Pan Tong-Hen, Huang Kun-Shan, Huang Chong-En, Lai Fu-Long, Huang Chang-Cang
State Key Laboratory Breeding Base of Photocatalysis, College of Chemistry and Chemical Engineering, Fuzhou University, Fujian, People's Republic of China.
Acta Crystallogr C. 2011 Feb;67(Pt 2):m46-9. doi: 10.1107/S0108270111001065. Epub 2011 Jan 14.
The asymmetric unit of the title coordination polymer, Gd(2)(C(7)H(4)O(5)S)(2)(C(2)O(4))(H(2)O)(6) or Gd(2-SB)(ox)(0.5)(H(2)O)(3) (2-SB is 2-sulfonatobenzoate and ox is oxalate), (I), consists of one Gd(III) ion, one 2-SB anion, three coordinated water molecules and one half of an ox ligand. The ox ligand is located on a crystallographic inversion centre. The Gd(III) centre shows a distorted tricapped trigonal-prismatic coordination formed by nine O atoms from two 2-SB anions, one ox ligand and three coordinated water molecules. The carboxylate and sulfonate groups of the 2-SB anions adopt μ(2)-η(1):η(2) and μ(1)-η(0):η(0):η(1) coordination modes to link two Gd(III) ions, generating a centrosymmetric binuclear Gd(2)(2-SB)(2)(H(2)O)(6) subunit. The ox ligand acts as a bridge, linking the binuclear Gd(2)(2-SB)(2)(H(2)O)(6) subunits into a one-dimensional chain structure parallel to the b axis. Furthermore, extensive O-H···O hydrogen bonds connect the chains into a three-dimensional supramolecular architecture.
