Syntheses,Structures And Properties Of New Coordination Polymers With N-based Carboxylic Acids And Imidazole Ligands

Seven new coordination polymers have been successfully synthesized by solvo-thermal method through ligands containing a nitrogen-containing carboxylic acid derivative(DOTA=1,4,7,10-Dodecane tetraaza-Tetraaccetic Acid),trans-H2CHDA,(CHDA=1,4-Cyclohexane(Dicarboxylic)Acid),2,2'-diphenyl phthalic acid(H2dpa dpa=diphenic acid),pyridine derivative(bpp=l,3-bi(4-pyridyl)propane),rigid dimidazole ligand L(L=4,4'-bis(1-imidazolyl)biphenyl)ligand,and(H2odb,odb=4,4'-oxydibenzoic acid),(TIPA=tris(4-(1H-imidazol)-1-yl)-phenyl)amine).The structure and properties of the complexes were analyzed by means of infrared spectroscopy(IR),elemental analysis(EA),X-ray single crystal diffraction,X-ray powder diffraction(XRD)and thermogravimetric analysis(TGA).Electrochemical analysis Equipments were performed on complexes 1,2,and 7.Anions adsorption Equipments were carried out on complexes 4 and 5.1.Two kinds of coordination polymers were synthesized through DOTA ligand and transition metal nitrate,namely the complex[Ni2(DOTA).H2O]1[Cu3(DOTA)1.5·2H2O]n 2,The coordination polymer 1 has a zero-dimensional structure,and the coordination polymer 2 has a two-dimensional planar structure with a(10-2)CuN2C layer.It is noteworthy that 2 has good electrochemical properties.The zero-dimensional structure of the coordination polymer[Mn(TIPA)(odb)2·2H2O]3 was synthesized by the dissolution of the triangular ligands TIPA and H2odb.2.Two new coordination polymers:[Co(trans-H2CHDA)2(p-BIMB)2·2H2O)]n 4 and[Cd(dpa)(bpp)3]n 5 were successfully obtained with ligands trans-H2CHDA,H2dpa,N-based ligand(p-BIMB=1,4-bis((1H-imidazol-l-yl)methyl)benzene)and pyridine derivative(bpp).Structural analysis indicates that 4 has a two-dimensional layered structure and 5 has a three-dimensional network structure.Complex 4 exhibited better adsorption of MnO42-ions.Coordination polymer 5 exhibited poor adsorption to Cr2O72-ions.3.Through traps-H2CHDA,(L=4,4'-bis(1-imidazolyl)biphenyl)ligand,the complex polymer[Pb(CHDA)2·(H2O)2]n 6 and[Co(L)(NO2)2]n 7 were obtained.where in the complexes 6 and 7 are each a three-dimensional framework material.The electrochemical performance of the complex 7 was tested,and the specific capacitance was only 81 F g-1 at a current density of 1 A g-1.Subsequent doping modification of 7 and found that its electrochemical performance has been greatly improved.