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A stable 3D Sr-MOF as an efficient heterogeneous catalyst for the cycloadditions of CO2 and knoevenagel condensation reactions
Journal of Molecular Structure ( IF 4.0 ) Pub Date : 2024-01-05 , DOI: 10.1016/j.molstruc.2023.137466
Peng Xiong , Ting-Ting Xie , Mi Zhou , Shi-Ming Li , Xiu-Jian Wang , Qing-Ling Ni , Liu-Cheng Gui

The catalytic activity of MOF is determined not only by its unique structure but also by the active sites from metal sites and functional ligands. A sTable 3D strontium complex, {[Sr2(BTCB)Cl(H2O)2]}n (Sr-BTCB), was synthesized under solvothermal condition. It is assembled with an amide-functionalized tricarboxylic acid and a Sr(II)-based infinite chain, where Sr2 repeating units are arranged sequentially. Two such 3D structures are interwoven to create a two-folded interpenetrated structure. The interpenetrated structure is strengthened by π-π interstacking between the central phenyl rings of ligands from different 3D structures. After solvent exchange and vacuum drying, the surface of nanochannels in desolvated Sr-BTCB is modified by unsaturated Sr2+ions. Complex Sr-BTCB has abundant Lewis acidic metal sites and Lewis basic sites of amide groups, as well as 1D rhombic channels. It exhibits excellent stability and heterogeneous catalysis on CO2 fixation reactions into cyclic carbonates and Knoevenagel condensation reactions of aldehydes and malononitrile.



中文翻译:

稳定的 3D Sr-MOF 作为 CO2 环加成和克诺文格尔缩合反应的高效多相催化剂

MOF的催化活性不仅取决于其独特的结构,还取决于金属位点和功能配体的活性位点。在溶剂热条件下合成了sTable 3D锶配合物{[S r 2 (BTCB)Cl ( H 2 O) 2 ]} n ( Sr-BTCB) 。它由酰胺官能化的三羧酸和基于Sr(II)的无限链组装而成,其中Sr 2重复单元依次排列。两个这样的 3D 结构交织在一起,形成两个折叠的互穿结构。不同 3D 结构的配体中心苯环之间的 π-π 堆叠增强了互穿结构。经过溶剂交换和真空干燥后,去溶剂化的Sr-BTCB中的纳米通道表面被不饱和Sr 2+离子修饰。配合物Sr-BTCB具有丰富的路易斯酸性金属位点和酰胺基团的路易斯碱性位点,以及一维菱形通道。它对CO 2固定成环状碳酸酯的反应以及醛和丙二腈的Knoevenagel 缩合反应表现出优异的稳定性和多相催化作用。

更新日期:2024-01-05
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