| Nitrogen-containing carboxylic acid ligands have strong coordination ability and diverse coordination modes.Metal-Organic Frameworks?MOFs?have attractive topological structures,large specific surface area and permanent porosity which exhibiting great application prospects in the fields of gas adsorption,catalysis and magnetism.In this paper,three kinds of nitrogen-containing carboxylic acid ligands,3,3',5,5'-azobenzene-tetracarboxylic acid?H4L1?,4-[1,2,4]-triazole-benzoic acid?HL2? and 3,5-bis[1,2,4] triazole-benzoic acid?HL3? were coordinated with metal ions such as Mn2+,La3+,Eu3+and Tb3+by solvothermal method and volatilization method to synthesize MOFs materials:{[Mn?H2L1??DMF?2]n}?1?,{[Mn?H2L1??DMF?H2O)]n}?2?,{[Cd?H2L1??DMF?2]n}?3?,{[La?L2?3?H2O?2·3H2O]n}?4?,{[Eu?L2?3?H2O?2·3H2O]n}?5?,{[Tb?L2?3?H2O?2·2H2O]n}?6?,{[Mn?L3?2H2O·H2O]n}?7?.Their crystal structure and thermal stability were determined by X-ray single crystal diffraction,X-ray powder diffraction,infrared,thermogravimetry and other characterization methods.Fluorescence tests were carried out on MOFs 5 and 6.They showed red and green emission with Eu3+and Tb3+ions,respectively.And a series of color emission light was tuned by the ratio of 2:1,1:1,1:2 and 1:4.In addition,MOFs 5 showed a high sensitivity to the detection of Fe3+.Derivatives 1a and 7a calcined from MOFs 1 and 7 were used as anode materials for lithium ion battery?LIBs?.The test results showed that the specific capacity of the first discharge of the two electrode materials is 1125 mAh/g and1214 mAh/g respectively.When the two electrode materials were recycled back to50 mA/g,their average specific capacities were 738.81 mAh/g and 868.10 mAh/g,respectively,showing good reproducibility.At the same time,the rate performance curve also indicates that the two electrode materials have good cyclic stability. |
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