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Swallow‐Tailed Polycatenars: Controlling Complex Liquid Crystal Self‐Assembly and Mirror Symmetry Breaking at the Lamellae‐Network Cross‐Over
Advanced Optical Materials ( IF 9 ) Pub Date : 2020-11-25 , DOI: 10.1002/adom.202001572 Tino Reppe 1 , Christian Dressel 1 , Silvio Poppe 1 , Alexey Eremin 2 , Carsten Tschierske 1
Advanced Optical Materials ( IF 9 ) Pub Date : 2020-11-25 , DOI: 10.1002/adom.202001572 Tino Reppe 1 , Christian Dressel 1 , Silvio Poppe 1 , Alexey Eremin 2 , Carsten Tschierske 1
Affiliation
Controlling the spatial organization of π‐conjugated molecules in soft systems is of importance for the design of new materials with application relevant optimized properties. Here, soft self‐assembly of functional multi‐chained π‐conjugated 5,5′‐diphenyl‐2,2′‐bithiophenes is investigated. Focus is on molecules with a 3,5‐disubstitution pattern at one end and no or only a single chain at the other end. By elongation of the single terminal chain, a transition from lamellar phases to helical networks is observed. With lowering the temperature, the lamellar phase types change from smectic via hexatic to crystalline. In some cases, different kinds of orders are combined in a single uniform lamellar structure. Moreover, a transition from uniform (synclinic) to alternating (anticlinic) tilt in adjacent layers is observed with decreasing chain length or rising temperature, due to a change of the molecular conformation from tuning fork like to Y‐shaped. For compounds terminated with a long chain, helical self‐assembly of the π‐conjugated rods in networks takes place, leading either to a racemic ( , gyroid) or a spontaneous mirror symmetry broken (I23) bicontinuous cubic phase and a chiral isotropic liquid phase (Iso1[*]) as well. This work establishes rules for controlling the self‐assembly of functional π‐conjugated rods in soft matter and fluids.
中文翻译:
燕尾式多类别:控制复杂的液晶自组装和镜像对称性,以突破薄片网络交叉
在软系统中控制π共轭分子的空间组织对于设计具有与应用相关的优化特性的新材料非常重要。在这里,研究了功能性多链π共轭的5,5'-联苯-2,2'-联噻吩的软自组装。重点是在一端具有3,5-二取代模式而在另一端没有或只有一条链的分子。通过延长单末端链,观察到从层状相到螺旋网络的过渡。随着温度的降低,层状相的类型从近晶经六方转变为结晶。在某些情况下,将不同种类的订单合并为一个均匀的层状结构。此外,由于分子构象从音叉状转变为Y形,随着链长的减小或温度的升高,在相邻层中观察到了从均匀(倾斜)到交替(倾斜)倾斜的过渡。对于以长链终止的化合物,π共轭棒在网络中发生螺旋自组装,导致外消旋(,螺旋状)或自发的对称对称破碎(I 23)双连续立方相和手性各向同性液相(Iso 1 [ * ])。这项工作建立了控制软物质和流体中功能性π共轭棒自组装的规则。
更新日期:2021-01-18
中文翻译:
燕尾式多类别:控制复杂的液晶自组装和镜像对称性,以突破薄片网络交叉
在软系统中控制π共轭分子的空间组织对于设计具有与应用相关的优化特性的新材料非常重要。在这里,研究了功能性多链π共轭的5,5'-联苯-2,2'-联噻吩的软自组装。重点是在一端具有3,5-二取代模式而在另一端没有或只有一条链的分子。通过延长单末端链,观察到从层状相到螺旋网络的过渡。随着温度的降低,层状相的类型从近晶经六方转变为结晶。在某些情况下,将不同种类的订单合并为一个均匀的层状结构。此外,由于分子构象从音叉状转变为Y形,随着链长的减小或温度的升高,在相邻层中观察到了从均匀(倾斜)到交替(倾斜)倾斜的过渡。对于以长链终止的化合物,π共轭棒在网络中发生螺旋自组装,导致外消旋(,螺旋状)或自发的对称对称破碎(I 23)双连续立方相和手性各向同性液相(Iso 1 [ * ])。这项工作建立了控制软物质和流体中功能性π共轭棒自组装的规则。