Citation: HOU Hai-Yun, HUANG Yin-Rong, WANG Sheng-Ze, BAI Bo-Feng. Preparation and Physicochemical Properties of Imidazolium Acetates and the Conductivities of Their Aqueous and Ethanol Solutions[J]. Acta Physico-Chimica Sinica, ;2011, 27(11): 2512-2520. doi: 10.3866/PKU.WHXB20111120 shu

Preparation and Physicochemical Properties of Imidazolium Acetates and the Conductivities of Their Aqueous and Ethanol Solutions

1.
1. College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an 710048, P. R. China;
2. State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China

Received Date: 29 July 2011
Available Online: 7 September 2011
Fund Project: 西安工程大学科研启动基金(BS0704) (BS0704)西安工程大学研究生创新基金(chx110944)资助项目 (chx110944)

The ionic liquids 1-methylimidazolium acetate ([Mim]Ac), 1,3-dimethylimidazolium acetate ([Mmim]Ac), and 1-ethyl-3-methylimidazolium acetate ([Emim]Ac) were prepared and their densities, conductivities, and absolute viscosities were measured at temperatures ranging from 293.15 to 338.14 K. Their corresponding molar conductivities and kinematic viscosities were also calculated. The dependence of densities, conductivities, molar conductivities, absolute viscosities, and kinematic viscosities on temperature were obtained using the least-squares method. The influence of the alkyl chains at the 3-position N atom of the imidazole ring on the above five physicochemical properties of these imidazolium acetates were discussed. The conductivities of binary solutions of [Mim]Ac {or [Mmim]Ac or [Emim]Ac} (1)- H₂O (or EtOH) (2) were measured for a full set of mole fractions and the corresponding molar conductivities of the three imidazolium acetates in the six binary solutions were also calculated. In water and ethanol solutions we found that the conductivities and the molar conductivities increased initially and then decreased with an increase in the mole fraction of the imidazolium acetates. At the same concentration a longer alkyl chain at the 3-position of the imidazole ring resulted in higher conductivity and molar conductivity for the imidazolium acetates. Furthermore, the conductivities and molar conductivities of the aqueous solutions are always far higher than those of ethanol solutions.
- Imidazolium acetate,
- Density,
- Viscosity,
- Conductivity,
- Molar conductivity,
- Binary solution
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