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首页> 外文期刊>Chemistry: A European journal >Ligand-template directed assembly: An efficient approach for the supramolecular encapsulation of transition-metal catalysts
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Ligand-template directed assembly: An efficient approach for the supramolecular encapsulation of transition-metal catalysts

机译：配体模板定向组装：过渡金属催化剂超分子封装的有效方法

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摘要

Supramolecular encapsulation of small guest molecules inside well-defined cavities of molecular capsules has witnessed broad attention because of the unusual behaviour of these systems. The molecular capsules generally consist of rigid complementary building blocks that are held together by multiple, complementary non-covalent interactions. Interestingly, it has been shown that chemical transformations can take place inside these capsules and in some examples the reaction is accelerated, while in other cases otherwise instable intermediates could be isolated in the capsulated form. Many reactions of interest require a transition-metal (TM) catalyst, and the creation of new capsules in which such catalysts are implemented within the structure is thus required for the development of resourceful type of catalyst systems for these processes. In this concept article we will discuss new strategies to arrive at such systems, with a focus on a ligand-templated approach. In this approach, multifunctional ligands are used as templates for the encapsulation process by supramolecular building blocks and concomitantly for the formation of TM complexes that are active in catalytic processes. The obtained encapsulated transition-metal catalysts show unusual reactivity and selectivity behaviour that will be discussed in detail.
机译：由于这些系统的异常行为，小客体分子的超分子包封在分子胶囊的明确定义的腔内已引起广泛关注。分子胶囊通常由刚性的互补结构单元组成，其通过多个互补的非共价相互作用保持在一起。有趣的是，已经表明，在这些胶囊内可以发生化学转化，并且在某些示例中，反应被促进，而在其他情况下，不稳定的中间体可以以胶囊形式被分离。许多感兴趣的反应需要过渡金属（TM）催化剂，因此需要开发新的胶囊，其中在结构内实施这种催化剂，以开发用于这些方法的资源丰富的催化剂体系。在此概念文章中，我们将讨论以此类配体为模板的方法来实现此类系统的新策略。在这种方法中，多功能配体被用作模板，用于超分子构件的包封过程，并同时形成在催化过程中具有活性的TM复合物。所获得的包封的过渡金属催化剂显示出异常的反应性和选择性行为，将对此进行详细讨论。

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