Department of Analytical Chemistry, Medical University of Lublin, 20-093 Lublin, Poland.
Department of Process Engineering and Technology of Polymer and Carbon Materials, Faculty of Chemistry, Wrocław University of Science and Technology, 50-370 Wrocław, Poland.
Int J Mol Sci. 2020 Jun 15;21(12):4253. doi: 10.3390/ijms21124253.
Ionic liquids (ILs) are chemical compounds composed of ions with melting points below 100 °C exhibiting a design feature. ILs are commonly used as the so-called green solvents, reagents or highly efficient catalysts in varied chemical processes. The huge application potential of ionic liquids (IL) justifies the growing interest in these compounds. In the last decade, increasing attention has been devoted to the development of new methods in the synthesis of stable chiral ionic liquids (CILs) and their application in various separation techniques. The beginnings of the successful use of CILs to separate enantiomers date back to the 1990 s. Most chiral ILs are based on chiral cations or chiral anions. There is also a limited number of CILs possessing both a chiral cation and a chiral anion. Due to the high molecular diversity of both ions, of which at least one has a chiral center, we have the possibility to design a large variety of optically active structures, thus expanding the range of CIL applications. Research utilizing chiral ionic liquids only recently has become more popular. However, it is the area that still has great potential for future development. This review aimed to describe the diversity of structures, properties and examples of applications of chiral ionic liquids as new chiral solid materials and chiral components of the anisotropic environment, providing chiral recognition of enantiomeric analytes, which is useful in liquid chromatography, countercurrent chromatography and other various CIL-based extraction techniques including aqueous biphasic (ABS) extraction systems, solid-liquid two-phase systems, liquid-liquid extraction systems with hydrophilic CILs, liquid-liquid extraction systems with hydrophobic CILs, solid-phase extraction and induced-precipitation techniques developed in the recent years. The growing demand for pure enantiomers in the pharmaceutical and food industries sparks further development in the field of extraction and separation systems modified with CILs highlighting them as affordable and environmentally friendly both chiral selectors and solvents.
离子液体(ILs)是由熔点低于 100°C 的离子组成的化合物,具有设计特点。ILs 通常用作所谓的绿色溶剂、试剂或在各种化学过程中的高效催化剂。离子液体(IL)的巨大应用潜力证明了人们对这些化合物越来越感兴趣。在过去的十年中,人们越来越关注开发合成稳定手性离子液体(CILs)的新方法及其在各种分离技术中的应用。成功使用 CILs 分离对映异构体的开端可以追溯到 20 世纪 90 年代。大多数手性 ILs 基于手性阳离子或手性阴离子。也有数量有限的 CILs 同时具有手性阳离子和手性阴离子。由于两个离子(至少有一个具有手性中心)的分子多样性很高,我们有可能设计出各种各样的光学活性结构,从而扩大 CIL 的应用范围。利用手性离子液体的研究直到最近才变得更加流行。然而,它仍然是一个具有巨大发展潜力的领域。本综述旨在描述手性离子液体作为新型手性固体材料和各向异性环境中手性组成部分的结构、性质和应用实例的多样性,提供对手映体分析物的手性识别,这在手性液相色谱、逆流色谱和其他各种基于 CIL 的提取技术中很有用,包括两相双水相(ABS)萃取系统、亲水 CIL 的液-液萃取系统、疏水 CIL 的液-液萃取系统、固相萃取和近年来开发的诱导沉淀技术。制药和食品工业对纯对映异构体的需求不断增长,推动了 CIL 改性的提取和分离系统领域的进一步发展,突出了它们作为经济实惠且环境友好的手性选择剂和溶剂的地位。
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