Single atom Pd1/ZIF-8 catalyst via partial ligand exchange

A partial ligand exchange strategy for fabricating catalytically active single palladium site immobilized on zeolitic imidazolate framework-8(ZIF-8,Pd1/ZIF-8)is proposed in this work.The one-step synthesis simply involves reacting Na_(2)PdCl_(4) with ZIF-8 in solvent.The Cl ligands of Na_(2)PdCl_(4) exchanged with 2-methylimidazole(2-MeIm)of the framework,resulting in the anchoring Pd on the framework and dissociation of Zn into the solution.The whole synthesis is performed at ambient conditions and the crystalline integrity of ZIF-8 is well retained.The resulting Pd_(1)/ZIF-8 is extensively characterized by different techniques which confirm the proposed mechanism.Pd_(1)/ZIF-8 is also successfully applied in the size-selective semi-hydrogenation of alkynes.