Preparation, Characterization And Luminescence Properties Of Lanthanide Complexes

Since 1980 s,organic-inorganic hybrid materials become the focus of attention,China is rich in rare earth resources,coal storage is widely distributed,all kinds of rare earth containing,provides a very good platform for the study of complexes of rare earth materials.Rare earth elements have been widely used in the fields of fluorescent probe,biological imaging,drug delivery,and ion detection because of their unique electronic structure.In this thesis,a series of rare earth complexes have been synthesized and characterized by a series of rare earth complexes.We mainly use room temperature evaporation and diffusion method of two kinds of easy operation and low cost input method,were successfully prepared by Tb3+,Eu3+,Gd3+ three new complexes of rare earth ions as the center,through the accurate structure characterized by single crystal X-ray diffraction,further research on its fluorescence properties.By adjusting the reaction temperature and reaction time,the nanoparticles with uniform size,smooth surface and controllable nanoparticle size were obtained:(1)In this chapter,the 4-bromo-3-methyl benzoic acid(BMBA)and 4--3-iodine methyl benzoic acid(LMBA)ligand,respectively by evaporation and diffusion method with 1,10-phenanthroline ligands were synthesized a new complex structure by room temperature for Tb3+,Eu3+,Gd3+ center ion.The lattice parameters of single crystal structure analysis shows that the 4 is a=9.9425,b=12.5836,c=15.5649,alpha beta gamma = 97.781,=82.0360,=65.4410,V=1788.06,Z=1,the 7 structure of the unit cell parameters a= 9.9470,b= 12.6676,c=16.0718,=96.979,alpha beta gamma,=98.032,=108.571,V= 1870.88,Z=1.The two structures(4 and 7)of rare earth elements in the same structure,4 coordinated halogen ligands only different,it can test 4 and 7 luminescence properties,effects of ligand 4 substituents on the fluorescence properties of the nature.(2)The rare earth complexes of Tb3+,Eu3+ and Gd3+ were synthesized by diffusion method,and their structure and fluorescence properties were studied.In this chapter,with four iodine three methyl benzoic acid as the ligand(LMBA),4,4-bipyridine ligands were synthesized at room temperature,a new structure of by placing Tb3+,Eu3+ and Gd3+ as the central ion coordination polymer,crystal structure analysis method by hierarchical lattice parameters a= 9.7606,b= 13.4593,c= 14.7633 = 105.629,alpha,beta = 92.919,r = 105.531,V= 1783.7,Z=2.The luminescent properties were studied.(3)Using a solvothermal method,using three methyl benzoic acid as ligand to metal terbium ion as the center,by adjusting the reaction time and reaction temperature to achieve nanometer particle size,controllable synthesis of nano particles are uniformly dispersed,and the measured result of fluorescence quantum yield is relatively high.