Abstract
Ether-based functionalized amino acid ionic liquids have the advantages of its unique Contribution to low viscosity and high conductivity, as well as the biodegradability of amino acids. Three kinds of ether-based functionalized amino acid ionic liquids 1-(4-methoxybutyl)-3-methylimidazolium glycine ([COC4mim][Gly]), 1-(4-methoxybutyl)-3-methylimidazolium alanine ([COC4mim][Ala]) and 1-(4-methoxybutyl)-3-methylimidazolium threonine ([COC4mim][Thr]) were synthesized. And physicochemical properties, including density, surface tension and refraction, were measured at different experimental conditions. Based on the polarity scale of ionic liquids proposed by Hildebrand theory, an equation of the polarity coefficient Py was proposed. And we found that it can be applied into the determination of polarity for both ionic liquids and molecular liquids. The surface tension of [COC4mim][Gly], [COC4mim][Ala] and [COC4mim][Thr] was estimated by the definitions of the molar surface Gibbs energy and molar refraction. The predicted values γ(pre) have a very high linear correlation with the corresponding experimental ones.
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