Synthesis, Characterization And Studies On Fluorescence Property Of Doped Rare Earth-NTA-Phen Complexes

Two series of thirteen complexes of rare earth chloride with 4, 4, 4-trifluoro-1-(2-naphthyl)-1, 3-butanedione and phenanthroline have been synthesized andcharacterized. In addition, Ten solid complexes doped with different proportional rareearth ions have been synthesized.Elemental analysis, rare earth coordination titration and TG-DTA studiesindicate that the composition of the series of Eu³⁺ doped with different rare earth ionshave this type molecular formula: Eu_0.5RE_0.5(NTA)₃Phen (RE³⁺=Y³⁺, La³⁺, Gd³⁺,Sm³⁺, Tb³⁺, Dy³⁺); The composition of the series of Sm³⁺ doped with different rareearth ions have molecular formula as follows: Sm_0.5RE_0.5(NTA)₃Phen (RE³⁺=Y³⁺,La³⁺, Gd³⁺). There are two groups of the series of Eu³⁺ complexes doped withdifferent proportional rare earth ions. The first group is the series ofEu_xY_y(NTA)₃Phen, The doped atom is Y; The second group is Eu_xTb_y(NTA)₃Phen,The doped atom is Tb. The doped proportion is x:y=0.1:0.9; 0.3:0.7; 0.4:0.6; 0.7:0.3;0.9:0.1. The molar conductivity indicates that all the complexes are nonelectrolyte.¹HNMR spectra and IR spectra show that the ligands coordinate (double-tooth) withRE³⁺ ions through the oxygen negative ion of enolic form of 4, 4, 4-trifluoro- 1-(2-naphthyl)-1, 3-butanedione and the two nitrogen atoms of phenanthroline,Fluorescence spectra show that the fluorescence intensity of the series of Eu³⁺complexes are much higher than that of the series of Sm³⁺ complexes. Fluorescencelifetime show that the decay time of Eu³⁺ complexes are longer than that of the seriesof Sm³⁺ complexes; Furthermore, The best fluorescence intensity was studied in thisarticle according to different proportional doped rare earth ions.