首页|Palladium nanocrystals-embedded covalent organic framework as an efficient catalyst for Heck cross-coupling reaction
Palladium nanocrystals-embedded covalent organic framework as an efficient catalyst for Heck cross-coupling reaction
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NSTL
Nanoparticles,such as noble metal nanoparticles and covalent organic frameworks(COFs),advance heterogeneous catalysis.Three COFs were synthesized via the solvothermal method using tricarboxylic acids(tricarboxylic benzene(2,4,6-tri-p-carboxyphenyipyridine(H3L2),4,4',4"-tri carboxyl triphenylamine(H3LI),and trimesic acid(H3BTC))and l,3,5-triazine-2,4,6-triamine moieties.The synthesized COFs were potentially used as supports for the in-situ growth of palladium nanocrystals(Pd NCs),offering a particle size of 1-5 nm.X-ray diffraction(XRD),Fourier transforms infrared(FT-IR),transmission electron microscopy(TEM),high-resolution TEM(HR-TEM),nitrogen adsorption-desorption isotherms,thermogravimetric analysis(TGA),and X-ray photoelectron spectroscopy(XPS)characterized the materials.Using Heck cross-coupling reaction,Pd NCs@COFs were used as catalysts to synthesize different organic molecules via carbon-carbon(C-C)formation.They exhibit complete conversion(100%)for vinyl derivatives and aryl halides(Bromo-and Chloro-derivatives)with good stability.Pd NCs@COFs maintain high catalytic activity over four consecutive cycles.
NSTL
