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    題名: Calamitic metallomesogens derived from unsymmetric pyrazoles
    作者: Chen,MC;Lee,SC;Ho,CC;Hu,TS;Lee,GH;Lai,CK
    貢獻者: 中央大學
    關鍵詞: LIQUID-CRYSTAL BEHAVIOR;COPPER-COMPLEXES;STRUCTURAL-CHARACTERIZATION;ALLYLPALLADIUM COMPLEXES;COLUMNAR METALLOMESOGENS;COORDINATION CHEMISTRY;LIGANDS;MESOMORPHISM;DERIVATIVES;MESOPHASES
    日期: 2009
    上傳時間: 2010-06-29 19:44:56 (UTC+8)
    出版者: 化學研究所
    摘要: Three series of copper(II) complexes 1a-1c derived from unsymmetric pyrazoles 2a-2c were prepared and their mesomorphic properties investigated. The mesomorphic behavior of compounds was studied by differential scanning calorimetry, polarizing optical microscopy, and powder X-ray diffractometry. The crystal and molecular structures of mesogenic copper complex (2a; n=10) of 3-[4-decyloxyphenyl]-1H-pyrazole were determined by means of X-ray structural analysis. It crystallizes in the triclinic space group p-1, with a=4.0890(1) angstrom, b=18.0167(2) angstrom, c=25.5015(5) angstrom, and Z=2. The geometry at copper center was not perfectly square planar. A weak intermolecular H-bond (d=2.36 angstrom) between Cl1 and H2 atoms and pi-pi interaction (ca. 3.45-3.55 angstrom) was also observed. All their precursors 2a-2c were not mesogenic. In contrast. copper complexes 1a formed nematic or smectic C phases and complexes 1b-1c formed crystalline phases. Powder X-ray diffraction experiments confirmed the presence of SmC phase. (C) 2009 Elsevier Ltd. All rights reserved.
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