Abstract
A series of seven novel thiazolium-based ionic liquids have been synthesized and characterized. To understand the physicochemical properties of thiazolium ionic liquids the compounds were characterized via thermogravimetric analysis, differential scanning calorimetry, and powder X-ray diffraction. The thiazolium sulfur atom is found to impart unique intermolecular interactions affecting the properties of the materials, both in the solid and liquid state. These interactions are examined by Hirshfeld surface analysis of single-crystal X-ray diffraction data as well as via variable-temperature viscometry. Further, it was observed that several of the ionic compounds exhibit high enthalpies of fusion making them potential candidates for thermal energy storage materials, expanding the possible applications for this class of compounds.
•Long-chain thiazolium ionic liquids display high enthalpies of crystallization•Solid-state analysis of the compounds show strong interactions arising from sulfur•Thermal stability of thiazolium ionic liquids is dependent on alkyl chain length•Intermolecular interactions in thiazolium compounds is similar to imidazolium salts