Syntheses, Structures And Properties Of Rare Earth/Transition Coordination Compounds Based On Imidazophenanthroline Derivative Ligands

Metal compounds are composed of central atoms?ions?and organic ligands,which have different spatial configurations through coordination bonds.They have both the performance advantages of inorganic and organic materials and have gradually become an important research direction of functional materials.The purpose of this paper is to prepare novel metal compounds with unique structures and good properties,for the purpose of using two adjacent phenanthroline derivatives were ligands and rare earth and transition metal ions,under the condition of hydrothermal or solvothermal 23 compounds were synthesized.And characterized by IR spectra,elemental analyses,powder X-ray diffraction and single crystal X-ray diffraction.At the same time,the thermal stability and fluorescence performance of the compounds were studied,the fluorescence sensing of the compounds with good fluorescence performance was explored,and the white light performance of the compounds was also studied.The text is divided into the following three chapters:Chapter 1:The development background of metal compounds and the research progress of imidazole[4,5-f][l,10]-phenanthroline compounds in recent years are summarized.Chapter 2:MPIP was selected as the ligand,and aromatic acids such as benzene-1,3-dicarboxylic acid and p-methoxybenzoic acid were added,18 compounds were successfully coordinated with rare earth ions under different reaction conditions.The structure of compounds was analyzed in detail,introducing a second ligand,intermolecular hydrogen bonding and?···?interaction will be important in the formation of compound structures.And their thermal stability and fluorescence properties were tested,compound 4 can be used as a fluorescent probe to identify Fe³⁺ions and Cr₂O₇^2-ions,and compound 5 can be used as a fluorescent probe to identify Fe³⁺ions.Moreover,it can also be used according to the characteristic emission peak of Tb³⁺ions in acidic conditions,while the peak type disappears in alkaline conditions,so it can be used as an acid and base detection probe.Compounds 1,4,5 obtained white light in CIE coordinates by physical doping.Compounds 12 and 13 also obtain white light emission by means of physical doping.Chapter 3:HL was selected as the ligand,and oxalic acid and adipic acid were selected as the second ligand.Seven compounds were successfully coordinated with different transition metal ions under hydrothermal reaction conditions.The structure of compounds was analyzed in detail,introducing a second ligand and intermolecular hydrogen bonding will be important in the formation of compound structures.Their thermal stability and fluorescence properties also were tested,compound 20 can be used as a fluorescent probe to identify Cu²⁺ions.When compound 22 was excited by the excitation wavelength within the wavelength range of320-350 nm,the CIE coordinates of the samples all fell in the white light region,and the samples could get white light emission.