Density, refractive index, and viscosity of binary systems composed of ionic liquids ([Cnmim]Cl, n = 2, 4) and three dipolar aprotic solvents at T = 288.15–318.15 K

Thermophysical properties, such as density (ρ), refractive index (nD), and viscosity (η) of the binary systems of ionic liquids (ILs) [Cnmim]Cl (Cnmim = 1-alkyl-3-methylimidazolium; n = 2, 4) and three dipolar aprotic solvents (NMP (N-methyl-2-pyrrolidinone), DMI (1,3-dimethyl-2-imidazolidinone), and DMPU (1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone)) were measured based on the solubility of ILs in the molecular solvents at temperatures from 288.15 K to 318.15 K and the pressure of p = 0.1 MPa. Moreover, intermolecular interactions, such as weak hydrogen bonding and Coulomb forces, were discussed based on the determined properties.