On the basis of the global warming effect, it is of great significance to convert CO₂ into the high value-added products oxazolidinones, but investigations on main-group-based metal–organic frameworks (MOFs) as heterogeneous catalysts still have not been reported so far. In this work, a quadruple-interpenetrated porous indium-based MOF, {[NH₂(CH₃)₂][In(CPT)₂]·3CH₃CN·3DMA}_n (1), is constructed from the organic ligand 3,5-bis(4′-carboxyphenyl)-1,2,4-triazole through solvothermal reactions, and N₂ adsorption proves that the framework has a high Brunauer–Emmett–Teller surface areas with 2024 m²/g. The catalytic research on CO₂ conversion reveals that compound 1 has high reactivity for the cycloaddition of CO₂ with aziridines, and the product 3-ethyl-5-phenyloxazolidin-2-one can be obtained with a yield of 99% under mild conditions. In addition, 1 exhibits excellent activity for different kinds of substrates and can be reused at least five cycles without any significant deactivation, suggesting that 1 is a potential candidate for the chemical conversion of CO₂ and aziridines. Mechanistic explorations indicate that the high efficiency of 1 is attributed to the indium center in the framework as a Lewis acid site, and the large porosity can enrich substrates. Importantly, 1 behaved as the first main-group MOF-based catalyst in the reported coupling reaction of CO₂ with aziridines.

中文翻译：

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四重互穿铟-有机骨架作为可回收催化剂活化的 CO2 和氮丙啶的有效环加成

基于全球变暖效应，将CO ₂转化为高附加值产品恶唑烷酮具有重要意义，但基于主族的金属有机骨架（MOFs）作为多相催化剂的研究尚未见报道迄今为止。在这项工作中，由有机配体 3 构建了四重互穿多孔铟基 MOF，{[NH ₂ (CH ₃ ) ₂ ][In(CPT) ₂ ]·3CH ₃ CN·3DMA} _n ( 1 ) ,5-双(4'-羧基苯基)-1,2,4-三唑通过溶剂热反应和N ₂吸附证明该框架具有2024 m ²的高Brunauer-Emmett-Teller表面积/G。CO ₂转化催化研究表明，化合物1对CO ₂与氮丙啶的环加成反应具有较高的反应活性，在温和条件下可以以99%的收率得到产物3-乙基-5-苯基恶唑烷-2-one。此外，1对不同种类的底物表现出优异的活性，并且可以重复使用至少五个循环而没有任何显着的失活，这表明1是 CO ₂和氮丙啶化学转化的潜在候选者。机理探索表明，1归因于框架中的铟中心作为路易斯酸位点，大孔隙率可以丰富基材。重要的是，在报道的CO ₂与氮丙啶的偶联反应中，1充当了第一个基于主族MOF 的催化剂。