Syntheses and crystal structures of K3[GdIII(nta)2H2O)] • 5H2O and (NH4)[GdIII(Cydta)(H2O) • 5H2O

Two new GO complexes with nitrilotriacetic acid (nta) and trans-1, 2-cyclohexanediaminetetraacetic acid (Cydta) ligands were synthesized. Their crystal structures were determined by single-crystal X-ray structure analyses. The crystal data are as follows: K-3 [Gd-II (nta)(2) (.) (H2O)] (.) 6H(2)O, monoclinic system, C2/c space group, a=1.534 81(15) nm, b=1.292 05(12) nm, c=2.610 8(3) nm, beta=96.244 (2)degrees, V = 5.146 7 (9) nm(3), Z = 8, M = 776.87, D = 2.005 g/cm(3) 3.149 mm(-1) and F(000) = 3 080, R = 0.024 5, wR=0.064 3 for 4 455 unique reflections and R = 0.028 9, wR=0.067 2 for all 10 305 reflections. The Gd-II N2O7 part in the [Gd-II (nta) 2 (H2O)](3-) anion is a pseudo-monocapped square, antiprismatic nine-coordination structure. (NH4) [Gd-II (Cydta) (H2O)(2)] (.) 5H(2)O, triclinic system, P1 space group, a = 0.866 2 (3) nm, b = 1.006 7 (3) nm, c 1.444 8 (5) nm, a = 88.282 (5) P 75.190(5)degrees, gamma = 88.317(4)degrees, V = 1.217 2(7) nm(3), Z = 2, M = 643.69, D, = 1.756 g/cm(3), mu = 2.798 mm(-1) and F (000) = 650, R = 0.030 3, wR = 0.080 9 for 4 273 unique reflections and R = 0.033 2, wR = 0.082 5 for all 5 062 reflections. The Gd-II N2O6 part in the [Gd-II (Cydta) (H2O)(2)](-) anion has a pseudo-square antiprismatic eight-coordination structure.