Publications (2)2.95 Total impact
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Article: [Synthesis and fluorescence properties of complexes of terbium with red fluorescence].
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ABSTRACT: Two terbium complexes were synthesized, with dibenzoylmethane (HDBM) as the first ligand and 1,10-phenanthroline (phen), dipyrido[3,2-a:2',3'-c] quinoxaline as the second ligand. The studies of elemental analysis, rare earth complexometric titration, molar conduction, IR spectra, UV spectra, fluorescence excitation and emission spectra indicate that the complexes have the compositions of Tb (DBM)3 phen and Tb (DBM)3dpq. The results show that the rare earth ion (Tb3+) was bonded with the carbonyl oxygen atom of DBM and nitrogen atoms of phen and dpq. For the terbium complexes prepared by precipitation, the peak positions of the transitions were similar with the ones of the common complexes. The peaks at 490, 545, 586 and 621 nm were assigned to the D4 --> 7F6, 5D4 --> 7F6, D4 --> 7F6, 5D4 --> 7F6 transitions. For the fluorescence intensities of their 5D4 --> 7F6, 5D4 --> 7F5 and 5D4 --> 7F4 transitions were lower than that of the 5D4 --> 7F3 transition, the terbium complexes did not exhibite the characteristic fluorescence (green), but strong red fluorescence. The reason why terbium complexes exhibit the red fluorescence was investigated in the paper by studying the triplet state of ligands, the energy level transitions of complexes and the aggregation state of particles.Guang pu xue yu guang pu fen xi = Guang pu 01/2011; 31(1):158-61. · 0.84 Impact Factor -
Article: Fluorescent property of the Gd3+-doped terbium complexes and crystal structure of [Tb(TPTZ)(H2O)6]Cl3.3H2O.
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ABSTRACT: The complex of Tb(TPTZ)Cl(3).3H(2)O was synthesized by adding the ethyl alcohol solution of TbCl(3) (1 mmol) to the solution of 2,4,6-tris-(2-pyridyl)-s-triazine(TPTZ, 1 mmol) with constant stirring. The solution which had been filtered was kept at the room temperature for 4 weeks, and then a kind of transparent crystal was formed. Besides, nine kinds of solid complexes in the different molar proportion of terbium to gadolinium had been synthesized by adopting the similar method mentioned above. It was inferred from the elemental analysis and rare earth complexometry that the composition of these complexes is (Tb(x)Gd(y))(TPTZ)Cl(3).3H(2)O (x : y = 0.9 : 0.1, 0.8 : 0.2, 0.7 : 0.3, 0.6 : 0.4, 0.5 : 0.5, 0.4 : 0.6, 0.3 : 0.7, 0.2 : 0.8, 0.1 : 0.9). The absorption spectra and photoluminescence of the complexes were determined in dimethylsulfoxide (DMF), which showed that the excitation of the complexes is mostly ligand based. The triplet state energy level of TPTZ was measured, indicating that the lowest excitation state energy level of Tb(III) and the triplet state energy level of TPTZ match well each other. The fluorescent data indicated that the fluorescent emission intensity of Tb(3+) ions would be enhanced in the complexes after terbium was doped with Gd(3+) ion. When x : y was 0.5 : 0.5, the fluorescent emission intensity was the largest. The result obtained by testing the X-ray diffraction of the monocrystal revealed that the molecular formula of the mono-crystal complex is [Tb(TPTZ)(H(2)O)(6)]Cl(3).3H(2)O. The number of metal ion coordinates is nine, and the tridentate TPTZ and six water molecules are bonded with terbium respectively. Besides, it also revealed that the monocrystal belongs to the monoclinic system, and space group Cc with the following unit cell parameters is a = 1.4785 (3) nm, b = 1.0547 (2) nm, c = 1.7385 (4) nm, beta = 94.42 (3) degrees, V = 2.7028 (9) nm(3) and Z = 4.Journal of Fluorescence 03/2010; 20(3):763-70. · 2.11 Impact Factor
