Novel Metal Organic Frameworks Assembly Based On[Co(?),Ni(?),Zn(?)] And Their Catalytic Properties

Metal-organic frameworks(MOFs)as a new class of porous materials have been paid wide attention because of their large specific surface area,structure diversities and adjustable pore size,which have potential applications in various areas such as gas adsorption and separation,magnetism,drug delivery and catalysis.In this paper,three organic ligands(4-bpdh,3-bpdh and bpd)containing N have been synthesized by nucleophilic addition and nucleophilic substitution reaction.Six metal-organic frameworks,[{M(H2O)5}2((?-4-bpdh)(oba)]?(M = Co,Ni)(1Co and 2Ni)and {M2(oba)4(3-bpdh)2}?·4H20(M = Co,Zn)(3Co and 4Zn),C21HZON3O7Co(5Co)and C14H14NO7Co(6Co)were constructed from the three organic ligands and a carboxylic ligands by layering diffusion and solvothermal method,respectively.Both 1Co and 2Ni presented the same linear rod structure,3Co and 4Zn exhibited a three-dimensional porous network structure,while 5Co and 6Co showed a polycrystalline with no specific structure.Furthermore,microcrystals of 1Co,2Ni,3Co and 4Zn with different sizes and morphologies were obtained under various conditions.Additionally,the catalytic properties of the six MOFs were investigated and the results showed that both 1Co and 2Ni can catalyze methyl orange(MO)and malachite green(MG)except dfferent degradation efficiency;3Co exhibited selective catalytic abilities for the degradation of MG,and the morphologies of 3Co microcrystals had a effect on the MG degradation efficiency;4Zn showed a catalytic activity in Knoevenagel condensation reaction,and the 4Zn microcrystals morphologies influenced the conversion of condensation reaction;5Co and 6Co can catalyze MO and MG,respectively.The unique catalytic properties of these six materials provide a direction for the future research of MOFs in the field of catalysis.