| In recent decades,coordination polymers have attracted widely attention of the applications in different areas.The porous metal-organic frameworks(MOFs)of novel structures constructed by the metal/metal cluster ions and organic ligands,and which has important research significance in fluorescence sensing,catalytic conversion,adsorption and magnetic properties etc.It is worth noting that the highly symmetric carboxylic acid ligands contribute to formation of MOFs with different pore structures.Therefore,the rigid polycarboxylic ligands of C3-symmetric linked 1,3,5-tris(4-carboxyphenyl)benzene(H3L)and the 3-(3-methyl-2-pyridine)-5-(4-pyridine)-1,2,4-triazolium(Hmdpt)with multiple N active sites were chosen as organic ligand.The five stable and porous MOFs were synthesized by solvent method with metal ions.The structures of MOFs were basically characterized,and the corresponding performance of them were explored in detail.The research contents were divided into the following four chapters:Chapter 1 The design and construction of coordination polymers as well as the research status and application prospects were briefly described.The significance of topic selection and related research progress was discussed in depth.Chapter 2 The 3D porous complex{[Ba3L2(NMP)2(H2O)2]·2NMP·H2O}n(1)was successfully constructed with Ba(?)ions and H3L ligands.In view of the porosity and open metal site of 1,the catalytic properties of CO2 and epoxy compounds was studied.Due to the excellent fluorescence properties,it had been used as a fluorescent probe to detect Fe3+,Cr2O72-,Cr O42-and[Fe(CN)6]3-ions.In addition,the Congo red(CR)dye could be adsorbed by 1.Chapter 3 Three isomorphic complexs{[Ln2(L)2(NMP)(H2O)3]·NMP·2H2O}n(2-4)were constructed by Ln(?)ions and H3L.The structure of 2 modified by carboxyl group has favourable chemical stability and luminescence properties.The results shown that 2 could be used as a fluorescent sensor to detected nitrobenzene(NB)and heavy water(D2O).Furthermore,according to the high porosity of 2,the adsorption performance of CO2 was investigated.At the same time,antiferromagnetic interaction was observd between Dy(?)ions in 4.Chapter 4:The complex{[Co4(L)2(mdpt)3(H2O)]·13DMF·7H2O}n(5)was constructed with Co(?)ions,H3L and the auxiliary ligand 3-(3-methyl-2-pyridine)-5-(4-pyridine)-1,2,4-triazolium(Hmdpt).The porosity of 5 was up to 63.7%,and which not only had significant adsorption and separation performance for methylene blue(MB)dye,but also had outstanding adsorption performance for CO2 molecules on account of the multiple adsorption sites of N in the channels.In addition,complex 5 exhibits antiferromagnetism owing to the negative interaction between adjacent Co(?)ions. |
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