Preparation and evaluation of a novel bonded imidazolium ionic liquid as stationary phase for gas chromatography

Abstract

1-Butyl-3-[(3-trimethoxysilyl)propyl]imidazolium chloride ionic liquid was synthesized and chemically modified onto the inner wall of a fused capillary column as a stationary phase for gas chromatography. The 1-butyl-3-[(3-trimethoxysilyl)propyl]imidazolium chloride ionic liquid bonded capillary column was evaluated in detail. The results revealed that the ionic liquid bonded capillary column exhibited high column efficiency of 1.08 × 10 plates/m, and good chromatographic separation selectivity (α) for polar and non-polar substances, and a good thermal stability between room temperature and 400°C. Moreover, the determination of thermodynamic parameters and the linear solvation energy relationship were further carried out. The results indicated that the chromatographic retention of each probe molecule on the ionic liquid bonded stationary phase was an enthalpy-driven process, and the system constants of the linear solvation energy relationship signified that the dispersion interaction, the hydrogen bonding acidity and hydrogen bonding basicity were dominant interactions between probes and stationary phase among five interactions during the chromatographic separation. However, the contribution of each specific interaction for the stationary phase is ranked as the dispersion interaction > the hydrogen bonding basicity > the hydrogen bonding acidity.

Thermal stability of poly[1‐(trimethylsilyl)‐1‐propyne] and the gas chromatographic stationary phase based on it

“…The columns permeability K v was calculated according to K V = d c 2 /32 = 8.51 × 10 –10 m 2 . Synthesis of PTMSP was performed according to the method described earlier using Nb catalyst. The molar mass of PTMSP was 200 000 Da with polydispersity of 1.2. Determination of thermal stability of the novel stationary phases is one of the essential tasks while characterizing them . However, the suggested methods vary greatly.…”

“…Determination of thermal stability of the novel stationary phases is one of the essential tasks while characterizing them . However, the suggested methods vary greatly.…”

Advances of Ionic Liquids in Analytical Chemistry

“…The developed IL stationary phase exhibited a thermal stability up to 290 °C and column efficiency of 2000 plates·meter –1 . In a similar application, Dai et al immobilized the 1-butyl-3-[(3-trimethoxy-silyl)­propyl]­imidazolium chloride ([C 4 ((MOSi) 3 C 4 )­IM + ]­[Cl – ]) IL onto the inner wall of a fused-silica capillary to improve thermal stability . However, peak tailing of common analytes such as octane and butanol was observed to be a major challenge for further application.…”

Amphiphilic tocopheryl polyethylene glycol succinate as gas chromatographic stationary phase for high‐resolution separations of challenging isomers and analysis of lavender essential oil

“…To acquire a high-efficiency column, it is essential that Article Related Abbreviation: TPGS, D-α-tocopheryl polyethylene glycol succinate a stationary phase has good wettability on the capillary surface, which is affected by the nature of the stationary phase and the column surface [5,6]. To this end, some effective measures are taken such as surface pretreatment [7][8][9] and using a mixture of a stationary phase with a polysiloxane [10][11][12]. For wettability improvement, surfactants are known to be able to stabilize the interface between a liquid and a solid by decreasing their surface and interfacial tension [13,14].…”