The ionic parachor and predicting properties of amino acid ionic liquid homologues of 1-alkyl-3-methylimidazolium glycine  

作　　者：TONG Jing HONG Mei WANG PanPan GUAN Wei FANG DaWei YANG JiaZhen 

机构地区：[1]Key Laboratory qf Green Synthesis and Preparative Chemistry of Advanced Materials,Liaoning University,Shenyang 110036,China

出　　处：《Science China Chemistry》2012年第7期1330-1337,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation ofChina (20903053);the Education Bureau of Liaoning Province(LS2010069);Liaoning University Research Funding

摘　　要：The amino acid ionic liquids （AAILs） [C3mim][Gly] （1-propyl-3-methylimidazolium glycine） and [C4mim][Gly] （l-butyl-3- methylimidazolium glycine） have been prepared by the neutralization method and characterized by IH NMR spectroscopy and differential scanning calorimetry （DSC）. The values of their density, surface tension and refractive index were measured at （298.15 ± 0.05） K. Since the AAILs can form strong hydrogen bonds with water, small amounts of water are difficult to remove from the AAILs by common methods. In order to eliminate the effect of the impurity water, the standard addition method （SAM） was applied to these measurements. A new concept which is called the ionic parachor has been put forward. The [Cn mim]＋ cations were treated as a group of reference ions and the individual values of their ionic parachor were evaluated in terms of an extrathermodynamic assumption. Then, using the values of the ionic parachor of reference ions, the parachor, surface tension y and refractive index no of the ionic liquids investigated in this work were estimated. The estimated values correlate quite well with the corresponding experimental values.The amino acid ionic liquids(AAILs) [C3mim][Gly](1-propyl-3-methylimidazolium glycine) and [C4mim][Gly](1-butyl-3methylimidazolium glycine) have been prepared by the neutralization method and characterized by 1 H NMR spectroscopy and differential scanning calorimetry(DSC).The values of their density,surface tension and refractive index were measured at(298.15 ± 0.05) K.Since the AAILs can form strong hydrogen bonds with water,small amounts of water are difficult to remove from the AAILs by common methods.In order to eliminate the effect of the impurity water,the standard addition method(SAM) was applied to these measurements.A new concept which is called the ionic parachor has been put forward.The [C n mim] + cations were treated as a group of reference ions and the individual values of their ionic parachor were evaluated in terms of an extrathermodynamic assumption.Then,using the values of the ionic parachor of reference ions,the parachor,surface tension γ and refractive index n D of the ionic liquids investigated in this work were estimated.The estimated values correlate quite well with the corresponding experimental values.

关 键 词：ionic liquids ionic parachor GLYCINE density surface tension extrathermodynamic assumption 

分 类 号：O646.1[理学—物理化学] TQ226.36[理学—化学]