Rational Grafting of Specific Functional Groups to Heterostructured MOF Catalysts for Enhanced Hydrogenation
1The Key Laboratory of Functional Molecular Solids Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 214001, China.
Abstract:
Grafting specific functional groups onto a host catalyst to modulate its electron density is an effective strategy for enhancing heterogeneous catalytic properties. However, introducing functional groups while preserving the host's structural integrity remains a significant challenge. Herein, a multistep strategy was employed to construct a binary MOF-on-MOF catalyst (denoted as ZIF-67-on-MIL-101s), in which specific functional groups were incorporated into the multiporous structure alongside the host MOF. The experimental and theoretical calculation results show that the specific functional group of the host MOF significantly enhances the catalytic activity, leading to ZIF-67-on-MIL-101-NH2 possessing high activity on the hydrogen transfer selectively reduce nitro-compounds under mild conditions. This approach has recently emerged as a research hotspot in the fields of chemistry and materials science.
Related Concept Videos
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
02:13Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
02:36Regioselectivity and Stereochemistry of Hydroboration
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
01:25Radical Anti-Markovnikov Addition to Alkenes: Overview
02:17Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...