| 摘 要： | The two title coordination compounds, (NH4)3[TbIII(ttha)]·5H2O (ttha = triethylenetetramine-N,N,N′,N″,N‴,N‴-hexaacetic acid) and (NH4)4[Tb 2 III (ttha)]·9H2O (dtpa = diethylenetriamine-N,N,N′,N″,N″-pentaacetic acid), have been prepared and characterized by FT-IR, elemental analyses, TG-DTA and single crystal X-ray diffraction techniques. The (NH4)3[TbIII(ttha)]·5H2O compound is monoclinic, P21/c; a = 10.398(1) Å, b = 12.791(1) Å, c = 23.199(2) Å; β = 90.914(2)°; V = 3084.9(5) Å3; Z = 4; D calc = 1.704 g/cm3; μ(MoK α ) = 2.376 mm™; R = 0.023 and wR 2 = 0.049 for 5429 observed reflections with I ≥ 2σ(I). The [TbIII(ttha)]3− complex anion in the crystal has a nine-coordinate mononuclear molecular structure with pseudo-monocapped square-antiprismatic configuration. The (NH4)4[Tb 2 III (dtpa)2]·9H2O compound is triclinic, P-1; a = 9.739(1) Å, b = 10.010(1) Å, c = 12.968(2) Å; α= 85.890(2)°, β = 77.338(2)°, γ = 77.587(2)°; V = 1204.2(2) Å3; Z = 1; D calc = 1.832 g/cm3; μ(MoK α ) = 3.015 mm™; R = 0.024 and wR 2 = 0.060 for 4750 observed reflections with I ≥ 2σ(I). The [Tb 2 III (dtpa)2]4− complex anion has a binuclear structure in the crystal; the two TbIII centers are equivalent and have a nine-coordinate environment with the same pseudo-tricapped trigonal-prismatic configuration. The thermal analysis revealed that the coordination cores of the (NH4)3[TbIII(ttha)]·5H2O and (NH4)4[Tb 2 III (dtpa)2]·9H2O compounds are stable up to 221°C and 252°C, respectively. Original Russian Text Copyright ? 2008 by J. Wang, X. Zh. Liu, X. F. Wang, G. R. Gao, Zh. Q. Xing, X. D. Zhang, and R. Xu The text was submitted by the authors in English. Zhurnal Strukturnoi Khimii, Vol. 49, No. 1, pp. 81–89, January–February, 2008.
|
