Influence of the cation partner on levulinate ionic liquids properties

In the context of bio-based ionic liquids (ILs), in recent years levulinate ILs have been explored various applications with appreciable performances. To expand their scope use, seven selected featuring different cationic moieties prepared and physico-chemical properties compared. While all generated displayed only glass transitions at low temperature (<−60 °C), [C4C1Pyr]Lev presented melting crystallization events. The thermal stability determined by TGA decreased order [P8881]Lev > [C2C1Im]Lev ≈ [C4C1Im]Lev [C2C1Pip]Lev [C2C1Pyr]Lev [N8881]Lev, is good agreement general trend observed for carboxylate ILs. terms viscosity, LevILs showed a Newtonian behaviour when considering shearing rates range, marked reduction viscosity increasing temperatures. glassy was further ascertained applying MYEGA viscosity-based model determination fragility index. density found to vary vicinity 1g/cm3, systematic refractive index increase identified as trend. experimentally five wavelengths several temperatures between 80 °C 130 followed [N8881]Lev. Overall, possibility tune through structural variations part has proven valid LevIL family. When compared described literature, show great potential applicative studies.