Synthesis and adsorption properties of Zn(Ⅱ)metal-organic framework based on 3,3',5,5'-tetraimidazolyl biphenyl ligands
Solvothermal reactions of a tetradentate imidazole-containing ligand,3,3',5,5'-tetraimidazolyl biphenyl(L),combined with Zn(Ⅱ)salt in the presence of varied auxiliary dicarboxylic acids yield two new metal-organic frameworks(MOFs)with(4,4)topologies,namely[Zn2(L)(BPDC)2]·H2O(1)and[Zn2(L)(OBA)2]6H2O(2),where H2BPDC=4,4'-biphenyldicarboxylic acid,H2OBA=4,4'-oxydibenzoic acid.Single crystal X-ray diffraction analysis has shown that complex 1 consists of 1D chains interconnected by Zn—N bonds,forming a layer structure,which can be further linked by BPDC2-ligands,resulting in the formation of a 3D framework,while complex 2 consists of 2D layers with different 46-membered macrocycles,which are further connected by carboxylates to bring about 3D frameworks.Furthermore,activated complex 2(2')possesses remarkable selective adsorption characteristics for H2O and EtOH.The photoluminescence properties of these MOFs were also thoroughly examined.CCDC:1839915,1;1839916.2.
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