Functionalization strategy influences the porosity of amino-containing porous aromatic frameworks and the hydrogenation activity of palladium catalysts synthesized on their basis

Palladium Catalysts Based on Nitrogen-Containing Porous Aromatic Frameworks for Hydrogenation of Unsaturated Compounds

“…This could be caused by the introduction of functional groups into the pre-generated porous structure (Table 1). On the other hand, the elemental analysis data clearly indicate that the nitrogen content in PAF-20-NH 2 -pre/post (5.1 wt %) is lower than in PAF-20-NH 2 -pre, a modified material prepared from tetrakis(3-amino-4-bromophenyl)methane monomer without any post treatment (6.0 wt %) [14]. This observation may serve as evidence that no additional nitro groups were introduced, and therefore the porosity decline was caused by framework degradation.…”

“…Finally, we evaluated the activity and selectivity of the catalysts synthesized in this study in comparison with the Pd catalytic systems described in previous public reports (Table 5). In a series of previous studies performed by our research team, a pair of catalysts derived from pre-modified amino-containing PAFs synthesized from tetrakis(3-amino-4-bromophenyl)methane without further post-treatment (labeled Pd-PAF-20-NH 2 -pre and Pd-PAF-30-NH 2 -pre) were tested in selective hydrogenation [14]. The catalysts prepared in the present work under identical conditions exhibited higher activity while maintaining styrene selectivity at 92-93%.…”

“…There are two strategies for modifying a PAF structure: pre-and post-functionalization [14][15][16]. The first approach is based on the use of modified monomers in the synthesis of supports to establish a specific arrangement of functional groups in the material.…”

Synergetic Patterns of Chiral Fragments and Steric Confinement for the Separation of Chiral Pharmaceuticals

“…Porous aromatic frameworks (PAFs), a novel functional porous scaffold, have exhibited some excellent qualities of high stability, large surface area, and open architecture. , Due to the excellent designability, PAF materials are an excellent platform for preparing a novel chiral separation material. In this work, a chiral amino acid, 3,5-dibromotyrosine, was introduced into a PAF skeleton through an in situ Sonogashira coupling reaction.…”