Two new mesophases, a longitudinally correlated and a noncorrelated (columnar) hexagonal phase, were obtained for a polyphilic bolaamphiphile with laterally attached swallow-tail chains; the unique feature of these mesophases, which makes them distinct from previously reported LC phases, is the organization of rod-like units in bundles parallel to the column axis.
Distinct Columnar and Lamellar Liquid Crystalline Phases Formed by New Bolaamphiphiles with Linear and Branched Lateral Hydrocarbon Chains
A universal building block for the convergent synthesis of a wide variety of different T-shaped ternary amphiphiles was developed and used for the synthesis of a series of new liquid-crystalline materials composed of a rigid biphenyl core with polar glycerol groups at both ends and linear or branched alkyl chains in a lateral position. In addition, compounds with bulky achiral (2,4,6-trimethylphenoxy
Axial-Bundle Phases − New Modes of 2D, 3D, and Helical Columnar Self-Assembly in Liquid Crystalline Phases of Bolaamphiphiles with Swallow Tail Lateral Chains
rhombohedral R ̄3m symmetry. The bundles are embedded in the matrix of the lateral chains, which is divided into fluoroalkyl- and aliphatic-rich regions. In the 2D columnar phase the fluorinated regions take the form of either straight columns running along the edges of the hexagonal Voronoi cells or, for compounds with a higher degree of fluorination, fuse to a hexagonalhoneycomb enclosing the aromatic
两个系列的多亲分子,由刚性和线性对三联苯核组成,两端带有能够形成氢键的极性甘油基团,以及两条支链燕尾型侧链,由一个氟化和一个非氟化支链或两个氟化支链组成通过差示扫描量热法、偏光显微镜和 X 射线衍射 (XRD) 合成并研究了分支,并研究了它们在热致液晶 (LC) 相中的自组装。至少在最高温度下,所有分子都形成六方柱状相。在这些相中,柱子由芳香棒核和脂肪壳组成。芳香棒形成旋转平均并平行于柱长轴的束。这种独特的组织已通过不同的光学和 XRD 方法得到证实。棒束内的芳香族和甘油基团被隔离成交替的片段。根据温度和分子结构,这种周期性的长程柱间相关性可能发生,导致具有菱面体 R ̄3m 对称性的 3D 有序 LC 相。这些束嵌入侧链的基质中,该基质分为富含氟烷基和脂肪族的区域。在 2D 柱状相中,氟化区域采用沿六边形 Voronoi 单元边缘延伸的直柱形式,或者对于具有较高氟化度的化合物,融合为包围芳香核的六边形蜂窝。