Hybridization of Palladium Nanoparticles with Aromatic‐Rich SU‐101 Metal‐Organic Framework for Effective Transfer Hydrogenation

Abstract

Metal-organic frameworks (MOFs) are crystalline porous materials with designable pores. In this study, we loaded Pd nanoparticles onto π-electron rich pores of ellagic acid based SU-101 MOF (Bi 2 O(H 2 O) 2 (C 14 H 2 O 8 ) • nH 2 O) in order to surround Pd active sites with π-electron rich environment. The material has been explored for the transformation of 4-Nitro phenol (4-NP) to 4-Amino phenol (4-AP) using ammonia borane (AB). AB acted as efficient transfer hydrogenation agent compared to NaBH 4 because of its ability to transfer hydrogens at milder conditions.AB is safer and easy to handle compared to molecular hydrogen or NaBH 4 . The Pd NPs are loaded on to SU-101 using two methodologies. One by supporting preformed Pd NPs onto MOF surface (Pd-WCGA/SU-101) and the other by wet impregnation method (Pd/SU-101). The later method yields a material with strong interaction between Pd and SU-101. The Pd/SU-101 exhibited superior activity for 4-NP reduction (turn over frequency = 2421 h À 1 ) using AB due to an enrichment of 4-NP around Pd active sites by π-electron rich pore environment.

Dynamic Imine Exchange Enables Access to Nanoporous Covalent Organic Frameworks with High Crystallinity for the Heck Reaction

“…1−3 COFs have attracted much interest because of their fascinating properties including π-conjugated skeletons, high surface areas, and tailormade functions. 4−6 Flexible design and modular synthesis endow them with great potential in catalysis, 7−9 optoelectronics, 10 sensing, 11,12 biomedicine, 13 energy storage, 14,15 separation, 16,17 and environmental remediation. 18 COF synthesis is controlled by dynamic covalent chemistry, which allows for the formation of well-ordered network structures through error correction.…”

Lewis Acid‐Catalyzed Ring‐Opening Alcoholysis of Cyclohexene Oxide: The Role of Open Metal Sites in the Bi(III)‐based Metal‐Organic Framework SU‐101

“…[27] The role of OMS within this MOF material was demonstrated in the transformation of H 2 S into polysulfides. [28] Additionally, SU-101 was applied for transfer hydrogenation, [29] CO 2 adsorption, [30] and pollutants adsorption. [31] Interestingly, nanorods of nonporous SU-101 were recently reported as a promising catalyst for CO 2 electroreduction, [32] showing robust chemical stability, high and selective catalytic activity, and exceptional retention of its catalytic activity for a long-term process.…”

A Multifunctional Co-Based Metal–Organic Framework as a Platform for Proton Conduction and Ni trophenols Reduction

“…In order to prevent agglomeration, developing a stable supporter with suitable aperture size is becoming more and more essential. MOFs have excellent confinement effects and have become excellent supporters for controlling and restricting Pd NP growth and aggregation. , Therefore, designing some stable MOFs with a suitable aperture size to load Pd NPs is very important. Herein, a stable porous Co-MOF ( LCUH-103 ) based on H 2 btzip ligand was constructed by the hydrothermal method in our lab in 2018 (CCDC: 2202298).…”