Sythesis, Characterization And Studies On Fluorescence Property Of Rare Earth Complexes With β-Naphthoyltrifluoroacetone And 2, 2-Bipyridine

Two series of seventeen solid complexes of rare earth chloride and six different proportion co-doped complexes(Eu³⁺: La³⁺) with β -naphthoyltrifluoroacetone and 2,2'-bipyridine have been synthesized and characterazied. Moreover, the crystal stucture of the complex(Eu³⁺:La³⁺=0. 3:0. 7) has been determined.Elemental analysis, rare earth coordination titration and TG-DTA studies show that the complexes have the composition of Eu_0.5Ln_0.5(TFNB)₃bpy ? H₂O (Ln³⁺=Y³⁺, La³⁺, Gd³⁺, Sm³⁺, Tb³⁺, Dy³⁺, Ho³⁺, Pr³⁺, Er³⁺, Nd³⁺) ; Sm_0.5RE_0.5(TFNB)₃bpy ? H₂O (RE³⁺=Y³⁺, La³⁺, Gd³⁺), (Eu_xLa_y)(TFNB)₃bpy ? H₂O(x:y=0. 10:0. 90; 0. 30:0. 70;0. 40:0. 60;0. 70:0. 30;0. 90:0. 10). The molar conductivity indicates that all the complexes are nonelectrolyte ; IR spectra and ¹HNMR spectra show that the ligands coordinate with RE³⁺ ions through the oxygen negative ion of enol form in TFNB and two nitrogen atoms of 2,2'-bipyridine. Fluorescence spectra and fluorescence lifetimes show that the fluorescent intensity and lifetime of a series of...