Cruickshank Ewan, Walker Rebecca, Majewska Magdalena M, Gorecka Ewa, Pociecha Damian, Storey John M D, Imrie Corrie T
Department of Chemistry, University of Aberdeen, Old Aberdeen AB24 3UE, U.K.
Faculty of Chemistry, University of Warsaw, Zwirki i Wigury 101, Warsaw 02-089, Poland.
ACS Omega. 2025 May 27;10(22):23609-23619. doi: 10.1021/acsomega.5c02500. eCollection 2025 Jun 10.
The synthesis and characterization of 12 ferroelectric nematogens based on the RM734 structural template are reported in the form of two series named ECMe and ECMeF. Within both series, the position of the methyl groups present was varied and all 12 of these compounds exhibited the ferroelectric nematic phase. In general, when modifications were made that decreased the shape anisotropy of the molecule, the value of decreased in line with the literature. The behavior of was, however, much more complex, appearing to be directed by the substituents present, and the transition temperatures did not follow a distinct trend as modifications were made. This is particularly apparent when comparing 2ECMe and 3ECMe which both have a terminal methyl group and a lateral methoxy group: the of 3ECMe is 25 °C higher than that of 2ECMe, while their equivalent methoxy-substituted materials have transition temperatures essentially identical to one another. The properties of these materials can be justified, in general, by the model of Madhusudana and are sensitive to the electronic distribution within the compounds.
报道了基于RM734结构模板的12种铁电向列相液晶的合成与表征，它们以名为ECMe和ECMeF的两个系列形式呈现。在这两个系列中，甲基的位置有所不同，且所有这12种化合物均呈现铁电向列相。一般来说，当进行的修饰降低了分子的形状各向异性时，根据文献， 的值会降低。然而， 的行为要复杂得多，似乎由存在的取代基决定，并且随着修饰的进行，转变温度并未遵循明显的趋势。当比较均具有末端甲基和侧链甲氧基的2ECMe和3ECMe时，这一点尤为明显：3ECMe的 比2ECMe高25℃，而它们的等效甲氧基取代材料的转变温度基本相同。总体而言，这些材料的性质可以用Madhusudana模型来解释，并且对化合物内的电子分布敏感。
