Excess Heat Capacities of Binary and Ternary Mixtures Containing 1-Ethyl-3-methylimidazolium Tetrafluoroborate and Anilines

Abstract

The excess heat capacities (C P E)123 of 1-ethyl-3-methylimidazolium tetrafluoroborate (1) + 2-methylaniline (2) + aniline or N-methylaniline (3) ternary mixtures and C P E of their sub-binaries 1-ethyl-3-methylimidazolium tetrafluoroborate (1) + aniline or 2-methylaniline or N-methylaniline (2) and 2-methylaniline (1) + aniline or N-methylaniline (2) have been measured as a function of composition at (293.15, 298.15, 303.15, and 308.15) K. While the C P E values of 1-ethyl-3-methylimidazolium tetrafluoroborate (1) + aniline or 2-methylaniline or N-methylaniline (2) mixtures are negative, those for 2-methylaniline (1) + aniline or N-methylaniline (2) are positive over the entire composition range. Furthermore, the (C P E)123 values of the ternary mixtures are negative over the full range of composition. The connectivity parameters of third degree for the constituent molecules, 3ξ, which in turn deal with their topology (graph theory), have been employed to determine the C P E and (C P E)123 data of the present binary and ternary mixtures. The results indicate that the C P E and (C P E)123 values predicted by graph theory are in agreement with experimental values.

Speed of Sound and Ultrasound Absorption in Ionic Liquids

“…The database included papers in which experimental speed of sound data were reported for temperatures from 278.15 to 393.15 K and pressures from 0.1 to 200 MPa (142 articles), a paper in which experimental data are presented only as a plot (1 article), and works where only calculated values of speed of sound are available (22 articles) published in the period 2004–2014 (Table S1). ,,− ,− ,− ,,,,,− …”

“…A detailed analysis of literature data for five ILs, namely [C 2 C 1 im]­[BF 4 ], [C 4 C 1 im]­[BF 4 ], [C 4 C 1 im]­[PF 6 ], [C 4 C 1 im]­[NTf 2 ], and [C 6 C 1 im]­[NTf 2 ], was presented as examples in order to show real difficulties and problems with consistency of speed of sound data sets. For [C 2 C 1 im]­[BF 4 ] among 12 papers, − published up to 2014, in 11 there are identical data sets, in some cases differing in decimal places (i.e., one or two); only data reported by Sharma et al are different; however, they did not compare these results with their own data reported in other papers. Therefore, finally, the analysis of consistency of speed of sound data was presented for four ILs, i.e., [C 6 C 1 im]­[NTf 2 ] ,,,, as a substance recommended by IUPAC, [C 4 C 1 im]­[BF 4 ], [C 4 C 1 im]­[PF 6 ], as well as for [C 4 C 1 im]­[NTf 2 ]. ,,,,,,,, The purity of these ILs is compared in Table .…”

Thermodynamic and theoretical study on hydrogen bonded binary mixtures of isomeric butanols with o-toluidine at T=(303.15 to 318.15) K

“…The mass fraction purities were tested by gas chromatography and are given in Table 1. The purity of the solvents is ascertained by comparing the experimental values of density, viscosity and speed of sound with those reported in the literature at T = (303.15 to 318.15) K with the literature [20][21][22][23] (shown in Table 2). …”

Density, Speed of Sound, and Dynamic Viscosity of 1-Butyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide/1-Butyl-3-methylimidazolium Hexafluorophosphate and N-Methylaniline Binary Systems from T = 298.15 to 323.15 K at 0.1 MPa

“…The information regarding the technical details of apparatus was discussed in detail in our earlier work . The values of basic experimental data of pure chemicals and the available data of NIST ThermoLit for the studied temperatures are shown in Table . − ,− …”