Synthesis,Structures And Catalytic Properties Of Coordination Polymers Based On Aromatic Carboxylic Acids

The porous coordination polymers(PCPs)are porous crystalline materials composed of metal ions or clusters and multidentate organic ligands.CPs has been widely used in many fields due to their tunable metal centers,functional organic ligands,and active materials in the framework.However,the application of CPs as catalysts for degradation of contaminants under visible or ultraviolet-visible conditions is far less than that is employed in other fields.In this paper,ten CPs were synthesized by mixing 2,5-dichloroterephthalic acid(H2DCTP)as the main ligand with eight N-donor ligands and three kinds of metal acetate.The complexes were characterized by IR,XRD,fluorescence,thermogravimetric and electrochemical analysis.Moreover,the performances of CPs for the photodegradation of the contaminants were explored.The results are summarized as follows:Four porous CPs were successfully synthesized by respectively mixing H2 DCTP with ligands L1,L2,L3,L4 and Co(OAc)·4H2O under hydrothermal conditions.CP 1 presents a 3D two-fold interpenetrated sqc6 structure;CPs 2 and 4 all show 3D three-fold interpenetrated sqc6 network;CP 3 characterizes a rare 3D three-fold interpenetrated sra framework.The efficiencies of CPs 1~4 for degradation of MB were all above 90% after 110 min under the visible light.Three CPs were synthesized by respectively mixing H2 DCTP with auxiliary ligands L5,L6,L1 and Mn(OAc)2·4H2O.CP 5 exhibits a 1D wave-like chain,while CP 6 is a 2D(4,4)sql layer,and CP 7 forms a 3D two-fold interpenetrated sqc6 network.Under the irradiation of the metal halide lamp for 150 min,the efficiencies of the CPs 5~7 for photocatalytic degradation of MO and MB were respectively above 79% and 73%.Three Ni(Ⅱ)-based CPs were respectively synthesized by mixing H2 DCTP with L7,L8,L2 and Ni(OAc)2·4H2O.CPs 8 and 9 all characterize(4,4)sql structures,CP 10 reveals a 3D three-fold interpenetrated sqc6 framework.The efficiencies of CPs 8~10 for degradation of MB were more than 70% after 120 min under the xenon lamp.