申请人:Nippon Mining Co., Ltd.
公开号:US05098602A1
公开(公告)日:1992-03-24
This invention provides a novel halogen-containing ester compound represented by the following general formula (I): ##STR1## (wherein R is an alkyl group, A is selected from a single bond, --O--, --COO-- and --CO--, both of X and Y are halogen atoms or either one of X and Y is a halogen atom and the other is a hydrogen atom, each of m and n is 0 or 1, m+n=0 or 1, each of k and l is an integer of 1 or more, provide k<l), a liquid crystal composition and a light switching element each containing the above compound as well as a novel fluorophenol compound represented by the following general formula (II): ##STR2## (wherein each of k and l is an integer of 1 or more, provided k<l) as an intermediate for the synthesis of the above ester compound and a method of producing the same.
这项发明提供了一种新颖的含卤酯基化合物,其通式为(I):##STR1##(其中R是烷基,A从单键、-O-、-COO-和-CO-中选择,X和Y均为卤素原子或X和Y中的一个为卤素原子另一个为氢原子,m和n分别为0或1,m+n=0或1,k和l分别为1或更多的整数,提供k
Drastic enhancement of discotic mesomorphism induced by fluorination of the peripheral phenyl groups in triphenylene mesogens
作者:Yasuyuki Sasada、Hirosato Monobe、Yasukiyo Ueda、Yo Shimizu
DOI:10.1039/b716920e
日期:——
Four derivatives of hexakis(4-alkoxybenzoyloxy)triphenylene, for which peripheral phenylene groups are fluorinated at the inner and the outer positions were studied for their mesomorphic behaviour to reveal that the alteration of fluorinated positions in the phenyl rings leads to a drastic change of the mesomorphism involving the thermal stability.
研究了四种六(4-烷氧基苯甲酰氧基)三亚苯的衍生物,这些衍生物的外围亚苯基基团在内部和外部位置被氟化,研究结果表明,改变苯基环中的氟化位置会导致涉及热稳定性的中间形态发生急剧变化。
Influence of a fluorine substituent on the mesomorphic properties of unsymmetrical five-ring bent-core compounds
作者:H. N. Shreenivasa Murthy、B. K. Sadashiva
DOI:10.1039/b406548b
日期:——
The synthesis and mesomorphic properties of unsymmetrical five-ring bent-core compounds containing a fluorine substituent in one of the arms are reported. A comparison of the properties with the symmetrical compounds having two fluorine substituents indicates that the position of this substituent has an influence on the nature of the mesophase observed. Evidence for the occurrence of a transition from the rectangular columnar (B1) phase to an antiferroelectric lamellar (B2) phase, which is rather rare, is provided. The mesophases have been characterized using polarized light microscopy, differential scanning calorimetry, X-ray diffraction and electro-optical studies.
报告了在一个臂中含有一个氟取代基的非对称五环弯曲核化合物的合成和介观性质。与具有两个氟取代基的对称化合物的性质比较表明,该取代基的位置对观察到的介相性质有影响。研究还提供了从矩形柱状(B1)相向反铁电层状(B2)相过渡的证据,这种过渡相当罕见。利用偏光显微镜、差示扫描量热法、X 射线衍射和电光研究对介相进行了表征。
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