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Synthesis and Characterization of Polymeric Ionic Liquids and Applications in Solid-Phase Microextraction Coupled with Gas Chromatography

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2011, Doctor of Philosophy, University of Toledo, Chemistry.

Ionic liquids (ILs) are a class of molten salts with melting points considerably lower than conventional inorganic salts. Their unique properties make them an ideal class of separation media for various sample preparation techniques. Polymeric ionic liquids (PILs) inherit many physical properties of ILs such as high thermal stability, negligible vapor pressure, multiple solvation interactions and can easily be chemically modified to tether a variety of functional groups. In addition, PILs possess high viscosity making them amenable to forming stable, thin films on the fused silica glass fibers, a requirement of solid-phase microextraction (SPME). SPME is a high speed sample preparation technique possessing a number of advantages such as simplicity, and no organic solvent requirement. The marriage of PILs with SPME opens a new avenue in the search for new sorbent coatings. This dissertation is dedicated towards the design and synthesis of PILs and employs them as SPME sorbent coatings coupled with gas chromatography (GC).

The dissertation begins with the definition of ILs. The applications of ILs in a number of sample preparation techniques are introduced. The following chapters describe the synthesis of various PILs and their application as SPME sorbent coatings for the extraction of various analytes. PILs including poly(1-vinyl-3-hexadecylimidazolium) bis[(trifluoromethyl)sulfonyl]imide (poly([ViHDIm] [NTf2])), poly(1-(4-vinylbenzyl)-3-hexadecylimidazolium bis[(trifluoromethyl)sulfonyl]imide) (poly(VBHDIm+ NTf2-)), and poly(1-vinyl-3-hexylimidazolium chloride) (poly(ViHIm+Cl-)) were synthesized.

The poly([ViHDIm] [NTf2]) PIL provides stable SPME coatings for both headspace-SPME or direct-immersion SPME, and can be used at elevated temperature conditions to perform extractions. The poly(VBHDIm+ NTf2-) PIL exhibited high affinity towards analytes bearing aromatic groups due to the presence of benzyl-functional moieties in the PIL structure. The poly(ViHIm+Cl-) PIL demonstrated high selectivity towards polar analytes with high hydrogen bond acidity, due to the high hydrogen bond basicity of the Cl- anion in the PIL structure.

Jared Anderson, PhD (Advisor)
Jon Kirchhoff, PhD (Committee Member)
Wendell Griffith, PhD (Committee Member)
Constance Schall, PhD (Committee Member)
149 p.

Recommended Citations

Citations

  • Meng, Y. (2011). Synthesis and Characterization of Polymeric Ionic Liquids and Applications in Solid-Phase Microextraction Coupled with Gas Chromatography [Doctoral dissertation, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1310132069

    APA Style (7th edition)

  • Meng, Yunjing. Synthesis and Characterization of Polymeric Ionic Liquids and Applications in Solid-Phase Microextraction Coupled with Gas Chromatography. 2011. University of Toledo, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1310132069.

    MLA Style (8th edition)

  • Meng, Yunjing. "Synthesis and Characterization of Polymeric Ionic Liquids and Applications in Solid-Phase Microextraction Coupled with Gas Chromatography." Doctoral dissertation, University of Toledo, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1310132069

    Chicago Manual of Style (17th edition)