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- W2379810870 abstract "Eight terbium complexes have been synthesized by using p-bromine-benzoic acid,p-iodin-benzoic acid as the first ligand and 2,4,6-tris-(2-pyridyl)-s-triazine(TPTZ) as the second ligand.The ligands and coordination compounds are studied by IR spectra,UV spectra,fluorescence excitation and emission spectra.The results showed that all the complexes are non-electrolytes.P-bromine-benzoic acid or p-iodin-benzoic acid is bounded with Tb(Ⅲ) through oxygen atoms and 2,4,6-tris-(2-pyridyl)-s-triazine is bounded to Tb(Ⅲ) through three nitrogen atoms.Fluorescence emission spectra indicated that the intensity of terbium complexes of p-bromine-benzoic acid is stronger than those of p-iodine-benzoic acid.The fluorescence intensity of terbium complexes are enhanced by introducing La3+ and Gd3+ ions,respectively.We also find that when n(Tb)∶n(Ln)=1∶1(Ln=La,Gd,Y),the fluorescence emission intensity of Tb0.5La0.5(P-BrBA)3(TPTZ)·2H2O,Tb0.5Gd0.5(P-BrBA)3(TPTZ)·2H2O and Tb0.5Y0.5(P-BrBA)3(TPTZ)·2H2O gradually decrease.The fluorescence emission intensity sequence of Tb(Ⅲ) with p-iodin-benzoic acid and TPTZ complexes are similar with the Tb(Ⅲ) with p-bromine-benzoic acid and TPTZ complexes.The 5D4 energy of Tb3+ ion is 20 430 cm-1,and 21 277 cm-1 for the triplet energy of TPTZ.The triplet energy of TPTZ is higher than the excitation energy of Tb3+ion,thus the absorbing energy of TPTZ can effectively transferred to Tb3+ ion,and producing a characteristic emission spectrum.Some complexes of non-fluorescence rare earth can also absorb the triplet energies of the ligands,and then transfer them to Tb3+,in this way the fluorescence intensity is enhanced." @default.
- W2379810870 created "2016-06-24" @default.
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- W2379810870 date "2011-01-01" @default.
- W2379810870 modified "2023-09-26" @default.
- W2379810870 title "Synthesis,Characterization and Fluorescence Properties of Complexes of Terbium with Halobenzoic Acid and 2,4,6-tris-(2-pyridyl)-s-triazine" @default.
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