Fluorescent property of the Gd3+-doped terbium complexes and crystal structure of [Tb(TPTZ)(H2O)6]Cl3.3H2O.
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.
Zhao
Yan-Fang
YF
College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China.
Zhao
Yong-Liang
YL
Bai
Feng
F
Wei
Xiao-yan
XY
Zhou
Yong-sheng
YS
Shan
Mei-na
MN
Li
Huan-huan
HH
Ma
Rui-jun
RJ
Fu
Xiao-tao
XT
Du
Yan
Y
D005682:Gadolinium / Q000737:chemistry*; D008024:Ligands; D049449:Luminescence; D008674:Metals, Rare Earth / Q000737:chemistry*; D010714:Phosphatidylethanolamines; D013725:Terbium / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction; D014965:X-Rays
C410262:1,2-dioleoyl-glycero-3-phosphatidyl ethanolamine; D008024:Ligands; D008674:Metals, Rare Earth; D010714:Phosphatidylethanolamines; D014867:Water; D013725:Terbium; D005682:Gadolinium