Thermal, dielectric, and electrochemical study of decanoic acid–tetrabutylammonium chloride deep eutectic solvent

A mixture based on decanoic acid (DA) and tetrabutylammonium chloride (TBACl) is a simple and prototypical deep eutectic solvent (DES) useful for extracting compounds that are poorly soluble in water or in electrochemical applications. The most widely studied composition is DA–TBACl with a molar ratio equal to 2:1. The composition of DESs has a strong impact on their physicochemical properties. Herein, a comparative study of thermal, dielectric, and ionic conductivities and electrochemical properties of DA–TBACl is carried out with varying molar compositions 2:1, 1:1, and 1:2. All the molar compositions lead to a stable fluid whose properties depend on the composition, providing better understanding and further insights into the chemical interactions that prevail in those materials.