Eutectic solvents (ESs) are a relatively new class of solvents that have been arousing a lot of attention due to their easy preparation and great tunability of their thermophysical properties, which has been granting their application in a wide range of areas. The aim of this work is to present a new ES based on the mixture of an organic sodium salt, sodium hexanoate and dodecanoate, and a long alkyl chain carboxylic acid, octanoic, nonanoic, and decanoic acids, and to infer about the effect of introducing a sodium atom. The solid–liquid phase diagrams of these new sodium salt-based ES were determined to evaluate the liquid window where they can be confidently used as solvents. Other important properties of solvents have also been studied, and in particular, density and viscosity, at atmospheric pressure and in the temperature range between 293.15 and 353.15 K, were measured. In addition, the polarity of these new sodium salt-based deep eutectic solvents (DESs) was evaluated in terms of the Kamlet–Taft α, β, and π* and E_TN parameters. The obtained results were compared with those of other commonly used hydrophilic and hydrophobic DESs and conclusions were taken.

中文翻译：

---

己酸钠和十二酸钠盐基共晶溶剂：密度、粘度和 Kamlet-Taft 参数

共晶溶剂（ESs）是一类相对较新的溶剂，由于其易于制备和热物理性质的良好可调性而引起了很多关注，这使得它们在广泛的领域得到了应用。这项工作的目的是提出一种基于有机钠盐、己酸钠和十二烷酸钠以及长烷基链羧酸、辛酸、壬酸和癸酸的混合物的新 ES，并推断引入的效果一个钠原子。确定了这些新的钠盐基 ES 的固液相图，以评估它们可以可靠地用作溶剂的液体窗口。还研究了溶剂的其他重要特性，特别是在大气压和 293 之间的温度范围内的密度和粘度。测量了 15 和 353.15 K。此外，根据 Kamlet-Taft α、β 和 π* 和E _T N 参数。将获得的结果与其他常用的亲水性和疏水性DESs的结果进行比较并得出结论。