Self-assembly and liquid-crystalline supramolecular organizations of semifluorinated block co-dendritic supermolecules
作者:Izabela Bury、Benoît Heinrich、Cyril Bourgogne、Georg H. Mehl、Daniel Guillon、Bertrand Donnio
DOI:10.1039/c1nj20530g
日期:——
The synthesis and self-organizing behaviour into liquid-crystalline mesophases of two libraries of segmented block co-dendrimers are described. The overall structure of the dendritic supermolecules consists of two chemically incompatible molecular moieties, covalently connected by combinatory cross-coupling reactions. One block is composed of linear perfluorinated segments (2 generations, defining
asymmetric dendrons by varying their apex functionalities and examine the packing structures of the second-generation (G2) dendritic wedges. Our work shows that weakening the hydrogen bonding of the dendron apex makes the particles softer and smaller, and leads to the formation of various FK structures at lower temperatures, including the new observation of a FK C14 phase in the cone-shaped dendron systems
单组分聚合物材料为自组装成中尺度复杂晶体结构开辟了巨大的潜力,这些结构被称为 Frank-Kasper (FK) 相。然而,即使精确知道分子设计,预测软物质球体的堆积结构仍然是一个挑战。在这里,我们研究了分子的焓相互作用在确定低对称性晶体结构中的作用。为此,我们通过改变它们的顶点功能来合成结构上不对称的树突,并检查第二代 (G2) 树突楔的堆积结构。我们的工作表明,削弱树枝状顶点的氢键会使颗粒更软更小,并导致在较低温度下形成各种 FK 结构,包括对锥形树突系统中 FK C14 相的新观察。由于粒子的界面张力和链的拉伸之间的自由能平衡,主要通过设计氢键相互作用来调整各种堆积结构。
Synthesis and Structural Analysis of Two Constitutional Isomeric Libraries of AB<sub>2</sub>-Based Monodendrons and Supramolecular Dendrimers
作者:Virgil Percec、Wook-Dong Cho、Goran Ungar、Duncan J. P. Yeardley
DOI:10.1021/ja0037771
日期:2001.2.1
self-assemble into sphericalsupramoleculardendrimers that self-organize into a Pm3n 3-D cubic lattice while the same generations of the 3,5-disubstituted series of monodendrons self-assemble into cylindrical supramoleculardendrimers that self-organize into a p6mm hexagonal columnar 2-D lattice. The internal repeat unit of the monodendrons determines the shape of the supramoleculardendrimers. However..
A series of dendritic DTPA-derived ligands and their corresponding gadolinium(III) complexes have been prepared and their spreading behaviour at the air-water interface has been investigated. The results show that these amphiphiles have the prerequisite qualities to form stable and reversible Langmuir monolayers opening the road to novel magnetic organic films. (c) 2007 Elsevier Ltd. All rights reserved.