beta-Diketone, pyrazole and isoxazole derivatives with polar groups: Liquid crystalline and non-linear optical properties
作者:
JOAQUIN BARBERA,
RAQUEL GIMENEZ,
JOSE LUIS SERRANO,
RAFAEL ALCALA,
BELEN VILLACAMPA,
JULIO VILLALBA,
ISABELLE LEDOUX,
JOSEPH ZYSS,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 22,
issue 3
页码: 265-273
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997209315
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The liquid crystalline behaviour of 1-(4-n-decyloxyphenyl)-3-(4-X-phenyl)propan-1,3-diones and their pyrazole and isoxazole derivatives has been studied by optical microscopy, DSC and X-ray techniques. The 4-substituents (X) were chosen to include a range of different polar and non-polar substituents: H, OCH3, Cl, Br and CN. A monotropic SA phase is observed for the beta-diketone derivative in which X CN and this is the first example of this phase found in a 1,3-diphenylpropan-1,3-dione derivative. The majority of the pyrazole and isoxazole compounds show SA phases. As regards the cyano-substituted compounds, X-ray diffraction studies on the mesophase show that the layer spacing is consistent with a partial bilayer SA mesophase. The first hyperpolarizabilities of the cyano-derivatives due to their push-pull structure have been measured by the EFISH method. Values for these compounds were found to be comparable to those for other conjugated CH3O-pi-CN systems.
点击下载:
PDF (230KB)
返 回