Prediction of Physicochemical Properties of Valine Ionic Liquids [Cnmim][Val] (n = 2, 3, 4, 5, 6) by Empirical Methods: 2

• DOI: 10.1021/ie201530b
• Publication Date: 2012-02-23T22:46:16Z
• Authors: Wei-Guo Xu; Xiao-Xue Ma; Long Li; Jing Tong; Wei Guan
• Keywords: 01 natural sciences; 0104 chemical sciences

A new ionic liquid [C3mim][Val] (1-propyl-3-methylimidazolium valine) was synthesized and characterized by 1H NMR. To avoid the influence of trace water in (IL), standard addition method (SAM) employed; density surface tension were determined over temperature range 303.15–333.15 K (±0.05 K). The experimental density, tension, parachor values at 298.15 are good agreement with that predicted Tong et al. [J. al., Ind. Eng. Chem. Res.2011, 50, 2418–2423]. Based on data for [C3mim][Val], a series physicochemical properties—the molecular volume (Vm), (γ), refractive index (nD), molar enthalpy vaporization (ΔlgHm0), thermal expansion coefficient (α) values, entropy (S0), polarization (Rm)—for homologue [Cnmim][Val] (n = 2, 4, 5, 6) estimated using empirical methods. results consistent one Tong's estimations, terms [C2mim][Val].