In this study, a new strategy to establish a 3D local connection of building synthons and tune the functionalities of 2D covalent organic frameworks (COFs) was developed via in situ incorporation of multi-branched building blocks during the synthesis of COFs. The new COF material CPF-3 retains the features including surface area, crystallinity and stability of the pristine 2D COF COF-LZU1 and expands the light absorption range to the visible-light region via incorporation of accessible photoactive porphyrin sites with the 3D local connection. The Sn(IV)-metalated COF material Sn-CPF-3 exhibits high photocatalytic efficiency and selectivity in aerobic oxidation of sulfides to produce highly value-added sulfoxides with up to 23 334 turnovers and 648 h⁻¹ turnover frequency under visible light irradiation.

中文翻译：

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用多分支光敏部分调节2D共价有机骨架的孔结构和光催化性能。

在这项研究中，通过在合成COF的过程中原位引入多支链结构单元，开发了一种建立建筑合成子的3D局部连接并调整2D共价有机框架（COF）功能的新策略。新型COF材料CPF-3保留了原始2D COF COF-LZU1的表面积，结晶度和稳定性等功能，并通过将可访问的光敏卟啉部位与3D局部连接相结合，将光吸收范围扩展至可见光区域。Sn（IV）金属化的COF材料Sn-CPF-3在可见光照射下，在硫化物的需氧氧化中显示出高的光催化效率和选择性，以产生高附加值的亚砜，其具有高达23 334的转换和648 h ^-1的转换频率。