NEW NINE-COORDINATE (NH4)(3)[Yb-III(TTHA)]center dot 5H(2)O AND EIGHT-COORDINATE (NH4)[Yb-III((PDTA)(H2O)(2)]center dot 5H(2)O COMPLEXES: STRUCTURAL DETERMINATION

The (NH4)(3) [Yb-III(ttha)]center dot 5H(2)O (I) (H(6)ttha = triethylenetetramine-N,N,N',N ",N"',N"'-hexaacetic acid) and (NH4)[Yb-III(pdta)(H2O)(2)]center dot 5H(2)O (II) (H(4)pdta = propylenediamine-N,N,N',N'-tetraacetic acid) complexes are synthesized by heat-refluxing and acidity-adjusting methods, and their structures are determined by single crystal X-ray diffraction techniques. These two complexes are all mononuclear structures. The complex I crystallizes in ttha monoclinic crystal system with the P2(1)/c space group. The central Yb-III ion is nine-coordinated only by one the ligand, and one non-coordinate carboxyl group is left. The crystal data are as follows: a = 10.321(4) angstrom, b = 12.744(5) angstrom, c = 23.203(9) angstrom, beta = 91.082(6)degrees, V = 3051(2) angstrom(3), Z = 4, D-c = 1.754 g/cm(3), mu = 3.150 mm(-1), F(000) = 1636, R = 0.0357, and wR = 0.0672 for 6203 observed reflections with I >= 2 sigma(I). The YbN4O5 part in the [Yb-III(ttha)](3-) complex anion forms a pseudo-monocapped square antiprismatic polyhedron. The complex II is coordinated with one pdta ligand and two water molecules, which form an eight-coordinate structure, and crystallizes in the triclinic crystal system with the P (1) over bar space group. The YbN2O6 part in the [Yb-III(pdta)(H2O)(2)](-) complex anion makes a pseudo-square antiprismatic polyhedron. The crystal data are as follows: a = 9.8923(9) angstrom, b = 10.9627(10) angstrom, c = 12.2618(11) angstrom, alpha = 67.284(5)degrees, beta = 70.956(6)degrees, gamma = 68.741(5)degrees, V = 1115.97(18) angstrom(3), Z = 2, D-c = 1.843 g/cm(3), mu = 4.264 mm(-1), F(000) = 618, R = 0.0177, and wR = 0.0409 for 4036 observed reflections with I >= 2 sigma(I).