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

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.

Post-synthetic ion-exchange process in nanoporous metal–organic frameworks; an effective way for modulating their structures and properties

In this review paper, we considered all of the reports on the ion-exchange process which occur in the pores of MOFs. A comparison between MOFs before and after-exchange process and their applications were addressed.

Facile synthesis of a Fe3O4/MIL-101(Fe) composite with enhanced catalytic performance

The as-prepared Fe₃O₄/MIL-101(Fe) shows enhanced catalytic performance for the dimerization reaction of o-phenylenediamine via synergistic peroxidase-like activity.

Anionic metal–organic framework hybrids: functionalization with lanthanide ions or cationic dyes and fluorescence sensing of small molecules

An anionic metal–organic framework, [HDMA]₂[Zn₂(BDC)₃(DMA)]·6DMF is modified by lanthanides and they exhibit selective adsorption ability to cationic dyes. RhB@1 has a rapidest response and realizes sensing acetone and aniline.

Toward understanding the structure–catalyst activity relationship of new indium MOFs as catalysts for solvent-free ketone cyanosilylation

The evidence of highly reactive behavior of four new recyclable and environmental benign indium metal–organic frameworks, MOFs, as Lewis acid catalysts in the solvent-free cyanosilylation of carbonyl compounds.