Symmetric bent-core mesogens with m-carborane and adamantane as the central units
作者:Damian Pociecha、Kiminori Ohta、Adam Januszko、Piotr Kaszynski、Yasuyuki Endo
DOI:10.1039/b719629f
日期:——
Several members of two homologous series of symmetric bent-shaped compounds with either m-carborane or adamantane (1[n] or 2[n], n = 9–13) in the central position were synthesized and investigated by optical, calorimetric, X-ray diffraction, and electro-optical methods. Results show that the two shortest members of the m-carborane series, 1[9] and 1[10], exhibit an intercalated lamellar B6 phase. The adamantane derivatives 2[9]–2[13] display a monotropic weakly birefringent soft crystalline or crystalline phase with homochiral domains. Neither phase undergoes polarization switching in an electric field.
研究人员合成了两个同源系列的对称弯曲形化合物,其中心位置为间碳酸硼烷或金刚烷(1[n]或 2[n],n = 9-13),并采用光学、量热、X 射线衍射和电光方法对这些化合物进行了研究。结果表明,间碳硼烷系列中最短的两个成员 1[9] 和 1[10] 呈现出夹层片状 B6 相。金刚烷衍生物 2[9]-2[13] 则显示出单向性的弱双折射软结晶或结晶相,具有同手性结构域。这两种相在电场中都不会发生极化转换。