Graduation Semester and Year

2011

Language

English

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Chemistry

Department

Chemistry and Biochemistry

First Advisor

Daniel W Armstrong

Abstract

Due to the characteristics unique to ionic liquids (ILs), they are found in a plethora of applications from simple liquid-liquid extractions to a proposed liquid medium for a lunar telescope. These applications require a thorough knowledge of the physical and chemical properties of ionic liquids and the knowledge to tune the structure to obtain the desired properties. In my dissertation I have described the systematical design and synthesis of a large number of dicationic, trigonal tricationic and linear tricationic ionic liquids. Their physicochemical properties are characterized and the structural variations attributing to the properties such as melting point, thermal stability, viscosity, density and miscibility are studied. In the next section, application of trigonal tricationic ionic liquids as gas chromatographic stationary phases is discussed. Some of these ILs were found to be highly polar stationary phases similar to the commercial SP-2331 (a cyanopropyl phase commercialized by Supelco-Sigma-Aldrich) but with better peak shapes for highly polar analytes, higher thermal stabilities and in some cases unique selectivities. In the last section, I have discussed the development of three polymeric chiral stationary phases for high performance liquid chromatography (HPLC) and supercritical fluid chromatography (SFC). These were found to be exceptional stationary phases for target chiral analytes in both normal phase HPLC as well as SFC. They showed faster separation and good sample loading capacity with promising preparative LC capability.

Disciplines

Chemistry | Physical Sciences and Mathematics

Comments

Degree granted by The University of Texas at Arlington

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