Covalent organic frameworks enable the topological connection of organic chromophores into π lattices, making them attractive for creating light-emitting polymers that are predesignable for both the primary- and high-order structures. However, owing to linkages, covalent organic frameworks are either unstable or poor luminescent, leaving the practical synthesis of stable light-emitting frameworks challenging. Here, we report the designed synthesis of sp² carbon-conjugated frameworks that combine stability with light-emitting activity. The C=C linkages topologically connect pyrene knots and arylyenevinylene linkers into two-dimensional all sp² carbon lattices that are designed to be π conjugated along both the x and y directions and develop layer structures, creating exceptionally stable frameworks. The resulting frameworks are capable of tuning band gap and emission by the linkers, are highly luminescent under various conditions and can be exfoliated to produce brilliant nanosheets. These results suggest a platform based on sp² carbon frameworks for designing robust photofunctional materials.

中文翻译：

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设计合成稳定的发光二维sp2碳共轭共价有机骨架。

共价有机骨架可将有机生色团拓扑连接成π晶格，从而使其对于创建可针对一级和高级结构预先设计的发光聚合物具有吸引力。然而，由于键合，共价有机框架要么不稳定要么发光性差，这给稳定的发光框架的实际合成带来了挑战。在这里，我们报告结合稳定性与发光活性的sp ²碳共轭框架的设计合成。C = C键将pyr结和芳基亚乙烯基连接体拓扑连接成二维的全部sp ²碳晶格设计成沿x和y方向共轭π并形成层结构，从而形成格外稳定的框架。所得的骨架能够调节带隙和连接基团的发射，在各种条件下都具有高发光性，并且可以剥落以产生光亮的纳米片。这些结果表明，基于sp ²碳框架的平台可用于设计坚固的光功能材料。