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Ferroelectric low-voltage ON/OFF switching of chiral benzene-1,3,5-tricarboxamide derivative
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-07-04 , DOI: 10.1039/d0tc02414g Jianyun Wu 1, 2, 3, 4 , Takashi Takeda 1, 2, 3, 4, 5 , Norihisa Hoshino 1, 2, 3, 4, 5 , Tomoyuki Akutagawa 1, 2, 3, 4, 5
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-07-04 , DOI: 10.1039/d0tc02414g Jianyun Wu 1, 2, 3, 4 , Takashi Takeda 1, 2, 3, 4, 5 , Norihisa Hoshino 1, 2, 3, 4, 5 , Tomoyuki Akutagawa 1, 2, 3, 4, 5
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The phase transition behaviour, molecular assemblies, and dielectric responses of an N,N′,N′′-trialkylbenzene-1,3,5-tricarboxamide derivative bearing chiral (S)-3,7-dimethyloctyl chains (S-3BC) were compared with those of an N,N′,N′′-trioctadecylbenzene-1,3,5-tricarboxamide derivative (3BC) bearing achiral –CONHC14H29 chains. Chiral S-3BC showed a similar phase transition behaviour to achiral 3BC, and ferroelectric polarization–electric field (P–E) hysteresis curves were observed in the discotic hexagonal columnar (Colh) liquid crystal phase. Interestingly, the magnitudes of Pr and Et values of S-3BC were 5.5-times larger and 13-times smaller than those of 3BC because of the introduction of the chiral alkyl chains, indicating a useful method to obtain low voltage ON/OFF ratios for the switching device. Much stronger N–H⋯O![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
hydrogen-bonding interactions were observed in S-3BC than in 3BC because of much shorter π-stacking distance and blue-shift of the intermolecular asymmetrical N–H vibrational band in the former, which effectively decreased the potential energy barrier for the dipole inversion between N–H⋯O and O⋯H–N orientations and the Et value.
中文翻译：
手性苯-1,3,5-三羧酸酰胺衍生物的铁电低压开/关切换
带有手性（S）-3,7-二甲基辛基链（S -3BC）的N，N '，N ''-三烷基苯-1,3,5-三芳酰胺衍生物的相变行为，分子组装和介电响应为与那些的比较ñ，ñ '，ñ '-trioctadecylbenzene -1,3,5-三甲酰胺衍生物（3BC）轴承非手性-CONHC 14支ħ 29链。手性小号-3BC显示出类似的相变行为以非手性3BC，和铁电性极化-电场（P -在盘状六方柱状（Col h）液晶相中观察到E）磁滞曲线。有趣的是，的幅度P - [R和Ë吨的值小号-3BC分别为5.5倍比的较大和较小的13倍3BC因为引入手性烷基链组成，指示一种有用的方法，以获得低电压ON / OFF开关设备的比率。强得多N-H⋯ö中观察到氢键相互作用小号-3BC比3BC由于前者的分子间非对称N–H振动带的π堆积距离更短且发生蓝移，这有效地减小了N–H⋯O和O⋯H–N取向之间偶极子反演的势能垒。所述ë吨值。
更新日期：2020-08-06
hydrogen-bonding interactions were observed in S-3BC than in 3BC because of much shorter π-stacking distance and blue-shift of the intermolecular asymmetrical N–H vibrational band in the former, which effectively decreased the potential energy barrier for the dipole inversion between N–H⋯O and O⋯H–N orientations and the Et value.
中文翻译：
手性苯-1,3,5-三羧酸酰胺衍生物的铁电低压开/关切换
带有手性（S）-3,7-二甲基辛基链（S -3BC）的N，N '，N ''-三烷基苯-1,3,5-三芳酰胺衍生物的相变行为，分子组装和介电响应为与那些的比较ñ，ñ '，ñ '-trioctadecylbenzene -1,3,5-三甲酰胺衍生物（3BC）轴承非手性-CONHC 14支ħ 29链。手性小号-3BC显示出类似的相变行为以非手性3BC，和铁电性极化-电场（P -在盘状六方柱状（Col h）液晶相中观察到E）磁滞曲线。有趣的是，的幅度P - [R和Ë吨的值小号-3BC分别为5.5倍比的较大和较小的13倍3BC因为引入手性烷基链组成，指示一种有用的方法，以获得低电压ON / OFF开关设备的比率。强得多N-H⋯ö
中观察到氢键相互作用小号-3BC比3BC由于前者的分子间非对称N–H振动带的π堆积距离更短且发生蓝移，这有效地减小了N–H⋯O和O⋯H–N取向之间偶极子反演的势能垒。所述ë吨值。
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