Acta Cryst. (2007). E63, m415-m417  [ doi:10.1107/S1600536807000049 ]

Poly[[diaqua[₆-(butane-1,4-diyldinitrilotetramethylene)tetraphosphonato]di-₂-oxalato-digadolinium(III)] tetrahydrate]

S.-M. Ying, J.-Q. Liu, S.-L. Cai, F. Zhong and G.-P. Zhou

Abstract: The title compound, [Gd₂(C₈H₂₂N₂O₁₂P₄)(C₂O₄)₂(H₂O)₂]·4H₂O, was synthesized by the hydrothermal method. It exhibits a pillar-layer structure, with the layers formed by Gd^III ions interconnected by the oxalate ions and the -NH(CH₂PO₃H)₂ units of the tetraphosphonate dianions. The central organic groups of the tetraphosphonate ligands act as the pillars. Each oxalate ion bridges two Gd^III ions and each tetraphosphonate ligand bridges six Gd^III ions. Inversion centres are located at the mid-points of the central C-C bonds of both types of ligands.

Online 10 January 2007

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