Design,Synthesis And Properties Research Of 4F Triangular Polycarboxylate Framework Molecular Materials

Rare Earth Metal-Organic Frameworks Molecular Materials have become the focus of the research of scientists in recent years due to its novel and varied structure and unique excellent properties.Rare earth metal itself has a unique fluorescence,and at the same time it has subtle interaction with the organic ligands.making the design and synthesis of the target rare earth organic framework molecular materials show potential development prospects that cannot be ignored in many fields such as fluorescence detection.In this paper,we designed and synthesized two series of rare earth organic framework molecular materials by using lanthanide series rare earth metals and two kinds of triangular polycarboxylic acid organic ligands(H3TIBTC and H3BTC).According to its structure and properties,IR,UV,TG,PXRD,dye adsorption,photocatalysis and fluorescence were used to characterize the rare earth organic frameworks molecular materials 1-16.In addition,with the rapid development of nuclear energy in the energy field in the recent years,one of the major constraints that have been found to restrict the development of nuclear energy is the long-term safety disposal of uranium wastes.Based on the design and synthesis of the two new types of rare earth organic framework molecular materials with unique and excellent fluorescence properties,we have selected representative coordination complexes as examples to explore their fluorescence sensing of uranium and various heavy metal cations.The study found that the complexes have a certain quenching effect on uranium solution and some heavy metal positive ions,this prompted us to decide further to summarize the fluorescence characteristics of these two types of coordination complexes.It is concluded that the coordination complexes are favorable materials for the simultaneous selective detection and removal of specific uranium solution from water,being potentially useful in monitoring water quality and treating uranium waste in seawater.In addition,we also explored the properties of the complexes in the photocatalytic degradation of formaldehyde,the adsorption of different dyes and the reduction of acidic potassium permanganate,expanded the potential applications of the molecular materials.Lanthanide rare earth ions usually have a large coordination number when they participate in coordination.Herein,the lanthanide metal ions in the coordination complexes 1-16 are all nine-coordinated structures,forming rare earth organic framework molecular materials having a three-dimensional spatial configuration with slightly twisted three-hat triangular prisms.The formula of rare earth organic framework molecular molecular materials msterials 1-16 are as follows:(?)Note:H3TIBTC=2,4,6-triiodo-1,3,5-benzenetricarboxylic acid;H3BTC= 1,3,5-benzenetricarboxylic acid;DMF=N,N-dimethylformamide;HAc=Acetic acid;HCOOH=Formic acid...