Syntheses, Structures And Luminescence Properties Of New Transition And/or Lanthanide Coordination Complexes Based On Carboxylic Acid Or Pyridine Carboxylate

Recently, the importance of a material is determined by the role it plays in our everyday life, as well as the impact it has on our future technological progress. In the case of many functional materials, our growing ability to confine their properties to a controlled location has allowed us to manufacture powerful and efficient devices for a wide variety of tasks, making functional materials important to our health, economy and environment. However, Metal-organic frameworks (MOFs) are a fascinating material class of both fundamentally important and technologically relevant. They have been extensively studied for their rich structural chemistry and potential applications. Take above these factors on consideration, the dissertation is aimed to synthesize twelve transition and/or lanthanide coordination complexes based on semi-rigid polycarboxylic acid ligands 3,3’,4,4’-benzophenone tetracarboxylate acid,3,3’,4’,4’-diphenyl-sulfonetetracarboxylate acid and 4’-(3-carboxylpyridyl)-2,2’:6’,2"-terpyridine-6,6"-dicarboxylic acid with excellent photophysical properties. These compounds are characterized by X-ray single crystal diffraction, IR spectra, luminescence analyses and thermogravimetric analyses (TGA). The paper includes the following four chapters:(1) Chapter 1:The concepts of metal-organic frameworks, the synthesis of metal-organic frameworks, the influence factors of synthesis of metal organic frameworks are simply introduced. At the same time, comments on the research progress of polycarboxylic acid coordination polymers and carboxylic acid derivatives of terpyridine are also briefly depicted.(2) Chapter 2:Three new Zn(II) coordination polymers based on 3,3’,4,4’-benzophenone tetracarboxylate acid [Zn2(BTDA)(bpy)(H2O)2]n-5n(H2O)(1), [Zn2(BTDA)(bpy)(H2O)]n·0.5n(bpy)(2), [Zn(H2BTDA)(phen)2]n(3) have been synthesized successfully by changing pH value and auxiliary ligand under hydrothermal conditions. Compounds 1-3 show different dimension structure. Meanwhile, Effect of pH value and auxiliary ligand on the structure of metal-organic frameworks has been discussed. It is shown that these metal organic framework structure can be tuned by the effect of pH value and auxiliary ligand. Moreover, the luminescent properties and thermostabilities are also investigated.(3) Chapter 3:Two new Cd(II) coordination polymers based on 3,3’,4,4’-benzophenone tetracarboxylate acid [Cd2(SA)(phen)2(H2O)4]n·5n(H2O) (4) and [Cd2(SA)(phen)2]n·n(H2O) (5) have been synthesized successfully by changing temperature under hydrothermal conditions. Compounds 1 and 2 showed two different 2D layer structures. At the same time, we discussed effect of temperature on the structure of metal-organic frameworks. It is shown that these metal organic framework structure can be tuned by the effect of temperature. Moreover, the luminescent properties and thermostabilities are also investigated.(4) Chapter 4:The new 4’-(3-carboxylpyridyl)-2,2’:6’,2"-terpyridine-6,6"-dicarboxylic acid and its three types seven new lanthanide coordination polymers{[Ln2L2]·H2O}n (Ln=Pr (6). Nd (7), Sm (8), Eu (9),{[Ln5L4(COO)3(H2O)4]·10H2O}n (Ln=Tb (10), Dy (11) and [Yb2L2(H2O)2]-2H2O (12) have been synthesized successfully by under hydrothermal conditions. In a comparison of effect of metal ion on the structure of metal-organic frameworks. It is shown that these metal organic framework structure can be tuned by the effect of metal ion. Moreover, the luminescent properties and thermostabilities are also investigated. Additionally, The luminescence properties and thermal stability of the complexes have been investigated. All compounds show good NIR luminescence properties and long phosphorescence lifetime and broad potential application prospects in functional materials.