R. Baggio et al., SYNTHESIS AND X-RAY STRUCTURE OF THE MONONUCLEAR 9-COORDINATE GADOLINIUM(III) HYDROGEN OXYDIACETATE [GD(C4H5O5)(3)]CENTER-DOT-C4H6O5-CENTER-DOT-H2O, Inorganic chemistry, 36(5), 1997, pp. 950
A new mononuclear gadolinium(III) complex [Gd(Hoda)(3)]. H(2)Oda . H2O
(Koda = HO2CCH2OCH2CO2-) has been isolated from the reaction of Gd2O3
With oxydiacetic acid in aqueous solution. A single-crystal X-ray stu
dy features the nine-coordinate GdO9 core in a distorted tricapped tri
gonal-prism environment. The top and bottom triangles are defined by t
hree carboxylate and three carbonyl oxygen atoms, respectively, and th
e capping positions, by three ether oxygens of three tridentate Hoda l
igands.