Calamitic metallomesogens derived from unsymmetric pyrazoles

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题名:	Calamitic metallomesogens derived from unsymmetric pyrazoles
作者:	Chen,MC;Lee,SC;Ho,CC;Hu,TS;Lee,GH;Lai,CK
贡献者:	中央大學
关键词:	LIQUID-CRYSTAL BEHAVIOR;COPPER-COMPLEXES;STRUCTURAL-CHARACTERIZATION;ALLYLPALLADIUM COMPLEXES;COLUMNAR METALLOMESOGENS;COORDINATION CHEMISTRY;LIGANDS;MESOMORPHISM;DERIVATIVES;MESOPHASES
日期:	2009
上传时间:	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.
關聯:	TETRAHEDRON
显示于类别:	[化學研究所] 期刊論文

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