| dc.description.abstract | Three series of mesogenic compounds were prepared and studied in this thesis. All compounds described were characterized via 1H-NMR, 13C-NMR, and elemental analysis. The mesophases were studied and investigated by POM, DSC, and the structures of the mesophases were also confirmed by variable temperature X-ray diffraction experiments.
In the first series, we succeed to synthesize the ligand 2a, 2b, 2c, 2d, 2e and 2f and their complexes 1a-1f .The compound 2a and 2b are SmC phase; compound 2d, 2e have N and SmA phase; compound 2f is SmC phase, then the compound 2a, 2b , 2c, 2d, 2e and 2f coordination with Copper (II) for the metal ligand complexes are formed 1a-1f, found that the compounds having a rod-like liquid crystal properties 1a, 1c there discotic liquid nature.
In the second series, the compound 1g has SmC phase, the compound 1h has odd-even effect, the compound 1i has N phase.
And the last series, these compounds 3a and 3b have been synthesized by the reaction of 4a and 4b with hydroxylamine hydrochloride in ethyl alcohol. The formation of mesophases was found to be sensitive to the number of carbon side chains. The result indicated that compounds 3a which has three carbon chains is crystal phases, however, compounds 3b which has six side chains is Columnar hexagonal phases.
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