| Summary: | 碩士 === 國立中央大學 === 化學系 === 85 === In thesis three homologous serious of ligands；5-alkoxyl-1,3-
bis[3-(4-alkoxyphenyl)-3-oxopropanoyl]benzene，5-alkoxyl-1,3-
bis[3-(3,4-dialkoxyphenyl)-3-oxopropanoyl]benzene，5-
alkoxyl-1,3-bis[3-(3,4,5-trialkoxyphenyl)-3-oxopropanoyl]benzene
and their corresponding metal complexes (copper, vanadyl,
nickel, cobalt and palladium) were synthesized and also
characterized. 1H and 13C NMR were used to identify the
structures, and to confirm their purity.The metal complexes were
characterized by 1H NMR, IR, spectra and elemental analysis. The
thermal behavior and liquid crystallinity of these metal
complexes were also studied and investigated based on DSC
analysis, polarized optical microscope. Experiment data showed
that bicoper, bivanadyl and binickel complexes of all three
serious ligands exhibited liquid crystalline behavior. Bicopper
and binickel complexes exhibited discotic hexagonal disordered
phases, however, bivanadyl complexes exhibited discotic
rectangular disordered phases Preliminary data indicated that
bipalladium and bicobalt complexes exhibited only crystalline
phase. By systematic comparison of various molecular structure
with mesomorphic behavior the formation of ligand crystallinity
was mainly dependent on metal centers. Coordination interaction
between metal centers influenced the formation of the liquid
crystallinity. Experimental daua also revealed that the carbon
length, i.e. approximate aspect ratio, directly stabilized the
mesophases.
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