Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (4): 447-454.DOI: 10.11944/j.issn.1000-0518.2020.04.190231

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Evaluation of Silane Imidazolium Bis(trifluoromethane)sulfonimide Ionic Liquid Stationary Phase for Gas Chromatography

MA Haoa,ZHAO Xueb,LI Kunlana,SHAO Guolina,AN Qingdaa*(),YANG Liyua,WEI Liganga*()   

  1. aSchool of Light Industry & Chemical Engineering, Dalian Polytechnic University,Dalian,Liaoning 116034,China;
    bDalian Zhonghuida Scientific Instrument Co. Ltd.,Dalian,Liaoning 116023,China
  • Received:2019-09-02 Accepted:2020-02-27 Online:2020-04-01 Published:2020-04-10
  • Contact: AN Qingda,WEI Ligang
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21776026)

Abstract:

Silane imidazolium ionic liquids (ILs) with different alkyl substituted groups (C1,C2 and C4) on the cations and bis(trifluoromethane)sulfonimide ions ([NTf2]-) as the anions were synthesized as the stationary phase for packed column gas chromatography. The silane-based imidazolium ILs are strong polar stationary phases. The cation structure influences the thermal stability, polarity and separation properties. The separation behavior of 1-butyl-3-[(3-trimethoxysilyl)-propyl]imidazolium bis(trifluoromethane)sulfonimide ([PBIM]NTf2) is better than that of other IL stationary phases. The [PBIM]NTf2 stationary phase was further evaluated using solvation parameter model. The interaction mechanism between stationary phase and components as well as separation properties of [PBIM]NTf2 column for different chemical compounds were investigated. The results indicate that hydrogen-bond basicity and dipole-dipole interactions as the main intermolecular forces exist between [PBIM]NTf2 and components. The stationary phase shows a good selectivity for the components such as Grob test mixture, alkanes, alcohols, esters and amines.

Key words: ionic liquid, silane, gas chromatography, stationary phase