Bifunctional Heterometallic Metal-Organic Frameworks for Solvent-Free Heterogeneous Cascade Catalysis

文献类型： 外文期刊

第一作者： Zheng, Mingming

作者： Zheng, Mingming;Zheng, Mingming;Wang, Yanxiang;Feng, Pingyun

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关键词： heterometallic metal-organic frameworks; open metal sites; bifunctionalized catalyst; solvent-free; 3D porous; tandem reactions

期刊名称：CATALYSTS （ 影响因子：4.146； 五年影响因子：4.399 ）

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年卷期： 2020 年 10 卷 3 期

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收录情况： SCI

摘要： A family of heterometallic metal-organic frameworks (MOFs) (CPM200s) harmoniously coexisting as Lewis acids and base (azo) sites were prepared. Seven CPM200s were employed as multifunctional heterogeneous cascade catalysts for the one-pot deacetalization-Knoevenagel reaction in a solvent-free system. Benefiting from the cooperation between Lewis acids from the open metal sites and base sites from the ligands, the CPM200s showed high activity and selectivity for the tandem reaction. The heterometallic 3D porous framework reported here not only offers a combination of two opposite active sites in the same framework of materials but also increases mass transfer of the substrate, thus maximizing the efficiency and substrate selectivity of the bifunctional catalysts. The CPM200s showed the highest turnover frequency (TOF), outperforming that of the reported MOFs in tandem with the deacetalization-Knoevenagel reaction. A strong correlation between the TOF and charge-to-radius ratio (z/r) of metal ions in the CPM200s was observed for the first time. The bifunctional CPM200s catalysts can be reused five times without significant loss of activity.

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