Volumetric, ultrasonic and spectroscopic studies of molecular interactions in binary mixtures of 1-butyl-3-methylimidazolium hexafluorophosphate with 2-propoxyethanol at temperatures from 298.15 to 323.15 K

The thermophysical properties, viz., densities, ρ, ultrasonic speeds, u, viscosities, η, and refractive indices, n D, were measured for the binary liquid mixtures of 1-butyl-3-methylimidazolium tetrafluoroborate [Bmim][BF4] with N-methylacetamide [NMA] over the whole concentration range, including those of pure liquids, at temperatures T/K = 293.15–318.15 and at pressure p = 101 kPa. Experimental data were used to determine the excess molar volume, V m E, excess isentropic compressibility, κs E, excess speed of sound, u E, excess molar isentropic compressibility, K s, m E, deviations in viscosity Δη, and deviations in refractive index, Δϕ n D. These parameters were fitted to the Redlich–Kister type polynomial equation. The partial molar volumes and partial molar compressibilities and excess partial molar volumes and excess partial molar compressibilities over the entire range of mole fraction and at infinite dilution were also determined. The observed negative values of V m E, κs E, K s, m E, and Δη and positive values u Eand Δϕ n D indicate the strong interactions between the component molecules of these mixtures.

Section: Resultssupporting

confidence: 90%

Densities, Ultrasonic Speeds, Viscosities, Refractive Indices, and Excess Properties of 1-Butyl-3-methylimidazolium Tetrafluoroborate + N-Methylacetamide Binary Mixtures at Different Temperatures

Chaudhary

Nain

2020

“…Relative deviations between c exp values obtained in this work (eq ) and reported values in the literature c lit shown as ( c lit – c exp )/ c exp in the temperature range from 293.15 to 343.15 K for (a) [C 4 C 1 im][PF 6 ]: ●, ref ; □, ref ; Δ, ref ; ×, ref ; and ○, ref . (b) [C 6 C 1 im][PF 6 ]: ○, ref ; □, ref ; ▲, ref ; and ×, ref .…”

Section: Methodsmentioning

confidence: 66%

Influence of Temperature, Anions, and Alkyl Chain Length on the Density, Viscosity, Speed of Sound, Surface Tension, and Refractive Index of Imidazolium Hexafluorophosphate-Based Ionic Liquids

Aljasmi,

AlJimaz,

AlKhaldi

et al. 2024

The densities, refractive indices, viscosities, surface tensions, and speed of sound of [C n eim][PF6] (n = 3, 4) and [C n mim][PF6] (n = 4, 5, 6, 7, 8, 9) were experimentally determined and analyzed at temperatures ranging from 293.15 to 343.15 K, under atmospheric pressure conditions. All of the properties decrease as the temperature increases, as expected, with viscosity being the most influenced by the temperature change. The density, speed of sound, surface tension, and refractive index are estimated by using linear correlation as a function of temperature, whereas viscosity is correlated by using the well-known Vogel–Fulcher–Tammann (VFT) equation. The corresponding coefficients of thermal expansion were determined by using the experimental density data. Moreover, the Laplace–Newton equation was used to calculate the isentropic compressibility. Furthermore, the influence of anion type and alkyl chains on the thermophysical properties of the studied ionic liquids is studied. Based on the findings, the physical properties of the investigated ionic liquids are greatly influenced by the nature of the anion, while the alkyl chain has less significance. As the alkyl chain length increases, the density, speed of sound, and surface tension all decrease. Viscosity and refractive index, on the other hand, exhibit diametrically opposed behavior. Furthermore, a comparison between theoretical models for density, surface tension, speed of sound, and experimental values obtained from this work is discussed.

“… a Standard uncertainties u are u (ρ) = 0.15 kg m –3 , u ( u ) = 1.5 m s –1 , u ( T ) = 0.01 K, and u ( P ) = 1.0 kPa. b Yao et al c Anwar et al d Bansal et al e Gonzalez et al f Srilakshmi et al g Reddy et al h Krishna et al I Reddy et al j Gonzalez et al k Aangothu et al …”

Section: Experimental Partmentioning

confidence: 99%

Volumetric, Ultrasonic, Spectroscopic, and Molecular Dynamics Simulations Studies of Molecular Interactions in Binary Mixtures of [Emim][NTf₂] with 2-Propoxyethanol at Temperatures from 298.15 to 318.15 K

Prathipati

Aangothu

Reddy³

et al. 2020

To know the molecular interaction pattern between the IL 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [Emim][NTf2], and organic solvent 2-propoxyethanol (2-PE), a detailed thermophysical study was conducted at a temperature range of 298.15–318.15 K, over the whole composition range of the mixture and atmospheric pressure. Further, the excess parameters like excess molar volume (V m E), excess isentropic compressibility (κs E), excess isobaric thermal expansion coefficient (αP E), deviation in refractive index (Δ⌀ n D), and partial molar quantities are obtained from the experimental values. To confirm the excess parameters obtained from the experimental values, these were checked with Redlich–Kister polynomial type equation. It was observed that in the binary system of [Emim][NTf2] and [2-PE] there are strong attractive forces at the IL-rich region. Finally, the microscopic interactions were also confirmed with ATR-FTIR spectra and molecular dynamics simulation studies.