Stationary phase properties of the organic molten salt ethylpyridinium bromide in gas chromatography

Pacholec, F.; Poole, Colin F.

doi:10.1007/bf02262375

Cited by 49 publications

(16 citation statements)

References 5 publications

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“…Early on, liquid organic salts such as ethylammonium nitrate and ethylpyridinium bromide were used as stationary phases, but they suffered from narrow liquid ranges and poor chromatographic efficiency (22,23). Recently, imidazolium-based RTILs were used as stationary phases, and the retention behavior of various molecules was examined on BMIM-PF 6 and BMIM-Cl (19).…”

Section: Gcmentioning

confidence: 99%

Ionic Liquids in Analytical Chemistry

Anderson¹,

Armstrong²,

Wei³

2006

Anal. Chem.

493

326

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oom-temperature ionic liquids (RTILs), also known as liquid organic, molten, or fused salts, are a class of nonmolecular ionic solvents with low melting points. The accepted definition of an RTIL is any salt that has a melting point lower than ambient temperature (1). However, "ionic liquid" (IL) is often applied to any compound that has a melting point <100°C. Most common RTILs are composed of unsymmetrically substituted nitrogen-containing cations (e.g., imidazole, pyrrolidine, pyridine) with inorganic anions (e.g., Cl -, PF 6 -, BF 4 -). ILs are also interesting because of their other useful and intriguing physicochemical properties. Wilkes et al. first reported ambient-temperature ILs based on the 1-alkyl-3-methylimidazolium cation in 1982 (2). Since then, many ILs containing a variety of cations and anions of different sizes have been synthesized to provide specific characteristics.Over the past few years, research and applications of ILs have expanded tremendously. The initial impetuses for this expansion were organic synthesis and the growth of green chemistry. In this article, we will give an overview of the structure and properties of ILs and describe their expanding use in various applications in separations and chromatography, MS, spectroscopy, and electrochemistry. Description and propertiesILs have negligible vapor pressures at room temperature, possess a wide range of viscosities, can be custom-synthesized to be miscible or immiscible, often have high stability, and are capable of un-

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Section: Gcmentioning

confidence: 99%

Ionic Liquids in Analytical Chemistry

Anderson¹,

Armstrong²,

Wei³

2006

Anal. Chem.

493

326

View full text Add to dashboard Cite

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“…Currently, the most frequent analytical utility of RTILs has been within the separation sciences, particularly as stationary phases in GLC [17][18][19] or mobile phase additives or run buffer modifiers in capillary separations where they have found merit in improving band broadening, resolution, peak efficiency, separation time, tailing/symmetry, as well as in suppressing the deleterious effects of free silanols [20][21][22][23][24][25]. Given the broad range of solvation-type interactions available to RTILs, GLC has been particularly useful in mapping out the nature, efficiency, and selectivity of solute retentive behavior by RTILs [26].…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic chromatographic characterization of novel pseudo‐phases based on N‐alkyl‐N‐methylpyrrolidinium ionic liquid type surfactants

et al. 2006

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MEKC and linear solvation free energy relationships (LSFERs) have been used to characterize the solute distribution between water and self-assemblies formed from ionic liquid type mono-chain cationic surfactants containing a cyclic pyrrolidinium head group. Several features of the solvation environment afforded by these micellar solutions were found to be quite different from that of CTAB, a structurally analogous cationic surfactant with a conventional, acyclic quaternary ammonium head group. None of the LSFER coefficients were found to vary in any systematic way with increasing alkyl chain length for these unique surfactants. Overall, however, these surfactants display different behavior than do all known cationic detergents such as CTAB. In chemical terms, pseudo-phases formed by these N-alkyl-N-methylpyrrolidinium bromides interact more strongly with polar compounds and less strongly with compounds having nonbonding or pi-electrons and are more cohesive compared to the well-studied CTAB.

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“…However, practical application of this salt was limited due to poor efficiency. Ethylpyridinium bromide was the first IL that was demonstrated to have acceptable chromatographic properties and useful separation selectivity [18] with a liquid temperature range of 110-160°C and it exhibited chromatographic efficiencies similar to those of conventional stationary phases. ILs have many properties that make them exceptional stationary phases.…”

Section: Novel Materials As Gc Stationary Phasesmentioning

confidence: 99%