Molecular shape as a means to control the incidence of the nanostructured twist bend phase†,Soft Matter

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Molecular shape as a means to control the incidence of the nanostructured twist bend phase†
Soft Matter ( IF 2.9 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1039/c7sm02364b
Emily E. Pocock _{1,

2,

3} , Richard J. Mandle _{1,

2,

3} , John W. Goodby _{1,

2,

3}

Affiliation

Liquid crystalline phases with a spontaneous twist-bend modulation are most commonly observed for dimers and bimesogens with nonamethylene spacers. In order to redress this balance we devised a simple chemical intermediate that can be used to prepare unsymmetrical bimesogens; as a proof of concept we prepared and studied eleven novel materials with all found to exhibit the twist-bend phase and exhibit a linear relationship between TN-I and TTB-N. A computational study of the conformational landscape reveals the octamethyleneoxy spacer to have a broader distribution of bend-angles than the nonamethylene equivalent, leading to reductions in the thermal stability of the TB phase. This result indicates that a tight distribution of bend-angles should stabilise the TB phase and lead to direct TB-Iso phase transitions, and conversely a broader distribution should destabilise the TB phase which may allow new states of matter that are occluded by the incidence of this phase to be revealed.

中文翻译：

分子形状是控制纳米结构扭曲弯曲相†发生率的一种手段

对于具有九亚甲基间隔基的二聚体和双生源体，最常观察到具有自发扭曲弯曲调节的液晶相。为了纠正这种平衡，我们设计了一种简单的化学中间体，可用于制备不对称的双歧杆菌。作为概念的证明，我们准备并研究了11种新颖材料，所有材料均表现出扭曲弯曲相，并且在TN-I和TTB-N之间呈线性关系。对构象态势的计算研究表明，八亚甲基氧基间隔基比九亚甲基等效基具有更大的弯曲角分布，从而导致TB相的热稳定性降低。该结果表明，弯曲角度的紧密分布应能稳定TB相并导致直接的TB-Iso相变，

更新日期：2018-03-12

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