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。