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The role of hydrogen bonds in the mesomorphic behaviour of supramolecular assemblies organized in dendritic architectures
Liquid Crystals Reviews ( IF 5.1 ) Pub Date : 2019-05-29 , DOI: 10.1080/21680396.2019.1621226
Michael Arkas 1 , I. Kitsou 2 , A. Gkouma 1 , M. Papageorgiou 1
Affiliation  

Dendritic polymers are artificial compounds with a unique, repeatedly branched structure inspired by the respective patterns, encountered in trees. They are recognized as the fourth major macromolecular architectural class next to linear, cross linked and branched polymers. Regarding the formation of liquid crystalline phases, they follow the same rules as all the other categories. Suitable chemical functionalization induces segregation. Secondary interactions, in the form of hydrogen bonds in particular, also play a crucial role in mesophase formation by regulating polarity fluctuations and other properties such as rigidity. As a consequence, there are some cases where liquid crystallinity is attributed exclusively to the presence of hydrogen bonding networks, whereas in many more examples mesophase formation is induced mainly due to these interactions. A survey of intra and intermolecular bond influence on the liquid crystalline character of dendritic polymers is presented. The review also covers some examples of supramolecular assemblies exhibiting architecture or incorporating elements reminiscent of trees which cannot be classified as dendritic polymers where segregation resulting by hydrogen bonding is governed by the same principles. In parallel, a description of the various mesophases observed in correlation to different hydrogen bonding patterns is included, and some general conclusions and rules are suggested.



中文翻译:

氢键在树状结构中组织的超分子组装体的同构行为中的作用

树突状聚合物是人工化合物,其独特的,重复的分支结构受树木中遇到的各种图案的启发。它们被认为是继线性,交联和支化聚合物之后的第四大主要分子建筑类别。关于液晶相的形成,它们遵循与所有其他类别相同的规则。合适的化学官能化可引起偏析。通过调节极性波动和其他性质(例如刚性),尤其是氢键形式的次级相互作用在中间相的形成中也起着至关重要的作用。因此,在某些情况下,液晶性仅归因于氢键网络的存在,而在更多例子中,中间相的形成主要是由于这些相互作用。提出了对分子内和分子间键对树枝状聚合物的液晶特性的影响的调查。这篇综述还涵盖了一些超分子组件的例子,这些组件表现出建筑学或并入了让人联想到树木的元素,这些元素无法归类为树枝状聚合物,其中氢键结合导致的分离受相同原理支配。平行地,包括与不同的氢键模式相关的各种中间相的描述,并提出了一些一般性的结论和规则。这篇综述还涵盖了一些超分子组件的例子,这些组件表现出建筑学或并入了让人联想到树木的元素,这些元素无法归类为树枝状聚合物,其中氢键结合导致的分离受相同原理支配。平行地,包括与不同的氢键模式相关的各种中间相的描述,并提出了一些一般性的结论和规则。这篇综述还涵盖了一些超分子组件的例子,这些组件表现出建筑学或并入了让人想起树木的元素,这些元素无法归类为树枝状聚合物,其中氢键键合引起的偏析受相同原理支配。平行地,包括与不同的氢键模式相关的各种中间相的描述,并提出了一些一般性的结论和规则。

更新日期:2019-05-29
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