Synthesis, spectroscopic characterization and apparent molar properties of ethanolammonium based ionic liquids with DMSO

The density (ρ) and speed of sound (u) of binary solutions containing protic ionic liquids such as N‑butyl ethanolammonium acetate [NBEA][Ace] and N‑butyl ethanolammonium propionate [NBEA][Pro] with Dimethyl Sulfoxide (DMSO) were determined over a temperature range of (293.15 to 318.15) K at intervals of 5 K at 0.1 MPa pressure. The apparent molar volume (V_φ), isentropic compressibility (k_s) and apparent molar isentropic compressibility (k_s,φ) were estimated using the measured data. The apparent molar volume (V_φ^∞) and apparent molar isentropic compressibility (k_φ^∞) at infinite dilution, as well as the related empirical parameters (S_v, B_v, S_k and B_k), were calculated using the Redlich-Mayer type equation. The solute-solute and solute-solvent interactions are indicated by the obtained limiting apparent molar volume and limiting apparent molar isentropic compressibility. Furthermore, the apparent molar expansibility at infinite dilution was calculated using temperature dependent apparent molar volume at infinite dilution (E_φ^∞).