Structure-Property Relationship for 1-Isopropyl-3-methylimidazolium- and 1-tert-Butyl-3-methylimidazolium-Based Ionic Liquids: Thermal Properties, Densities, Viscosities, and Quantum Chemical Calculations Endo, T.; Sakaguchi, K.; Higashihara, K.; Kimura, Y.; Journal of Chemical & Engineering Data 2019, 64, 5857-5868