Synthesis And Properties Of Mofs From 2,2'-Bipyridine Carboxylic Acid

The MOFs,which are constructed from 2,2'-bipyridine carboxyl ic acid,have become a hot spot for scientists in recent years becau se of their flexibility and better pore size and shape.Optics,electri city,catalysis,adsorption and other aspects have a very large applic ation potential..In this paper,three novel metal-organic framework complex ma terials[Nd(bpdc)(Hsuc)]n?[Nd(Hbpdc)(bpdc)(H2O)6·(H2O)]n and[Er(b pdc)2(H2O)4·(H2O)2]n,and the optimal synthesis conditions,structural properties and properties of these three complexes were explored.c onclusion as below:1.Through the search of literature,to explore the synthesis of meta 1-organic framework materials,structural properties and its functional ity,select the appropriate organic ligands and metal ions for the th eoretical molecular design;2.The effects of the ratio of solvent,the amount of solvent deioni zed water,the temperature of reaction system and the rate of cooli ng on the synthesis of three new complex materials were explored by using the commonly used hydrothermal synthesis method to cont rol the variables in the reaction.To obtain the optimum synthesis c onditions.3.Structural properties of novel complex materials:(1)The coordination of the synthesized materials by Fourier transf orm infrared spectroscopy showed that the organic ligands coo rdinated with the metal ions.(2)The crystal structure of the complex was measured by X-ray s ingle crystal diffraction:the complex[Nd(bpdc)(Hsuc)]n belongs to the orthorhombic,Pbca space group;[Nd(Hbpdc)(bpdc)(H20)6(H20)]n and[Er(bpdc)2(H2O)4·(H2O)2]n belong to monoclinic,P 2/c space group.(3)The appearance of the three complexes was studied by scannin g electron microscopy(SEM).(4)The complexes[Nd(bpdc)(Hsuc)]n,[Nd(Hbpdc)(bpdc)(H2O)6·(H2O)2]n and[Er(bpdc)2(H2O)4·(H2O)2]n are analyzed by XRD.The results show that the complexes are relatively pure.4.Properties analysis of new complex materials:(1)The thermal stability of the three novel complexes was analyz ed by TG.The results show that[Nd(bpdc)(Hsuc)]n can be sta ble at temperatures below 355?;[Nd(Hbpdc)(bpdc)(H2O)6·(H 2O)2]n can be stable at temperatures below 83?;[Er(bpdc)2(H2O)4(H2O)2]n can be stable at temperatures below 140?.(2)The conductivity of the complex was analyzed by UV-Vis-NI R.The results showed that the complex[Nd(bpdc)(Hsuc)]n?[N d(Hbpdc)(bpdc)(H2O)6·(H2O)]n and[Er(bpdc)2(H20)4(H20)2]n a re semiconductor and can be used as semiconductor materials.(3)The novel complexes[Nd(bpdc)(Hsuc)]n and[Er(bpdc)2(H2O)4·(H2O)2]n all have ORR activity by linear voltammetry(LS V).It can be further modified processing,to explore the pote ntialin the application of electrocatalysis.(4)The[Nd(bpdc)(Hsuc)]n?[Nd(Hbpdc)(bpdc)(H2O)6·(H2O)2]n and[Er(bpdc)2(H2O)4·(H2O)2]n show strong emission peaks at 383 nm?417nm and 415nm,respectively,by using fluorescenceemi ssion spectroscopy.The results show that the wavelengthand a nd the intensity of the fluorescence signal can be optimized and controlled by designing and selecting thenumber of teeth and orbitalenergy of different ligands.5.The CCDC number was applied for the complexes,and the CC DC numbers of the three metal-organic framework complexes[Nd(bp dc)(Hsuc)]n?[Nd(Hbpdc)(bpdc)(H2O)6·(H20)]n and[Er(bpdc)2(H2O)4·(H 2O)2]n were 1472274,1522044 and 1515609,respectively.In this paper,three novel metal-organic framework complexes were designed and synthesized,and the optimum synthesis process of the three complexes was discussed.At the same time,the struct ure and properties and properties of the three complexes were teste d and analyzed for the crystallographic database CCDC provides ne w data support.But also for rare earth chemistry,crystal chemistrya nd other related fields of research and development provides referen ce and help.