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首页> 外文期刊>Chemistry: A European journal >Synthesis and NaOTf Mediated Self-Assembly of Monodendritic Crown Ethers
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Synthesis and NaOTf Mediated Self-Assembly of Monodendritic Crown Ethers

机译：单枝树冠醚的合成及NaOTf介导的自组装

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摘要

The synthesis of ten benzylether based self-assembling monodendrons containing benzo[15]crown-5 at their focal point is presented. These dendritic building blocks self-assemble either directly or via complexation with NoOTf in two-dimensional smectic B, smectic A, and p6mm hexagonal columnar (#PHI#_h) and three-dimensional Pm3n cubic lattices. Retrostructural analysis of these lattices and of the lattices generated from the same monodendrons containing various other functional groups at their focal point by X-ray diffraction experiments provided for the first time a correlation between the molecular structure and the shape of the monodendron, the shape of the supramolecular dendrimer and the symmetry of the lattice. It has been shown that complexation with NaOTf provides the following five different trends: a) stabilization fo the three-dimensional Pm3n cubic lattice self-organized from spherical dendrimers that are self-assembled from conic monodendrons; b) stabilization of the two-dimensional S_A phase generated from parallelepiped monodendrons; c) no effect on the stability of the two-dimensional S_B phase generated from parallelepiped monodendrons; d) stabilization of the two-dimensional p6mm hexagonal columnar phase self-organized from cylindrical supramolecular dendrimers that are self-assembled from tapered monodendrons; and e) destabilization of the two-dimensional p6mm hexagonal columnar phase self-organized from cylindrical supramolecular dendrimers self-assembled from halfdics monodendrons. Mechanisms of NaOTf mediated self-assembly processes were suggested. These monodendritic crown ethers and their NaOTf complexes provide the largest diversity of liquid crystalline phases encountered so far in nay library of supramolecular dendrimers.
机译：介绍了十个以苯并[15] crown-5为基点的基于苄醚的自组装单树枝状分子的合成。这些树枝状结构单元直接自组装或通过与NoOTf络合而自组装成二维近晶B，近晶A和p6mm六角柱状（＃PHI＃_h）和三维Pm3n立方晶格。通过X射线衍射实验对这些晶格以及在相同焦点处由含有不同官能团的相同单枝分子生成的晶格进行结构分析，这首次提供了分子结构与单枝分子形状，超分子树状大分子和晶格的对称性。已经显示出与NaOTf的络合提供了以下五个不同的趋势：a）由球形树状聚合物自组织的三维Pm3n立方晶格的稳定化，所述球形树状聚合物由圆锥单枝状分子自组装。 b）稳定由平行六面体单树枝产生的二维S_A相; c）对平行六面体单树枝状结构产生的二维S_B相的稳定性没有影响; d）由圆柱形超分子树状分子自组织的二维p6mm六角形柱状相的稳定化，该分子由锥形单树枝状分子自组装而成; e）由半双单分子自组装的圆柱超分子树枝状分子自组织的二维p6mm六角形柱状相的不稳定。提出了NaOTf介导的自组装过程的机制。这些单树状冠醚及其NaOTf配合物提供了迄今为止在超分子树状大分子的任何图书馆中遇到的最大液晶相多样性。

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