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首页> 外文期刊>Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology >The effect of a thiophene ring in the outer position on mesomorphic properties of the bent-shaped liquid crystals
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The effect of a thiophene ring in the outer position on mesomorphic properties of the bent-shaped liquid crystals

机译：外部噻吩环对弯曲液晶的介晶性质的影响

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摘要

Novel bent-shaped compounds with the naphthalene central core possessing an outer thiophene unit in the lengthening arm were synthesized. Mesomorphic behaviour of new materials was studied using optical polarising microscopy, DSC, and electrooptic methods. The structures of mesophases were identified by X-ray diffraction and the structural parameters established. In the case of the thiophene unit in one molecular arm (the phenyl in the opposite arm) we succeeded in obtaining mesogenic properties for all types of lateral substitutions on the central naphthalene core. All non-substituted compounds and materials with the central core substituted by CH3 or Cl exhibited the B2 phase. The B7 phase has been observed for all compounds with CN-substituted central core. Materials with the thiophene unit in both lengthening arms were not liquid crystalline except for the CN-substituted compound exhibiting the B7 phase. Mesomorphic properties of compounds with the thiophene are compared with those detected on analogous materials with the phenyl ring.
机译：合成了新型的弯曲型化合物，其萘中心核在加长臂中具有一个外部噻吩单元。使用光学偏振显微镜，DSC和电光方法研究了新材料的同构行为。通过X射线衍射鉴定中间相的结构并确定结构参数。在一个分子臂中的噻吩单元（相对臂中的苯基）的情况下，我们成功获得了中央萘核上所有类型的侧向取代基的介晶性能。所有未取代的化合物和中心被CH3或Cl取代的材料均显示B2相。已观察到所有具有CN取代的中心核的化合物的B7相。在两个加长臂中具有噻吩单元的材料不是液晶，除了具有B7相的CN取代的化合物。将具有噻吩的化合物的同构性质与在具有苯环的类似材料上检测到的那些进行了比较。

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