| Coordination Polymers?CPs?is a crystalline materials with crystalline network structure,which is connected by coordination bonds of inorganic metal nodes and organic ligand.The synthesis is influenced by many factors,such as central metal ion,organic ligand type,solvent,temperature and so on.Therefore,different frameworks and abundant molecular topological structures have been obtained under different conditions,which also makes the CPs materials show broad application prospects and potential applications in drug release,sensing,gas adsorption and separation,heterogeneous catalysis.In addition,in order to further expand the application of CPs materials,different CPs composites have been prepared by using new techniques.For example,electrochemical in-situ deposition technology can be used to explore new and practical CPs thin film,which will be another hot topic in the field of CPs research.In order to explore the influence of synthetic factors and structural characteristics on the functionalpropertiesofcomplexes,therigidtriazolecarboxylicacidligand4-?3-carboxyl-1,2,4-1H-triazol-1-yl?benzoic acid and flexible imidazole carboxylic acid ligand 1-?3,5-Dicarboxy benzyl?-1H-benzoimidazole-5,6-dicarboxylic acid?H4L2?have been chosen to construct CPs in this paper.Fortunately,thirteen novel CPs were synthesized successfully by hydrothermal method:[Zn?L1??H2O?2]n?1?,[Cd?L1??H2O?2]n?2?,[Pb?HL1?2]n?3?,[Pb?L1??H2O?]n?4?,[Cu?L1??H2O?2]n?5?,[Co?L1??H2O?2]n?6?,[Mn?L1??H2O?2]n?7?,{[Ln?L1??HL1??H2O?2]·H2O}n?8-11??Ln=Eu?8?,Tb?9?,Dy?10?,Sm?11??,{[Zn2?L2??H2O?3]·NMP·1.5H2O}n?12?,{[Cd2?L2??H2O?3]·DMF·2H2O}n?13?.The full text is composed of five chapters:In chapter 1,the basic concepts,structure types,influencing factors and application prospects of organometallic skeleton were introduced.Based on the summary of the existing research work on coordination polymers,the significance and research strategies of this paper were described.In chapter 2,The structure,coordination mode and basic properties of seven complexes based on the above H2L1 ligand were introduced.The solid-state fluorescence properties of complexes 1-4 were analyzed and discussed.The emission peaks of complexes 1 and 2showed red shift and 4 showed blue shift,the emission peak of 3 was similar to that of ligand.At the same time,the magnetic properties of complexes 5-7 were tested,it was found that there was antiferromagnetic interaction between the central metal ions of the three complexes.In chapter 3,The structures and basic properties of four complexes 8-11 based on the above H2L1 ligand with lanthanide metal ions were introduced.Meanwhile,the selective fluorescence sensing properties of complex 8 for metal ions and anions in aqueous solution were studied in detail.The results show that the complex 8 exhibits high selectivity and sensitivity to the Fe?III?and Cr?VI?in the aqueous solution.The mechanism of fluorescence sensing was discussed in detail.In addition,the magnetic properties of complex 10 were studied,and the antiferromagnetic interaction between Dy?III?ions in complex 10 was obtained.In chapter 4,The structural characteristics and basic properties of two three-dimensional microporous complexes synthesized based on the imidazole carboxylic acid ligand H4L2 were introduced.In addition,the adsorption capacity of complex 12 for various dyes in aqueous solution was tested,and the selective adsorption of methylene blue organic dye molecules by complex 12 was obtained.In chapter 5,The basic principle and specific process of preparing MOF thin films by electrochemical deposition of MOF?PCN-6?on metal plates were introduced.The obtained PCN-6 thin films were characterized by XRD,SEM and AFM.By the way,this chapter provides ideas and directions for the preparation of MOF thin films. |
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