derivatives. (Cyanoethyl)cyclohexyl cyclohenxanoates show mesmorphic properties in contrast to the corresponding cyano derivative. Separation of the cyano substituent from the rigid core of an anisotropic aliphatic compound by methylene groups enhances the thermodynamic stability of the mesophase. In aromatic compound, the cyanoethyl group leads to lower clearing points. These phenomena are attributed to teh
合成了
氰基取代的环己基环
己酸酯,双(
环己烷)和苯基
环己烷。将它们的同晶行为与相应的
氰基衍
生物的同晶行为进行比较。与相应的
氰基衍
生物相反,(
氰乙基)环己基环
己酸酯具有同晶型性质。通过亚甲基将
氰基取代基与各向异性脂族化合物的刚性核分离,可以增强中间相的热力学稳定性。在芳族化合物中,
氰基乙基导致较低的透明点。这些现象归因于空间效应对堆积密度的影响以及清除点对分子缔合的依赖性。