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Density, refractive index, and viscosity of binary systems composed of ionic liquids ([Cnmim]Cl, n = 2, 4) and three dipolar aprotic solvents at T = 288.15–318.15 K

Lu Bai, Shu-Ni Li, Quan-Guo Zhai, Yu-Cheng Jiang, and Man-Cheng Hu

School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an, Shaanxi, 710062, China

 

E-mail: lishuni@snnu.edu.cn

Abstract: Thermophysical properties, such as density (ρ), refractive index (nD), and viscosity (η) of the binary systems of ionic liquids (ILs) [Cnmim]Cl (Cnmim = 1-alkyl-3-methylimidazolium; n = 2, 4) and three dipolar aprotic solvents (NMP (N-methyl-2-pyrrolidinone), DMI (1,3-dimethyl- 2-imidazolidinone), and DMPU (1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone)) were measured based on the solubility of ILs in the molecular solvents at temperatures from 288.15 K to 318.15 K and the pressure of p = 0.1 MPa. Moreover, intermolecular interactions, such as weak hydrogen bonding and Coulomb forces, were discussed based on the determined properties.

Keywords: imidazolium-based ionic liquids – dipolar aprotic solvents – density – refractive index – viscosity

Full paper is available at www.springerlink.com.

DOI: 10.1515/chempap-2015-0139

 

Chemical Papers 69 (10) 1378–1388 (2015)

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