光活性的锆基金属-有机框架材料（Zr-MOFs）由于具有较好的稳定性和结构的多样性在可见光驱动的光催化CO2还原方面具有较好的应用。然而，现在的体系主要集中于卟啉或者氨基的Zr-MOFs。此外，Zr-MOFs普遍存在的问题是CO2的吸附能力较弱，这限制了性能的提高。本项目将与CO2具有较好相互作用且在可见光区域具有较好光吸收能力的5,11-二氢吡咯并[3,2-b]咔唑基团引入到Zr-MOFs，并探究Zr-MOFs光催化CO2还原性能。同时，5,11-二氢吡咯并[3,2-b]咔唑含有NH基团，与溴化物反应可以合成不同官能团修饰的羧酸配体，进而与锆离子自组装构筑一系列Zr-MOFs，实现从分子层面调节Zr-MOFs的性能，进而筛选出性能优异的材料。此外，由于采用了具有类似结构的羧酸配体，Zr-MOFs很可能具有相同拓扑结构的，可以作为研究平台来探究构效关系，进一步指导新材料的制备。

The photoactive zirconium metal-organic frameworks (Zr-MOFs) showed excellent potential application for photocatalytic carbon dioxide (CO2) reduction owing to their high stability and structural diversity. However, most of the Zr-MOFs as photocatalysis used for CO2 reduction are based on porphyrin or amino functional groups. Besides, Zr-MOFs usually showed less CO2 uptake capacity, which also limited their efficiency in CO2 reduction. In this project, we proposed the introduction of 5,11-dihydroindolo[3,2-b]carbazole unit into Zr-MOFs for photocatalytc CO2 reduction considering that the strong interactions between 5,11-dihydroindolo[3,2-b]carbazole functional group and CO2 molecular and the excellent visible light adsorption ability of 5,11-dihydroindolo[3,2-b]carbazole unit. Meanwhile, the NH motifs can react with different organic bromides for the synthesis of 5,11-dihydroindolo[3,2-b]carbazole decorated with different functional groups. These ligands will be used for synthesis of a series of Zr-MOFs decorated with different functional groups with the expectation of fine performance modulation from molecular level and Zr-MOFs will excellent performance will be screened out. Besides, these Zr-MOFs may possess same topology owing to their similar structure, which can be used as an excellent platform for structure-function relationship study and further guide the synthesis for new materials as photocatalysis for CO2 reduction.