PEG-linked geminal dicationic ionic liquids as selective, high-stability gas chromatographic stationary phases

Abstract

It is known that room-temperature ionic liquids (RTILs) have wide applicability in many scientific and technological fields. In this work, a series of three new dicationic room-temperature ionic liquids functionalized with poly(ethylene glycol) (PEG) linkages were synthesized and characterized via a linear solvation model. The application of these ILs as new GC stationary phases was studied. The efficient separation of several mixtures containing compounds of different polarities and 24 components of a flavor and fragrance mixture indicated comparable or higher resolving power for the new IL stationary phases compared to the commercial polysiloxane and poly(ethylene glycol)-based stationary phases. In addition, the selectivities of the IL stationary phases could be quite unique. The separation of a homologous alkane and alcohol mixture displayed the "dual nature" of these ionic liquids as GC stationary phases. The thermal stability study showed the column robustness up to 350 degrees C. The high separation power, unique selectivity, high efficiency and high thermal stability of the new dicationic ionic liquids indicate that they may be applicable as a new type of robust GC stationary phase.

Evaluation of dicationic reagents for their use in detection of anions using positive ion mode ESI-MS via gas phase ion association

“…The purpose of this study is to examine the effects of using a variety of different types and structures of dication reagents, and to determine whether or not their selectivity, sensitivity, and efficacy vary for different anions. Our previous efforts included extensive research in developing dicationic compounds [21][22][23][24]. Originally synthesized as ultra-stable ionic liquids [21], this research has led to the development of a wide array of dicationic compounds, including imidazolium [21,22] and phosphonium unpublished results based dications, as well as those with differing linkage chains [22,23] and even unsymmetrical species [23].…”

Basic Overview on Gas Chromatography Columns

“…For example, their viscosity can be varied over a broad range, they exhibit high thermal stability, they can be coated on fused silica capillaries with high efficiency, they have unique solvent properties, and they can be immobilized and cross-linked. Indeed, IL stationary phases exhibit dual properties in that they separate nonpolar analytes (as if they were nonpolar stationary phases) and simultaneously separate polar analytes (as if they were polar stationary phases) [19][20][21][22][23][24].…”

Determination of three physical properties of quinoline ionic liquids with hexafluorophosphate

“…; PEG is also inexpensive and widely available. Those incorporating PEG moieties into ILs (IL PEG ) can make the ILs share their properties [4], which can yield a new appealing group of properties with the structural modification of cation and anion in ILs. Despite the great possibilities in application of the IL-PEG system, there are limited reports about their properties or fundamental data [4,5].…”

“…Those incorporating PEG moieties into ILs (IL PEG ) can make the ILs share their properties [4], which can yield a new appealing group of properties with the structural modification of cation and anion in ILs. Despite the great possibilities in application of the IL-PEG system, there are limited reports about their properties or fundamental data [4,5]. Recently, ILs shows great prospect as extraction solvents in liquidliquid extraction, solid-liquid extraction and liquid-phase extraction because of their good solubility property [6,7], and they play an important role in extracting compounds such as protein [8], heavy-metal ions [9], traditional Chinese medicine from complicated samples [10], and they can improve selectivity remarkably as well as efficiency.…”

“…Recently, ILs shows great prospect as extraction solvents in liquidliquid extraction, solid-liquid extraction and liquid-phase extraction because of their good solubility property [6,7], and they play an important role in extracting compounds such as protein [8], heavy-metal ions [9], traditional Chinese medicine from complicated samples [10], and they can improve selectivity remarkably as well as efficiency. Furthermore, it was reported that waterimmiscible BF 4 -based ILs can be used in the extraction of metal ions from wasted water [11].…”