From Liquid Crystal Polymers Containing Crown Ethers to Tapered Building Blocks Containing Crown Ethers Which Self-Assemble into Tubular Supermolecules.
From Liquid Crystal Polymers Containing Crown Ethers to Tapered Building Blocks Containing Crown Ethers Which Self-Assemble into Tubular Supermolecules.
复制标题
从含有冠醚的液晶聚合物到含有自组装成管状超分子的冠醚的锥形结构单元。
DOI：
10.1002/masy.19950960117
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发表时间：
1995
影响因子：
--
通讯作者：
G. Johansson
中科院分区：
文献类型：
--
作者：
V. Percec;G. Johansson
摘要：分子识别引导的超分子结构自组装或非共价合成以及分子识别引导的过渡态自组装或自合成是超分子化学领域中两个最活跃的研究课题。我们关注的是最简单的内受体的使用，即，冠醚中两类体系的设计。第一种是通过冠醚内受体由分子识别过程进行外部调节的系统。该系统是基于各种类型的液晶聚合物，其表现出的相变是由冠醚在其重复单元的不同部分与金属盐的可逆络合操作。从这些实验中获得的信息，然后利用在第二组系统的设计。这包括自组装的构建块，其含有作为内受体的冠醚和作为外受体的锥形基团的各种组合。在与金属盐络合后，这些结构单元自组装成管状超分子结构。因此，虽然第一个系统表现出分子识别定向相变，第二个自组装成管状超分子结构通过各种分子识别过程。这些管状的超分子结构显示出热致六角柱状（φ h）液晶相，这使得自组装超分子结构的结构能够通过X射线衍射实验来确定。JG
Abstract : Molecular recognition directed self-assembly of supramolecular architectures or noncovalent synthesis, and molecular recognition directed self-assembly of transition states or self-synthesis, are two of the most active topics of research in the area of supramolecular chemistry. We are concerned with the use of the simplest endo-receptor i.e., crown ether in the design of two classes of systems. The first one is a system which is externally regulated by molecular recognition processes via a crown ether endo-receptor. This system is based on various classes of liquid-crystalline polymers which exhibit phase transitions that are manipulated by the reversible complexation of the crown ether present in different parts of their repeat unit with metal salts. The information gained from these experiments is then exploited in the design of the second group of systems. This consists of self-assembling building blocks containing various combinations of crown ether as endo-receptor and a tapered group as exo-receptor. Upon complexation with metal salts, these building blocks self-assemble into tubular supramolecular architectures. Therefore, while the first system exhibits molecular recognition directed phase transitions, the second one self-assembles into tubular supramolecular architectures via various molecular recognition processes. These tubular supramolecular architectures display a thermotropic hexagona columnar (phi h) liquid crystalline phase, which enables the structure of the self-assembled supramolecular architecture to be determined by X-ray diffraction experiments. jg