Design and Assembly of a Hierarchically Micro- and Mesoporous MOF as a Highly Efficient Heterogeneous Catalyst for Knoevenagel Condensation Reaction
作者:Kun Cai、Wenjun Tan、Nian Zhao、Hongming He
DOI:10.1021/acs.cgd.0c00636
日期:2020.7.1
A 3D hierarchically micro- and mesoporous MOF, [Tb6(μ3-OH)8·(2-FBA)2·(H2O)6·(DCBA)2]·10DMF·4H2O (namely, Tb-DCBA), was successfully constructed by the coordination self-assembly process between H4DCBA linker and Tb6 hexanuclear cluster. By virtue of preferable physicochemical stability, high surface area, multiple porosity, and abundant amino functional groups, Tb-DCBA is not merely considered as a greatly potential heterogeneous catalyst for Knoevenagel condensation reaction, but also has remarkable repeatability for reusing at least four times. It is worth noting that micro- and mesoporous MOF is still an urgent and enormous challenge, because such MOFs are difficult to synthesize and determine precise structures, and always possess relatively poor stability to limit their practical applications. Hence, this work creates a scarce opportunity for a hierarchically micro- and mesoporous MOF for investigating its catalytic performance.
一种三维分级微孔和介孔金属有机框架(MOF),[Tb6(μ3-OH)8·(2-FBA)2·(H2O)6·(DCBA)2]·10DMF·4H2O(即Tb-DCBA),通过H4DCBA连接体与Tb6六核簇的配位自组装过程成功构建。得益于优越的物理化学稳定性、高比表面积、多孔性以及丰富的氨基功能团,Tb-DCBA不仅被认为是Knoevenagel缩合反应的极具潜力的非均相催化剂,还具有至少四次的显著重复使用能力。值得注意的是,微孔和介孔MOF仍然是一个迫切而巨大的挑战,因为此类MOF难以合成和准确确定其结构,并且通常具有相对较差的稳定性,限制了其实际应用。因此,这项工作为研究分级微孔和介孔MOF的催化性能创造了一个稀缺的机会。