Solute—solvent interactions in tetra-n-butylphosphonium salts studied by gas chromatography

Pomaville, Rena M.; Poole, Salwa K.; Davis, LaDonna J.; Poole, Colin F.

doi:10.1016/s0021-9673(00)90227-9

Cited by 48 publications

(12 citation statements)

References 19 publications

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“…Poole's group was largely responsible for the introduction and characterization of the first generation of ionic liquids (which they called liquid organic salts) suitable for gas chromatography and for the studies of their fundamental properties aimed at answering the above questions. These ionic liquids were mainly alkylammonium and alkylphosphonium salts with weak nucleophilic anions (Table 1), a number of which had liquid temperature ranges that exceeded 100°C (Table 2) 9–17. The liquid temperature range for an organic salt depends on its melting point or glass transition temperature at the low end and the decomposition temperature or volatility of the ionic liquid at the high end of the temperature scale.…”

Section: Packed Columnsmentioning

confidence: 99%

Ionic liquid stationary phases for gas chromatography

Poole

2011

J of Separation Science

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212

108

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This article provides a summary of the development of ionic liquids as stationary phases for gas chromatography beginning with early work on packed columns that established details of the retention mechanism and established working methods to characterize selectivity differences compared with molecular stationary phases through the modern development of multi-centered cation and cross-linked ionic liquids for high-temperature applications in capillary gas chromatography. Since there are many reviews on ionic liquids dealing with all aspects of their chemical and physical properties, the emphasis in this article is placed on the role of gas chromatography played in the design of ionic liquids of low melting point, high thermal stability, high viscosity, and variable selectivity for separations. Ionic liquids provide unprecedented opportunities for extending the selectivity range and temperature-operating range of columns for gas chromatography, an area of separation science that has otherwise been almost stagnant for over a decade.

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Section: Packed Columnsmentioning

confidence: 99%

Ionic liquid stationary phases for gas chromatography

Poole

2011

J of Separation Science

Self Cite

212

108

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“…Thermodynamic characterization of solute -solvent interactions for tetrabutyl cationic and 4-toluene sulfonate anionic ILs has shown these ILs act as polar, nonionic GC phases [34]. A thermodynamic comparison of tetra-n-butyl-phosphonium and -ammonium ILs showed the phosphonium compounds solvate hydrocarbons better [35]. Enhanced weak dispersive forces and proton donor interactions for tetraalkyl ammonium perfluoroalkane sulfates as compared to their hydrocarbon GC stationary phase counterparts was a major conclusion [36,37].…”

Section: Ils As Standard-coated Gc Stationary Phasesmentioning

confidence: 99%

Utility of ionic liquids in analytical separations

Shamsi

Danielson

2007

J of Separation Science

179

103

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Ionic liquids (ILs), as separation media, have made significant contributions in the past decades in advancing research in gas chromatography (GC), liquid chromatography (LC), and capillary electrophoresis (CE). This review, covering reports published from the mid 1980s to early 2007, shows how ILs have been used so far in separation science, originally primarily as GC stationary phases and later as mobile phase additives (both millimolar and major percent levels) for LC and CE. Representative GC and LC chromatograms as well as CE electropherograms are shown. In addition, the very recent findings on the development of ionic liquids with surfactant properties and its applications for chiral and achiral analysis are discussed.

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“…The same authors also commented on an alternative approach involving the use of an ion-exchange resin for the conversion of the iodide salt to hydroxide, but concluded that this approach was less desirable. Low-melting salts based on cations such as tetrabutylphosphonium [42] and trimethylsulfonium [43] have also been produced by very similar synthetic methods.…”

Section: Anion Metathesismentioning

confidence: 99%