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The crystal and molecular structures of K3[TbIII(nta)2(H2O)]5.5H2O (nta = nitrilotriacetic acid) and K3[YbIII(nta)2]5H2O complexes have been determined by single-crystal X- ray structural analyses. Because TbIII and YbIII have different ionic radii and electronic configura- tions, they take nine- and eight-coordinate structures with two nta ligands, respectively. The crystal of K3[TbIII(nta)2(H2O)]5.5H2O belongs to orthorhombic, space group Pccn with a = 1.6374(7), b = 1.9913(8), c = 1.5068(6) nm, V = 4.913(3) nm3, Z = 8, Mr = 769.54, Dc = 2.081 g/cm3, m = 3.476 mm-1 and F(000) = 3048. The final R and wR are 0.0432 and 0.0916 for 4961 observed reflections (I > 2.0s(I)), and 0.0814 and 0.1042 for all 21921 reflections, respectively. The [TbIII(nta)2(H2O)]3- complex anion has a nine-coordinate pseudo-monocapped square anti-prismatic structure, in which two N and six O coordinated atoms are from two nta ligands and the left ninth O atom from one water molecule. The crystal of K3[YbIII(nta)2]5H2O is of monoclinic, space group P21/c with a = 1.5579(5), b = 0.9981(3), c = 1.5956(5) nm, b = 109.776(5), V = 2.3348(13) nm3, Z = 4, Mr = 756.62, Dc = 2.153 g/cm3, m = 4.624 mm-1 and F(000) = 1484. The final R and wR are 0.0253 and 0.0657 for 4123 observed reflections (I > 2.0s(I)), and 0.0320 and 0.0731 for all 9414 reflections, respectively. The [YbIII(nta)2]3- complex anion has an eight-coordination structure with a distorted square antiprismatic prism, in which each nta acts as a tetradentate ligand with one N atom from the amino group and three O atoms from the carboxylic groups.
The crystal and molecular structures of K3 [TbIII (nta) 2 (H2O)] 5.5H2O (nta = nitrilotriacetic acid) and K3 [YbIII (nta) 2] 5H2O complexes have been determined by single-crystal X- ray structural analyzes. Because TbIII and YbIII have different ionic radii and electronic configura- tions, they take nine- and eight-coordinate structures with two ligands, respectively. The crystal of K3 [TbIII (nta) 2 (H2O)] 5.5H2O belongs to orthorhombic, space group Pccn with a = 1.6374 (7), b = 1.9913 (8), c = 1.5068 (6) nm, V = 4.913 (3) nm3, Z = 8, Mr = 769.54, Dc = 2.081 g / cm3, 3.476 mm-1 and F (000) = 3048. The final R and wR are 0.0432 and 0.0916 for 4961 observed reflections (I> 2.0s (I)), and 0.0814 and 0.1042 for all 21921 reflections, respectively. The [TbIII nta) 2 (H2O)] 3-complex anion has a nine-coordinate pseudo-monocapped square anti-prismatic structure in which two N and six O coordinated atoms are from two ligands and the left ninth O atom from one water molecule. The crystal of K3 [YbIII (nta ) 2 H2O is of monoclinic, space group P21 / c with a = 1.5579 (5), b = 0.9981 (3), c = 1.5956 (5) nm, b = 109.776 (5), V = , Z = 4, Mr = 756.62, Dc = 2.153 g / cm3, m = 4.624 mm- 1 and F (000) = 1484. The final R and wR are 0.0253 and 0.0657 for 4123 observed reflections (I> 2.0s ) and 0.0320 and 0.0731 for all 9414 reflections, respectively. The [YbIII (nta) 2] 3-complex anion has an eight-coordination structure with a distorted square antiprismatic prism, in which each acts as a tetradentate ligand with one N atom from the amino group and three O atoms from the carboxylic groups.