Two- and three-dimensional liquid-crystal phases from axial bundles of rodlike polyphiles: segmented cylinders, crossed columns, and ribbons between sheets.
Two- and three-dimensional liquid-crystal phases from axial bundles of rodlike polyphiles: segmented cylinders, crossed columns, and ribbons between sheets.
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来自棒状亲聚体轴向束的二维和三维液晶相：分段圆柱体、交叉柱体和片材之间的带状体。
DOI：
10.1002/anie.201103303
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Liu F
中科院分区：
文献类型：
--
作者：
Liu F
近年来，设计程序化分子组装成复杂的纳米结构受到了相当大的关注。[1-3]一种成功的方法来复杂的软物质已经实现了与多亲性星形分子，聚合物[4]和分子。[3，5，6] T形bola两亲物特别提供了一系列新颖的蜂窝状液晶（LC）形态（图1a，B）。在这些蜂窝中，棒状单元形成多边形的圆柱框架，末端氢键基团融合圆柱壁，柔性侧链填充细胞内部（图1a，B）。[3]通过添加与第一侧链不相容的第二个侧链[7]，我们最近获得了基于周期性重复排列模式的新结构。有些是前所未有的复杂性，有几种不同的形状和“颜色”的瓷砖。[8，9]然而，增加侧链体积导致层状相（图1c）[10]，并且通过引入分支，导致蜂窝的反转，柱芯现在被与柱同轴的芳香棒束占据（图1d）。[11本文报道了一种新型的bola两亲物（1，Scheme 1），其侧链上有两个不相容的支链，半全氟（RF）和碳硅烷（RSi）。对于这种化合物，随着温度的降低，发现了三个新的LC相，每个相都具有有趣的结构：具有相关调制柱的六边形3D相，具有交叉柱的3D相，以及具有层间柱的相。化合物1（参见合成的支持信息）[13]显示了这三个稳定的LC相（方案1），它们被可逆跃迁分开。在从各向同性液体冷却时，球晶织构发展，典型的柱状LC（图2a）。所有中间相具有正双折射，如通过具有l-延迟器的偏光显微镜所证实。风扇的颜色（图2c，中间）显示慢轴的方向是切向的，而不是
The design of programmed molecules for assembly into complex nanostructures has received considerable attention in recent years.[1–3] One successful approach to complex soft matter has been achieved with polyphilic star-shaped molecules, both polymeric [4] and molecular.[3, 5, 6] T-shaped bolaamphiphiles in particular provide a series of novel honeycomb liquid-crystal (LC) morphologies (Figure1a, b). In these honeycombs rodlike units form polygonal cylinder frames, with the terminal hydrogen-bonding groups fusing the cylinder walls and the flexible lateral chains filling the cell interior (Figure 1 a, b).[3] By adding a second side chain [7] incompatible with the first, we recently obtained new structures based on periodic multicolor tiling patterns. Some are of unprecedented complexity, with tiles of several different shapes and “colors”.[8, 9] However, increasing the sidechain volume leads to lamellar phases (Figure 1c)[10] and, by introducing branches, to inversion of the honeycombs, with the column core now inhabited by bundles of aromatic rods coaxial with the columns (Figure 1d).[11, 12] Herein we report a new type of bolaamphiphile (1, Scheme1) having a lateral chain with two incompatible branches, a semiperfluorinated (RF) and a carbosilane one (RSi). For this compound, three new LC phases were discovered with decreasing temperature, each with an intriguing structure: a hexagonal 3D phase with correlated modulated columns, a 3D phase with crossed columns, and a phase with columns between layers. Compound 1 (see the Supporting Information for the synthesis)[13] shows these three stable LC phases (Scheme 1) separated by reversible transitions. On cooling from the isotropic liquid, a spherulitic texture develops, typical of columnar LC (Figure2a). All mesophases have positive birefringence as confirmed by polarizing microscopy with a l-retarder. The colors of the fans (Figure 2c, middle) reveal the orientation of the slow axis as tangential rather than
影响因子：
4.9
作者：
R. Kieffer;M. Prehm;Benjamin Glettner;K. Pelz;U. Baumeister;Feng Liu;X. Zeng;G. Ungar;C. Tschie
通讯作者：
R. Kieffer;M. Prehm;Benjamin Glettner;K. Pelz;U. Baumeister;Feng Liu;X. Zeng;G. Ungar;C. Tschie
影响因子：
16.6
作者：
Glettner, Benjamin;Liu, Feng;Tschierske, Carsten
通讯作者：
Tschierske, Carsten
影响因子：
15
作者：
Prehm, Marko;Liu, Feng;Tschierske, Carsten
通讯作者：
Tschierske, Carsten