Acta Cryst. (2009). E65, m1214-m1215  [ doi:10.1107/S1600536809036393 ]

Poly[diaqua(₂-5-carboxypyridine-3-carboxylato-²N:O³)hemi(₂-oxalato-⁴O¹,O²:O^1',O^2')(₄-pyridine-3,5-dicarboxylato-⁴N:O³:O^3':O⁵)silver(I)terbium(III)]

H.-F. Guo, L. Qin and X.-Y. Hao

Abstract: In the title coordination polymer, [AgTb(C₇H₃NO₄)(C₇H₄NO₄)(C₂O₄)_0.5(H₂O)₂]_n, the Tb^III ion is eight-coordinated by three O atoms from three different pydc (H₂pydc = pyridine-3,5-dicarboxylic acid) ligands, one O atom from one Hpydc ligand, two O atoms from one oxalate ligand and two water molecules in a distorted square-antiprismatic geometry. The Ag^I ion is coordinated in an almost linear fashion by two pyridyl N atoms from one pydc and one Hpydc ligand and has weak interactions with two carboxylate O atoms. The carboxylate groups of pydc and Hpydc ligands link Tb centers, forming a one-dimensional chain. The oxalate adopts a tetradentate bis-chelating coordination mode, connecting the chains into a two-dimensional layer. These layers are further assembled via [Ag(pydc)(Hpydc)] pillars and O-HO and C-HO hydrogen bonds into a three-dimensional coordination framework.

Online 16 September 2009

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