Multifunctional Dysprosium(III)–Organic Framework for Efficiently Catalyzing the Cycloaddition of CO₂ and Knoevenagel Condensation under Mild Conditions

High‐Entropy Lanthanide–Organic Framework as an Efficient Heterogeneous Catalyst for Cycloaddition of CO2 with Epoxides and Knoevenagel Condensation

“…The peak at 162.3 eV was attributed to Ho 4d , in accordance with related studies. [44,[75][76][77] As shown in Figure S20, the patterns of PXRD were basically consistent with the fitting ones, confirming that the strength of the host framework is sufficient to withstand the corrosiveness of organic solvents.…”

“…The structural features and chemical compositions of the compounds suggest a Knoevenagel condensation mechanism involving aldehydes and malononitrile. [44,54] Initially, the Lewis acidic sites in HE-LnMOF interact the oxygen atom of the aldehyde group, reducing and activating it. Subsequently, nearby Lewis basic sites, including the hydroxyl group of the organic linker, activate the methylene group in malononitrile, leading to the formation of an imine intermediate.…”

“…As a branch of a family of MOFs, lanthanide metal-organic frameworks (Ln-MOFs) have attracted more and more attention for heterogeneous catalysis due to the strong positive electricity and the abundant vacant electron orbitals of Ln 3 + ions. [42][43][44] They can catalyze the hydrosilylation, acetalization, allylation, cyanosilylation, isomerization, hydrogenation, Diels-Alder, Friedel-Crafts acylation, olefin epoxidation reactions, et, al. [45][46][47][48][49][50][51] However, there are only few Ln-MOFs for the catalytic performance on CO 2 chemical fixation and Knoevenagel condensation were reported.…”

Robust Nitro-Functionalized {Zn3}-Organic Framework for Excellent Catalytic Performance on Cycloaddition Reaction of CO2 with Epoxides and Knoevenagel Condensation

“…According to the latest relevant research, this should be attributed to the steric hindrance (the size of epoxies in Table S5), which greatly hinders the rapid mass transfer of molecules in the channels of NUC-80a . Moreover, another reason is that the large substituent group causes the boiling point of aldehydes to increase, which can reduce the molecular vibration amplitude, and thus affects the effective collision with the active sites . Finally, it is worth mentioning that NUC-80a shows better catalytic performance on the condensation of aldehydes and malonitrile (Table S6), which should be ascribed to that the powerful electron-withdrawing nitro groups can better activate malonitrile molecules via the formation of hydrogen bonds. , …”

Engineering the Activity and Stability of the Zn-MOF Catalyst via the Interaction of Doped Zr with Zn

“…Metal–organic framework (MOF) materials harness metal ions as the catalytic active sites, and their structural configuration could be meticulously regulated through synthesis parameters . This precise control facilitates the tailored design and synthesis of catalysts endowed with specific activity and selectivity, thereby receiving increasing attention in catalytic research. − Notably, the highly ordered pore architecture characteristic of MOFs results in a significantly expanded specific surface area, thus affording an abundance of active sites for catalytic reactions. And the active sites are frequently characterized by structural uniformity and high atomic-level dispersion.…”