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Examination of Selectivities of Thermally Stable Geminal Dicationic Ionic Liquids by Structural Modification

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Abstract

Dicationic ionic liquids (ILs) are widely used as gas chromatography (GC) stationary phases as they show higher thermal stabilities, variety of polarities, and unique selectivities towards certain compounds. An important aspect contributing to them is that they show multiple solvation interactions compared to the traditional GC stationary phases. Dicationic ILs are considered as combination of three structural moieties: (1) cationic head groups; (2) a linkage chain; and (3) the counter anions. Modifications in these structural moieties can alter the chromatographic properties of IL stationary phases. In this study, a series of nine thermally stable IL stationary phases were synthesized by the combination of five different cations, two different linkage chains, and two different anions. Different test mixtures composed of a variety of compounds having different functional groups and polarities were analyzed on these columns. A comparison of the separation patterns of these different compounds on nine different IL columns provided some insights about the effects of structural modifications on the selectivities and polarities of dicationic ILs.

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Acknowledgements

We gratefully acknowledge the Robert A. Welch Foundation (Y0026) for the support of this work.

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Authors and Affiliations

  1. Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX, USA

    Rahul A. Patil, Mohsen Talebi & Daniel W. Armstrong

  2. MilliporeSigma, Bellefonte, PA, USA

    Leonard M. Sidisky

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  1. Rahul A. Patil
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  2. Mohsen Talebi
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  3. Leonard M. Sidisky
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  4. Daniel W. Armstrong
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Correspondence to Daniel W. Armstrong.

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All authors declare that they have no conflicts of interest. The commercial SLB IL111 column was provided by MilliporeSigma and Len Sidisky is employee of MilliporeSigma.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Patil, R.A., Talebi, M., Sidisky, L.M. et al. Examination of Selectivities of Thermally Stable Geminal Dicationic Ionic Liquids by Structural Modification. Chromatographia 80, 1563–1574 (2017). https://doi.org/10.1007/s10337-017-3372-5

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