Study on physicochemical properties of ionic liquids based on alanine [Cnmim][Ala] (n=2,3,4,5,6)
Study on physicochemical properties of ionic liquids based on alanine [Cnmim][Ala] (n=2,3,4,5,6)
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DOI：
10.1021/jp801269u
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发表时间：
2008-06-26
影响因子：
3.3
通讯作者：
Yang, Jia-Zhen
中科院分区：
文献类型：
--
作者：
Fang, Da-Wei;Guan, Wei;Yang, Jia-Zhen
根据Fukumoto的方法，制备了由1-烷基-3-甲基咪唑阳离子([C（n)mim](+)）和丙氨酸阴离子（[Ala](-)）组成的新型丙氨酸离子液体[C(n)mim][Ala] （n = 2,3,4,5,6）。采用标准加成法，在293.15 ~ 343.15 +/- 0.05 K的温度范围内测定了氨基酸ILs [C(n)mim][Ala]（1-烷基-3-甲基咪唑α -氨基丙酸盐）的密度和表面张力。讨论了il [C(n)mim][Ala]的体积和表面性质。提出了一种测定离子化合物降落伞的新方法，并将其应用于氨基酸离子液体（AAILs）的理化性质：分子体积、表面张力、摩尔蒸发焓和热膨胀系数。与Deetlefs使用中性降落伞贡献的方法相比，本文提出的方法在估计aail性质时误差更小。
According to Fukumoto's method, a new series of ionic liquids (ILs) based on alanine, [C(n)mim][Ala] (n = 2,3,4,5,6), which comprise 1-alkyl-3-methylimidazolium cation ([C(n)mim](+)) and alanine anions ([Ala](-)), were prepared and characterized. In terms of standard addition method, the density and surface tension of amino acid ILs [C(n)mim][Ala] (1-alkyl-3-methylimidazolium alpha-aminopropionic acid salt) were measured in the temperature range 293.15-343.15 +/- 0.05 K. The volume and surface properties of the ILs [C(n)mim][Ala] were discussed. A new method of determining parachor of ionic compound was proposed and was applied to estimate the physicochemical properties of amino acid ionic liquids (AAILs): molecular volume, surface tension, molar enthalpy of vaporization, and thermal expansion coefficient. In comparison with Deetlefs's method of using neutral parachor contribution, the method proposed in this work makes smaller error in estimating properties of AAILs.