Examination of ionic liquids and their interaction with molecules, when used as stationary phases in gas chromatography
Examination of ionic liquids and their interaction with molecules, when used as stationary phases in gas chromatography
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DOI：
10.1021/ac990443p
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发表时间：
1999-09-01
影响因子：
7.4
通讯作者：
Liu, YS
中科院分区：
文献类型：
--
作者：
Armstrong, DW;He, LF;Liu, YS
稳定的室温离子液体（RTILs）被用作新型反应溶剂。它们可以溶解复杂的极性分子，如环糊精和糖肽。它们的润湿能力和粘度允许它们被涂在熔融二氧化硅毛细管上。因此，1-丁基-3-甲基咪唑六氟磷酸和类似的氯盐可以用作气相色谱（GC）的固定相，使用反相GC，可以通过它们与各种化合物的相互作用来检查这些离子液体的性质。测定了离子液体和一种常用的商业聚硅氧烷固定相的罗尔施耐德-麦克雷诺常数。离子液体固定相似乎具有双重性质。它们对非极性化合物起低极性固定相的作用。然而，特别是具有强质子供体基团的分子，会被顽强地保留下来。阴离子的性质对离子液体固定相的增溶能力和选择性都有显著影响。离子液体的不同寻常的性质似乎使它们在分离科学的许多领域都很有用。
Stable room-temperature ionic liquids (RTILs) have been used as novel reaction solvents. They can solubilize complex,polar molecules such as cyclodextrins and glycopeptides. Their wetting ability and viscosity allow them to be coated onto fused silica capillaries. Thus, 1-butyl-3-methylimidazolium hexafluorophosphate and the analogous chloride salt can be used as stationary phases for gas chromatography (GC), Using inverse GC, one can examine the: nature of these ionic liquids via their interactions with a variety of compounds. The Rohrschneider-McReynolds constants were determined for both ionic liquids and a popular commercial polysiloxane stationary phase. Ionic liquid stationary phases seem to have a dual nature. They appear to act as a low-polarity stationary phase to nonpolar compounds. However, molecules with strong proton donor groups, in particular, are tenaciously retained. The nature of the anion can have a significant effect on both the solubilizing ability and the selectivity of ionic liquid stationary phases. It appears that the unusual properties of ionic liquids could make them beneficial in many areas of separation science.