15;58(91):12728-12731. doi: 10.1039/d2cc04008e.

The choline chloride (ChCl) and ethylene glycol (EG) mixture has become established as a paradigmatic deep eutectic solvent (DES). Here, we present measurements of the phase behaviour of this mixture over a wide composition range, and provide an extended phase diagram. The eutectic point was found to lie at -28 ± 1 °C and 0.01 < < 0.02, sharply contrasting with the previously expected eutectic composition. Our observations confirm that the eutectic temperature is not 'deep' compared to the ideal solution theory prediction. We also observe a cold-crystallisation at = -65 °C which may have been formerly misinterpreted as the eutectic point.

氯化胆碱（ChCl）和乙二醇（EG）的混合物已成为典型的深共晶溶剂（DES）。在这里，我们在很宽的组成范围内测量了该混合物的相行为，并提供了扩展的相图。共晶点位于-28±1°C 和 0.01 < < 0.02，与之前预期的共晶组成形成鲜明对比。我们的观察结果证实，与理想溶液理论预测相比，共晶温度并不“深”。我们还观察到在 = -65°C 时的冷结晶，这可能以前被错误地解释为共晶点。