- 作者: 范倍誠 ; 賴重光
- 作者服務機構: 中央大學化學系
- 中文摘要: The preparation and mesogenic properties of a series of discotic .beta.-diketonate metal complexes are reported. The results show that the density of side chains, positions of side chains, and the geometries of the metal centers play important roles in determining the mesomorphic behaviors and thermodynamic stability of these complexes. In the series of copper complexes, all these disc-like molecules with eight alkoxy side chains exhibit columnar hexagonal disordered (D/sub hd/) mesophases. In the series of copper complexes with six side chains, only compounds substituted with longer alkoxy chains (n=C/sub 14/ or C/sub 16/) exhibit discotic columnar mesophase. However, in the series of complexes, only crystal-to-isotropic transitions were observed. The results showed that induction of liquid crystallinity not only depends on the numbers of side chains(i.e. side chain density), but also on the degree of distribution over the central core. Palladium complexes analogs exhibit similar discotic mesophases, and due to their greater core-core organization, they also have higher clearing points and wider temperature range of mesophases than copper complexes.
- 英文摘要: --
- 中文關鍵字: Metallomesogen; Discotic Hexagonal Phase; .Beta.-Diketonate; Columnar Superstructure
- 英文關鍵字: 液晶金屬錯合物;盤形六方晶形相;.beta.-雙二酮基;柱狀超結構