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1-Butyl-3-Methylimidazolium

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Jianji Wang – One of the best experts on this subject based on the ideXlab platform.

  • Effect of Substituent Groups in Anions on Some Physicochemical Properties of 1-Butyl-3-Methylimidazolium Carboxylate Ionic Liquids
    Journal of Chemical & Engineering Data, 2013
    Co-Authors: Yajuan Zhang, Jianji Wang
    Abstract:

    In this work, four 1-Butyl-3-Methylimidazolium carboxylate ionic liquids (ILs) with different substituent groups in anions, including 1-Butyl-3-Methylimidazolium glycollate [C4mim][HOCH2COO], 1-Butyl-3-Methylimidazolium lactate [C4mim][CH3CHOHCOO], 1-Butyl-3-Methylimidazolium benzoate [C4mim][C6H5COO], and 1-Butyl-3-Methylimidazolium glycinate [C4mim][H2NCH2COO], have been synthesized and characterized. Their densities (ρ) and surface tensions (γ) have been determined experimentally in the temperature range of (298.15 to 343.15) K. By using thermodynamic and empirical equations, molar volume (Vm), isobaric expansivity (αp), standard entropy (S°), lattice energy (UPOT), surface excess entropy (Ss), vaporization enthalpy (ΔlgHm0) and Hildebrand solubility parameter (δH) of these ILs have been derived from density and surface tension data. The effects of substituent groups in carboxylate anions on densities and surface tensions of these ILs have been assessed from the analysis of the structure–property relat…

  • Viscosities and Conductivities of 1-Butyl-3-Methylimidazolium Carboxylates Ionic Liquids at Different Temperatures
    Journal of Chemical & Engineering Data, 2012
    Co-Authors: Yajuan Zhang, Jianji Wang
    Abstract:

    In recent years, 1-Butyl-3-Methylimidazolium carboxylates ionic liquids (ILs) have been reported to be powerful solvents for the dissolution of cellulose and chitosan. However, very few studies have been conducted to investigate their basic physicochemical properties such as viscosity and conductivity. In this work, we have synthesized 1-Butyl-3-Methylimidazolium carboxylates ILs: 1-Butyl-3-Methylimidazolium formate ([C4mim][HCOO]), 1-Butyl-3-Methylimidazolium acetate ([C4mim][CH3COO]), 1-Butyl-3-Methylimidazolium propionate ([C4mim][CH3CH2COO]), and 1-Butyl-3-Methylimidazolium butyrate ([C4mim][CH3(CH2)2COO]), in which the alkyl chain length in the anions is varied. The experimental viscosities (η) and conductivities (σ) for these ILs have been determined at different temperatures, and well correlated by the Vogel–Fulcher–Tammann (VFT) equation. Walden plots indicate an increase in ion pairs and/or ionic aggregates in the ILs with increasing alkyl chain length. Furthermore, the effect of alkyl chain leng…

João A. P. Coutinho – One of the best experts on this subject based on the ideXlab platform.

  • Density and Viscosity Data for Binary Mixtures of 1-Alkyl-3-methylimidazolium Alkylsulfates + Water
    Journal of Chemical & Engineering Data, 2012
    Co-Authors: Arijit Bhattacharjee, Catarina Varanda, Mara G. Freire, Silvana Matted, Luís M. N. B. F. Santos, Isabel M. Marrucho, João A. P. Coutinho
    Abstract:

    Density and viscosity experimental data for binary mixtures of 1-alkyl-3-methylimidazolium alkylsulfates + water are reported using four ionic liquids: 1-Butyl-3-Methylimidazolium hydrogensulfate [C4mim][HSO4], 1-Butyl-3-Methylimidazolium methylsulfate [C4mim][C1SO4], 1-ethyl-3-methylimidazolium methylsulfate [C2mim][C1SO4], and 1-ethyl-3-methylimidazolium ethylsulfate [C2mim][C2SO4]. The choice of the ionic liquids allows us to compare the effects of incrementing the alkyl chain length in the cation and the anion on the measured thermophysical properties behavior. The Gardas and Coutinho group contribution methods were applied to the description of the pure component densities and viscosities allowing the estimation of new group contribution parameters, to extend the applicability of these methods to new ILs. Excess molar volumes and viscosity deviations were calculated and correlated by Redlich–Kister polynomial expansions.

  • on the spontaneous carboxylation of 1 butyl 3 methylimidazolium acetate by carbon dioxide
    Chemical Communications, 2012
    Co-Authors: M Besnard, João A. P. Coutinho, Isabel M Cabaco, Fabian Vaca Chavez, Noel Pinaud, P J Sebastiao, Y Danten
    Abstract:

    The formation of 1-Butyl-3-Methylimidazolium-2-carboxylate in the mixture of CO2 with 1-Butyl-3-Methylimidazolium acetate under mild conditions (298 K, 0.1 MPa) has been put in evidence in the liquid phase using Raman and infrared specspectroscopy complemented by DFT calculations and NMR (1H, 13C, 15N) spectroscopy.

  • High pressure phase behavior of carbon dioxide in 1-Butyl-3-Methylimidazolium bis(trifluoromethylsulfonyl)imide and 1-Butyl-3-Methylimidazolium dicyanamide ionic liquids
    The Journal of Supercritical Fluids, 2009
    Co-Authors: Pedro J. Carvalho, Isabel M. Marrucho, Víctor H. Álvarez, Martín Aznar, João A. P. Coutinho
    Abstract:

    Abstract The acidity/basicity of the reaction media has a substantial influence on the efficiency of many reactive processes; therefore, a new class of acidic or basic ionic liquids is gaining special attention due to the possibility of increasing the efficiency of many processes by a wise manipulation of their properties. The absorption of sour gases is one of the processes that can be enhanced by the basic character of the ionic liquid. The fluorination of the cation or anion can also contribute to the gas solubility enhancement. In this work, these two characteristics are evaluated and compared through the study of gas–liquid equilibrium of two ionic liquids, 1-Butyl-3-Methylimidazolium dicyanamide ([C4mim][DCA]) and 1-Butyl-3-Methylimidazolium bis(trifluoromethylsulfonyl)imide ([C4mim][Tf2N]), with carbon dioxide (CO2) at temperatures up to 363 K and pressures up to 74 MPa. A thermodynamic model based on the Peng–Robinson equation of state with the Wong–Sandler mixing rule, using the UNIQUAC model for the activity coefficients, was used to describe the experimental data and for the estimation of the Henry’s constants. The solubility of CO2 in 1-Butyl-3-Methylimidazolium dicyanamide is much lower than anticipated on the basis of the reported pKa of the anion when compared with the acetate anion. No chemisorption is observed and the solvation enthalpy is quite low, ruling out any Lewis acid/base interaction between the anion and the CO2. The 1-Butyl-3-Methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid, known to present one of the highest solubilities towards CO2 due to the presence of fluoroalkyl groups, showed a much larger solubility for CO2 than 1-Butyl-3-Methylimidazolium dicyanamide.

Huen Lee – One of the best experts on this subject based on the ideXlab platform.

Ki-sub Kim – One of the best experts on this subject based on the ideXlab platform.

Yajuan Zhang – One of the best experts on this subject based on the ideXlab platform.

  • Effect of Substituent Groups in Anions on Some Physicochemical Properties of 1-Butyl-3-Methylimidazolium Carboxylate Ionic Liquids
    Journal of Chemical & Engineering Data, 2013
    Co-Authors: Yajuan Zhang, Jianji Wang
    Abstract:

    In this work, four 1-Butyl-3-Methylimidazolium carboxylate ionic liquids (ILs) with different substituent groups in anions, including 1-Butyl-3-Methylimidazolium glycollate [C4mim][HOCH2COO], 1-Butyl-3-Methylimidazolium lactate [C4mim][CH3CHOHCOO], 1-Butyl-3-Methylimidazolium benzoate [C4mim][C6H5COO], and 1-Butyl-3-Methylimidazolium glycinate [C4mim][H2NCH2COO], have been synthesized and characterized. Their densities (ρ) and surface tensions (γ) have been determined experimentally in the temperature range of (298.15 to 343.15) K. By using thermodynamic and empirical equations, molar volume (Vm), isobaric expansivity (αp), standard entropy (S°), lattice energy (UPOT), surface excess entropy (Ss), vaporization enthalpy (ΔlgHm0) and Hildebrand solubility parameter (δH) of these ILs have been derived from density and surface tension data. The effects of substituent groups in carboxylate anions on densities and surface tensions of these ILs have been assessed from the analysis of the structure–property relat…

  • Viscosities and Conductivities of 1-Butyl-3-Methylimidazolium Carboxylates Ionic Liquids at Different Temperatures
    Journal of Chemical & Engineering Data, 2012
    Co-Authors: Yajuan Zhang, Jianji Wang
    Abstract:

    In recent years, 1-Butyl-3-Methylimidazolium carboxylates ionic liquids (ILs) have been reported to be powerful solvents for the dissolution of cellulose and chitosan. However, very few studies have been conducted to investigate their basic physicochemical properties such as viscosity and conductivity. In this work, we have synthesized 1-Butyl-3-Methylimidazolium carboxylates ILs: 1-Butyl-3-Methylimidazolium formate ([C4mim][HCOO]), 1-Butyl-3-Methylimidazolium acetate ([C4mim][CH3COO]), 1-Butyl-3-Methylimidazolium propionate ([C4mim][CH3CH2COO]), and 1-Butyl-3-Methylimidazolium butyrate ([C4mim][CH3(CH2)2COO]), in which the alkyl chain length in the anions is varied. The experimental viscosities (η) and conductivities (σ) for these ILs have been determined at different temperatures, and well correlated by the Vogel–Fulcher–Tammann (VFT) equation. Walden plots indicate an increase in ion pairs and/or ionic aggregates in the ILs with increasing alkyl chain length. Furthermore, the effect of alkyl chain leng…