Volumetric properties of ammonium-based salts in N,N- Dimethylformamide over the temperature range 298.15 K to 348.15 K

Density of solutions of protic ionic liquids diethylammonium trifluoromethanesulfonate and triethylam-monium trifluoromethanesulfonate and salt tetraethylammonium trifluoromethanesulfonate in N,N-dimethylformamide (DMF) was measured at T = (298.15-348.15) K and atmospheric pressure (p = 0.101 MPa). Apparent molar volumes calculated on the basis of these measurements were approx-imated by Redlich-Mayer and Mason equations. Standard partial molar volumes (V-0) of salts were divided into ionic components (V-i(0)) from which, by using the values of intrinsic volume of the ion, volu-metric solvation parameters (Delta V-i(0)) were calculated. On the basis of the volumetric characteristics obtained, the ion-solvent interaction is discussed. The limiting volumetric properties were compared with the properties of a series of tetraethylammonium ([H(CH2)(n)](4)N+, n = 3-7) cations in DMF. (C) 2020 Elsevier Ltd.

Automated summary

The study investigated the solubility of protic ionic liquids diethylammonium trifluoromethanesulfonate and triethylammonium trifluoromethanesulfonate, as well as the salt tetraethylammonium trifluoromethanesulfonate in the solvent N,N-dimethylformamide (DMF) at different temperatures and atmospheric pressures. By analyzing the calculated apparent molar volumes and ionic components, the ion-solvent interactions and their effects were discussed, along with comparisons to a series of tetraethylammonium cations in DMF.