Ethylammonium alkanoate-based ionic liquid + water mixtures: A calorimetric and volumetric study at 298.15 K

摘要: A systematic study of a series room-temperature ionic liquids, belonging to the ethylammonium alkanoate family (EAX), was carried out at 298.15 K and 0.1 MPa with aim investigating effect anionic chain length on some thermophysical properties their behaviour in water (W), over whole mole fraction range. The determination Gutmann acceptor numbers for pure EAX by using 31P NMR spectroscopy allowed us obtain quantitative measure Lewis acidity. Experimental densities, ρ, were used calculate molar volumes, Vm, excess VE. Complementary information obtained isothermal titration calorimetry that provided values heat mixing, HE, partial enthalpies each component, \( \bar{H}_{1}^{E} \) \bar{H}_{2}^{E} \). density samples decrease as alkyl anion increases. Moderate negative VE HE found + W system, indicating presence attracting interactions between constituents.