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首页> 外文期刊>Chemistry: A European journal >Precision Construction of 2D Heteropore Covalent Organic Frameworks by a Multiple-Linking-Site Strategy
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Precision Construction of 2D Heteropore Covalent Organic Frameworks by a Multiple-Linking-Site Strategy

机译：通过多链接站点策略精确构建二维异孔共价有机骨架

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摘要

Integrating different kinds of pores into one covalent organic framework (COF) endows it with hierarchical porosity and thus generates a member of a new class of COFs, namely, heteropore COFs. Whereas the construction of COFs with homoporosity has already been well developed, the fabrication of heteropore COFs still faces great challenges. Although two strategies have recently been developed to successfully construct heteropore COFs from noncyclic building blocks, they suffer from the generation of COF isomers, which decreases the predictability and controllability of construction of this type of reticular materials. In this work, this drawback was overcome by a multiple-linking-site strategy that offers precision construction of heteropore COFs containing two kinds of hexagonal pores with different shapes and sizes. This strategy was developed by designing a building block in which double linking sites are introduced at each branch of a C-3-symmetric skeleton, the most widely used scaffold to construct COFs with homogeneous porosity. This design provides a general way to precisely construct heteropore COFs without formation of isomers. Furthermore, the as-prepared heteropore COFs have hollow-spherical morphology, which has rarely been observed for COFs, and an uncommon staggered AB stacking was observed for the layers of the 2D heteropore COFs.
机译：将不同种类的孔整合到一个共价有机骨架（COF）中，可以赋予它分层的孔隙度，从而生成一种新型的COF，即杂环COF。尽管具有同质性的COF的构造已经得到很好的发展，但是异孔COF的制造仍然面临巨大的挑战。尽管最近已经开发出两种策略来成功地从非环状结构单元构建异孔COF，但它们遭受了COF异构体的产生，这降低了这类网状材料的可预测性和可控性。在这项工作中，通过多链接位点策略克服了这一缺陷，该策略可以精确构建包含两种形状和大小不同的六边形孔的异孔COF。通过设计一个构建基块来开发此策略，在该构建基块中，C-3对称骨架的每个分支都引入了双连接位点，而C-3对称骨架是使用最广泛的支架来构造具有均匀孔隙度的COF。这种设计提供了一种一般的方法，可以精确地构建异源COF而不形成异构体。此外，所制备的杂孔COF具有中空球形形态，这对于COF很少观察到，并且在二维杂孔COF的层中观察到罕见的交错AB堆积。

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