Symmetric bent-core mesogens with m-carborane and adamantane as the central units
Symmetric bent-core mesogens with m-carborane and adamantane as the central units
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DOI：
10.1039/b719629f
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发表时间：
2008-06
影响因子：
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通讯作者：
D. Pociecha;K. Ohta;A. Januszko;P. Kaszyński;Y. Endo
中科院分区：
文献类型：
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作者：
D. Pociecha;K. Ohta;A. Januszko;P. Kaszyński;Y. Endo
本文合成了两个系列的对称的、以间碳硼烷或金刚烷（1[n]或2[n]，n = 9-13）为中心的类金刚烷化合物，并用光学、量热、X射线衍射和电光等方法进行了研究。结果表明，m-碳硼烷系列的两个最短成员1[9]和1[10]表现出插层层状B6相。金刚烷衍生物2[9]-2 13]显示出单向弱双折射软结晶或具有纯手性结构域的结晶相。两个相在电场中都不发生极化切换。
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.