Journal
JOURNAL OF CHEMICAL THERMODYNAMICS
Volume 155, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2020.106371
Keywords
Partial molar volumes; Protic ionic liquids; N,N-dimethylformamide
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Funding
- Russian Foundation for Basic Research [19-03-00505]
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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.
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.
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