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首页> 外文期刊>Chemistry: A European journal >Dependence of Mesomorphic Behaviour of Methylene-Linked Dimers and the Stability of the N-TB/N-X Phase upon Choice of Mesogenic Units and Terminal Chain Length
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Dependence of Mesomorphic Behaviour of Methylene-Linked Dimers and the Stability of the N-TB/N-X Phase upon Choice of Mesogenic Units and Terminal Chain Length

机译：亚甲基连接二聚体的同构行为和N-TB / N-X相的稳定性取决于介晶单位和末端链长的选择

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摘要

Twelve symmetrical dimeric materials consisting of a nonamethylene (C9) spacer and either phenyl 4-(4'-alkylphenyl)benzoate, phenyl 4-(4'-alkylcyclohexyl)benzoate or phenyl 4-(4'-alkylbicyclohexyl)carboxylate mesogenic units were prepared and their mesogenic behaviour characterised by POM, DSC and XRD. All of the materials exhibited nematic phases with clearing points in excess of 200 degrees C. Four compounds were found to exhibit the twist-bend nematic phase, with one material exhibiting a transition from the NTB phase into an anticlinic smectic 'X' phase. Across all three series of compounds the length of terminal chain is seen to dictate, to some degree, the type of mesophase formed: shorter terminal chains favour nematic and N-TB mesophases, whereas longer terminal aliphatic chains were found to promote smectic phases.
机译：制备了十二种对称的二聚材料，它们由九亚甲基（C9）间隔基和苯基4-（4'-烷基苯基）苯甲酸酯，苯基4-（4'-烷基环己基）苯甲酸酯或苯基4-（4'-烷基双环己基）羧酸酯介晶单元组成以及以POM，DSC和XRD为特征的介晶行为。所有材料均表现出清亮点超过200摄氏度的向列相。发现四种化合物均表现出扭曲弯曲的向列相，其中一种材料表现出从NTB相到抗斜晶系“ X”相的转变。在所有这三个系列的化合物中，末端链的长度在一定程度上决定了所形成的中间相的类型：较短的末端链有利于向列相和N-TB中间相，而较长的末端脂族链则促进近晶相。

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