Design,Synthesis,Luminescent Properties Of Rare Earth Polybasic Complexes Based On Various Benzene Carboxylic Acids And Acetylacetone

A series binary and ternary complexes of Nd3+,Sm3+,Eu3+,Tb3+,Dy3+ were synthesized and characterized by the various ligands 4-hydroxyphenylacetic acid,isophthalic acid and acetylacetone.The fluorescence intensity of the rare earth binary and ternary complexes and the lifetime of rare earth ternary complexes were measured.The central rare earth fluorescence properties were studied by the effect of the double carboxylic acid and acetylacetone ligands,the single carboxylic acid ligand and the single acetylacetone ligandThe main work was divided into three parts:1.The triplet state energies(Ti)of 4-hydroxyphenylacetic acid,isophthalic acid and acetylacetone were obtained by the Gaussian theory calculations.Meanwhile,the fluorescence properties of the binary and ternary rare earth complexes were assessed and analyzed preliminarily from the triplet state energies.2.[Ln2NO3(H2O)2HPPA(acac)4]n(Ln= Nd,Sm,Eu,Tb,Dy)were synthesized by 4-hydroxyphenylacetic acid(H2PPA)and acetylacetone(acac)in solution method,and structurally characterized by elemental analysis,IR spectra,TG,PXRD and single crystal X-ray diffraction method.In addition,The fluorescence intensity and lifetime of the Sm,Eu,Tb,Dy ternary complexes were measured in the visible region,and the fluorescence intensity the Nd ternary complex was measured in the near-infrared region.In order to study the effect of the H2PPA and Hacac double ligands for the fluorescence intensity of the central rare earth,the single H2PPA ligand rare earth complexes and the single Hacac ligand rare earth complexes were also synthesized,and the fluorescence intensities were also measured in the visible and near-infrared region.The fluorescence properties of central rare earth were studied by the effect of the double H2PPA and Hacac ligands,the single carboxylic acid ligand and the single acetylacetone ligand.The synergic effect of the double ligands(H2PPA and Hacac)was illustrated from the energy matching of the minimum triplet state of the ligands and the resonance energy level of the rare earth ions.3.[Ln2(PIA)2(acac)2]n(Ln= Nd,Sm,Eu,Tb,Dy)were synthesized by isophthalic acid(H2PIA)and acetylacetone(Hacac)in solution method,and structurally approximately characterized by elemental analysis,IR spectra,TG.In addition,The fluorescence intensity and lifetime of the Sm,Eu,Tb,Dy ternary complexes were measured in the visible region,and the fluorescence intensity Nd ternary complex was measured in the near-infrared region.In order to study the effect of the H2PIA and Hacac double ligands for the fluorescence intensity of the central rare earth,the single H2PIA ligand rare earth complexes and the single Hacac ligand rare earth complexes were also synthesized,and the fluorescence intensities were also measured in the visible and near-infrared region.The fluorescence properties of central rare earth were studied by the effect of the double H2PIA and Hacac ligands,the single H2PIA ligand and the single acetylacetone ligand.The synergic effect of the double ligands(H2PIA and acac)was illustrated from the energy matching of the minimum triplet state of the ligands and the resonance energy level of the rare earth ions.