The College of Education for Pure Sciences reviewed a master's thesis on the preparation and characterization of liquid crystal compounds, their biological activity, and computational modeling. The thesis, submitted by researcher Haider Hami Ghater, involved the preparation of fourteen novel homologous and heterologous dimers derived from benzothiazole. The aim was to study the effect of alkyl chain length in the molecular midsection, as well as the effect of the substituent group type at position (6) of the aromatic ring. The liquid crystal properties were characterized using differential scanning calorimetry (DSC) and polarized light microscopy. Some dimers exhibited characteristic nematic phases with a marble-like texture upon heating and a Schlieren texture upon cooling.

The thesis comprised three chapters. The first chapter included an introduction to liquid crystals, their classification, and a study of the effect of molecular structure on the liquid crystal properties of homologous and heterologous dimers. Chapter Two involved the preparation of a series of homodimers (F-OnO-F) with the following structure:

A series of homodimers (F-OnO-F) to illustrate the effect of alkyl chain length in the molecular axis:
The homodimers (Cl-OnO-Cl) and (H-OnO-H) to illustrate the effect of the substituent group type at position (6) of the aromatic ring in benzothiazole:
The homodimer F-COO4OOC-F
The heterodimer F-COO6SOC-F
The prepared dimers were characterized using the following spectroscopic methods (1H-NMR, Mass spectrometry, FT-IR).
Chapter Three involved studying the liquid crystal properties of some of the prepared homodimers using differential scanning calorimetry (DSC) and polarized light microscopy, and characterizing the phases and histological structures of the nematic phase in the dimers that exhibited liquid crystal properties. The F-OnO-F dimers at (n=1-3) did not exhibit liquid crystalline properties, while the F-OnO-F dimers at (n=4-6,8) showed crystalline properties in heating and cooling, whereas the F-O9O-F dimer showed the nematic phase only in cooling

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