A novel discotic liquid crystal based on 1,3,4-thiadiazole

• Main Authors: Chi-Shuen Huang, 黃啟舜
• Other Authors: Chung-Kung Lai
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/91775315936438796932

碩士 === 國立中央大學 === 化學研究所 === 94 === In the first series, the preparation, characterization and mesomorphic properties of palladium chloride and palladium bromide complexes derived from bis-(1,3,4-thiadiazole) derivatives are described. These compounds with a different number of alkoxy side chain exhibited various mesophases, which were studied and investigated by differential scanning calorimeter (DSC), polarized optical microscopy (POM) and powder X-ray diffraction (XRD). The formation of mesophases was found to be sensitive to the number of the alkoxy side chain, carbon length of the side chains, stereo geometry, and the coordination of metal centers. As light emittng materials, the physical properties by UV-Vis spectrophotometer, and photoluminescence (PL) were also studied and discussed. In the second series, a new type of metallomesogenic complexes structurally similar to the first series with a OH group added was prepared ane studied. Theses metal complexes were coordinated in different geometries from the first series. All compounds in the series existing intramolecular hydrogen bond and an ESIPT behavior, were investigated by FT-IR and UV-PL. In addition, in order to better understand the molecular arrangement in columnar mesophases, the molecular volume dilatomery and other parameters were also measured and discussed.