Liquid Crystals of Cobalt, Nickel, Copper and Zinc Complexes Derived from Dihydrazone-Bipyridine Moiety

• Main Authors: Wen-Hui Fan, 范文蕙
• Other Authors: 王文竹
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/27022369767749881929

碩士 === 淡江大學 === 化學學系碩士班 === 94 === The synthesis of new metal complexes based on hydrazones derived from 6,6’-dihydrazine- 2,2’-bipyridine has been carried out, and use different lengths of alkyl chains to modify the ligands (L1-Cn~L3-Cn). The complexes were prepared by adding the metal salts included of cobalt, nickel, copper and zinc. The molecular structure and purity of these novel compounds have been verified by NMR, ESI-Mass, elemental analysis, and the single crystal of [Zn(L1-C2)Cl2] were also obtained. The phase behavior and mesogenic properties of these compounds were determined by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and powder x-ray diffraction techniques. [Co(L2-Cn)Cl2]、[Ni(L2-Cn)Cl2]、[Zn(L2-Cn)Cl2] complexes exhibit discotic mesophase. The π-π* transition of these ligands occurred at 340 nm, and the charge transfer band of complexes were observed at ca. 400-420 nm in the absorption spectra. The fluorescent properties of [Zn(L1-Cn)Cl2] and [Zn(L2-Cn)Cl2] series were examined at 530 nm and 545 nm.