As one of the most direct methods to construct molecular scaffolds in fine chemicals, C–H bond oxidation is a hot research area in catalysis. One-dimensional covalent organic frameworks (1D-COFs) developed recently have attracted growing attention for catalytic applications owing to their unique edge microstructure. Herein, a novel crystalline 1D-COF (FZU-66) was constructed and further decorated with cobalt(II), which led to excellent heterogeneous catalytic performance in the C–H bond oxidation of ethylbenzene. In an aqueous solution at room temperature within 16 h, the conversion is nearly 100%, while the acetophenone selectivity is around 99%. More impressively, the designed single-dispersed cobalt(II)-coordinated 1D-COF (FZU-66-Co) retained good catalytic activity while maintaining high crystallinity after at least five consecutive recycling experiments. This work will prompt the application of porous polymers in the catalyzed oxidation of C–H bonds and make it an efficient and sustainable platform for activating C–H bonds of aromatic hydrocarbons.

中文翻译：

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新型钴(II)修饰的一维共价有机框架用于乙苯的选择性氧化

C-H键氧化作为精细化学品中构建分子支架最直接的方法之一，是催化领域的热点研究领域。最近开发的一维共价有机框架（1D-COF）由于其独特的边缘微观结构而在催化应用中引起了越来越多的关注。在此，构建了一种新型结晶1D-COF（FZU-66），并进一步用钴（II）修饰，在乙苯的C-H键氧化中表现出优异的多相催化性能。在室温下的水溶液中，16小时内转化率接近100%，而苯乙酮的选择性约为99%。更令人印象深刻的是，所设计的单分散钴（II）配位1D-COF（FZU-66-Co）在至少五次连续回收实验后保留了良好的催化活性，同时保持了高结晶度。这项工作将促进多孔聚合物在C-H键催化氧化中的应用，并使其成为激活芳烃C-H键的高效且可持续的平台。