| 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 this 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 have been characterized and a comprehensive study on the structural variations attributing to changes in properties such as melting point, thermal stability, viscosity, density and miscibility has been carried out.;In the next section, application of trigonal tricationic ionic liquids (TTILs) as gas chromatographic stationary phases is discussed. Solvation parameters of these TTILs obtained through Abraham solvation parameter model were different from other ILs. Some of these TTILs 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, the development of three polymeric chiral stationary phases for high performance liquid chromatography (HPLC) and supercritical fluid chromatography (SFC) is discussed. These were found to be exceptional stationary phases for target chiral analytes in both normal phase HPLC as well as SFC. They showed faster separations and good sample loading capacity with promising preparative LC capability. |
