Volumetric and Speed of Sound of Ionic Liquid, 1-Butyl-3-methylimidazolium Hexafluorophosphate with Acetonitrile and Methanol at T = (298.15 to 318.15) K

Abstract

We report the density (ρ) and speed of sound (u) data for 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) + methanol and ([BMIM][PF6]) + acetonitrile binary mixtures over the entire range of their compositions at T = (298.15 to 318.15) K. From these data, excess molar volume and isentropic compressibility deviation values have been calculated and fitted to the fourth-order Redlich−Kister equation. The excess molar volume values (V E) for acetonitrile mixtures are more negative than methanol mixtures. Isentropic compressibility deviation values (Δκs) in methanol mixtures are more than acetonitrile mixtures. The results have been interpreted in terms of ion−dipole interactions and structural factors of the ionic liquid and these organic solvents.

Application of Prigogine–Flory–Patterson theory to excess molar volume and speed of sound of 1-n-butyl-3-methylimidazolium hexafluorophosphate or 1-n-butyl-3-methylimidazolium tetrafluoroborate in methanol and acetonitrile

“…The temperature was automatically kept constant within ±1.0 AE 10 À3 K. In each measurement, the precision of density and speed of sound were ±3.0 AE 10 À6 g AE cm À3 and ±0.1 m AE s À1 , respectively. In the case of systems containing [BMIM][PF 6 ] in (methanol + acetonitrile) mixtures, density and speed of sound data have been reported previously [32]. Density and speed of sound values of the pure components are given in table 1 at 298.15 K and compared with the literature values.…”

Non-ideal behaviour of a room temperature ionic liquid in an alkoxyethanol or poly ethers at T=(298.15 to 318.15)K

“…Synthesis grade ethylene glycol monomethyl ether (>99.5 mol%), ethylene glycol dimethyl ether (>99 mol%), diethylene glycol dimethyl ether (>99 mol%), were obtained from Merck-Schuchardt, and were used without further purification. Purity of the compounds was also checked by comparing density and refractive index values with the literature values at 298.15 K in table 1 [8,15,[22][23][24][25][26][27][28][29][30][34][35][36]. All samples were kept in tightly sealed dark bottles to minimize the absorption of atmospheric moisture and CO 2 , and dried over 0.4 nm molecular sieves before use.…”

“…Its thermo-physical properties [7][8][9][10], (solid + liquid) and (liquid + liquid) equilibria in aqueous or non-aqueous solvents [11][12][13], solubility in hydrocarbons [14] and thermodynamic mixing properties with some molecular organic solvents [15][16][17][18][19][20][21] have been reported. In this paper, we present the density and refractive index measurements for the binary mixtures of [bmim][PF 6 ] with ethylene glycol monomethyl ether (EGMME), ethylene glycol dimethyl ether (EGDME) and diethylene glycol dimethyl ether (DEGDME) over the whole composition range at constant temperatures.…”

Volumetric and Isentropic Compressibility Behavior of Ionic Liquid, 1-Propyl-3-Methylimidazolium Bromide in Acetonitrile, Dimethylformamide, and Dimethylsulfoxide at T = (288.15 to 308.15) K

“…The chosen solvents, MeCN, DMF, and DMSO, are versatile compounds, especially in their wide range of applicability as solvents in chemical and technological processes and are inexpensive and easily available at high purity. The calculated quantities can be used in a qualitatively or quantitatively way to provide information about molecular structure and the nature of intermolecular forces in these kinds of liquid mixtures [32,33].…”