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Physical Ionic Liquid/Polysiloxane Mixtures for Tuning the Polarity and the Selectivity of the Polysiloxane Stationary Phase for GC Analysis

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Abstract

Two novel room-temperature ionic liquids (RTILs), a mono-cationic (tetra-n-octylammonium) and a dicationic (bis-methylpiperidinium-butylidene) room-temperature ionic liquid with the bis[(trifluoromethyl)sulfonyl]imide anion, were individually mixed with OV-1701 polysiloxane to tune the selectivity and the polarity of stationary phases for GC. The interaction properties of the stationary phases were investigated on the basis of polarity calculations and the linear solvation energy relationship. The incorporation of the monocationic RTIL in the OV-1701 increased the dipolarity/polarizability capacities (s) and the hydrogen-bond basicity ability (a) allowing the separation of the m-chloroaniline/p-chloroaniline isomers and the m-xylene/p-xylene isomers which are not usually separated on polysiloxane stationary phase. The mixed stationary phases exhibited a greater selectivity than the OV-1701 phase for the majority of the aromatic compounds tested, demonstrating a kind of synergistic effect of the combination of polysiloxane and RTIL. The addition of RTIL proved to be an original method to modulate the polarity and the selectivity of the stationary phase of intermediate polarity in order to prepare stationary phases dedicated for specific separation with good durability (more than 20 months and more than 1,000 injections) and without any loss of thermal stability.

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Acknowledgments

The authors gratefully acknowledge the interregional program Centre Régional Universitaire Normand de Chimie (CRUNCh) for its financial support. The authors thank the Conseil Régional de Haute Normandie, France, for the PhD Grant awarded to Aurelien Curat.

Conflict of interest

The authors have declared no conflict of interest.

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Authors and Affiliations

  1. EA 3233, Sciences et Méthodes Séparatives, Normandie Univ, Université de Rouen, FR 3038, I.R.C.O.F Rue Tesnière, Mont-Saint-Aignan Cedex, 76821, France

    Aurélien Curat, Séverine Tisse, Angélique Andrieu & Pascal Cardinael

  2. Laboratoire de Chimie Moléculaire et Thioorganique, UMR CNRS 6507, Normandie University, ENSICAEN and Université de Caen INC3M, FR 3038 Labex EMC3 and SynOrg, Caen, 14050, France

    Aurélien Curat, Nathalie Bar & Didier Villemin

Authors
  1. Aurélien Curat
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  2. Séverine Tisse
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  3. Angélique Andrieu
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  4. Nathalie Bar
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  5. Didier Villemin
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  6. Pascal Cardinael
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Correspondence to Séverine Tisse or Pascal Cardinael.

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Curat, A., Tisse, S., Andrieu, A. et al. Physical Ionic Liquid/Polysiloxane Mixtures for Tuning the Polarity and the Selectivity of the Polysiloxane Stationary Phase for GC Analysis. Chromatographia 77, 1671–1681 (2014). https://doi.org/10.1007/s10337-014-2784-8

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  • DOI: https://doi.org/10.1007/s10337-014-2784-8

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