Measurements of activity coefficients at infinite dilution for organic solutes and water in the ionic liquid 1-ethyl-3-methylimidazolium methanesulfonate
“…The activity coefficients at infinite dilution were determined using the GLC method previously presented in detail [23,[30][31][32][33]. Experiments were carried out using a PerkinElmer Clarus 500 gas chromatograph equipped with a heated on-column injector and a thermal conductivity detector (TCD γ were estimated by error propagation to be less than 3%.…”
Section: Apparatus and Experimental Proceduresmentioning
“…The activity coefficients at infinite dilution were determined using the GLC method previously presented in detail [23,[30][31][32][33]. Experiments were carried out using a PerkinElmer Clarus 500 gas chromatograph equipped with a heated on-column injector and a thermal conductivity detector (TCD γ were estimated by error propagation to be less than 3%.…”
Section: Apparatus and Experimental Proceduresmentioning
“…Using hygroscopic ILs as alternative absorbents might offer an option to avoid these specific disadvantages of glycols and could provide a simpler plant design. The affinity of ILs to water vapor is in some ILs significantly higher compared to TEG 17, 39–41. Furthermore, ILs usually have a relatively high thermal stability (160–300 °C) 14–16, which is substantially higher than for TEG 25.…”
Pyrene derivatives are among the most widely used organic fluorescent photoprobes. Many of them are photosensitizers for hole injection. Pyrenes, however, are mostly UV absorbers, limiting their utility for photonic applications. Nitration of pyrene shifts its absorption to the visible region. Conversely, nitration of pyrene that is already derivatized for covalent labeling, produces mixtures of isomers that are challenging to separate. We present a robust procedure for attaining isomerically pure nitropyrenes. NMR analysis provides unequivocal assign-
“…The lines are drawn to guide the eye Fig. 3 Selectivity, S 12 ∞ , at T = 328.15 K for ionic liquids based on [emim] + cation for separation: ( filled circle ) hexane/benzene [ 10 – 15 , 17 , 18 , 20 ]; ( empty circle ) cyclohexane/benzene [ 9 – 20 ], ( empty square ) heptane/thiophene [ 11 , 15 , 17 , 19 ]. The lines are drawn to guide the eye Fig.…”
New data of activity coefficients at infinite dilution, γ13∞, for 65 different solutes including alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, thiophene, ethers, ketones, aldehydes, esters and water in the ionic liquid 1-ethyl-3-methylimidazolium trifluorotris(perfluoroethyl)phosphate, were determined using inverse gas chromatography within the temperature range from 318.15 to 368.15 K. This is a continuation of our study of ionic liquids based on this anion. The results are compared with the other trifluorotris(perfluoroethyl)phosphate ionic liquids. The γ13∞ values were used to calculate thermodynamic functions such as partial molar excess Gibbs energies , enthalpies and entropies as well as gas–liquid partition coefficients of the solutes, KL. These values were used to determine the linear free energy relationship (LFER) system constants as a function of temperature. The selectivities at infinite dilution needed for some extraction problems were calculated and compared with literature data of ionic liquids based on the trifluorotris(perfluoroethyl)phosphate anion and the 1-ethyl-3-methylimidazolium cation. Additionally, the density and viscosity of the investigated ionic liquid at temperatures from 298.15 to 348.15 K were measured.Electronic supplementary materialThe online version of this article (doi:10.1007/s10953-014-0274-0) contains supplementary material, which is available to authorized users.
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