Acta Cryst. (2009). E65, m1551-m1552  [ doi:10.1107/S1600536809046613 ]

Poly[[tetraaquabis[₄-2,2'-(p-phenylenedioxy)diacetato][₂-2,2'-(p-phenylenedioxy)diacetato]dierbium(III)] hexahydrate]

D.-Y. Wei, Y.-G. Zhang, M.-L. Wang and Z.-K. Zhu

Abstract: The asymmetric unit of the title compound, [Er₂(C₁₀H₈O₆)₃(H₂O)₄]·6H₂O, comprises one Er³⁺ ion, one and a half 2,2'-(p-phenylenedioxy)diacetate (hqda) ligands, two coordinated water molecules and three uncoordinated water molecules. The Er³⁺ ion is nine-coordinated by seven O atoms from hqda ligands and two O atoms from water molecules. In the title compound, there are two types of crystallographically independent ligands: one with an inversion center in the middle of the ligand is chelating on both ends of the ligand towards each one Er center; the other hqda ligands are bridging-chelating on one side, and bridging on the other end of the ligand. Two adjacent Er³⁺ ions are thus chelated and bridged by -COO groups from hqda ligands in three coordination modes (briding-chelating, bridging and chelating). These building blocks are linked by OOC-CH₂O-C₆H₄-OCH₂-COO spacers, forming two-dimensional neutral layers. Adjacent layers are linked by O-HO hydrogen-bonding interactions, forming a three-dimensional supermolecular network.

Online 11 November 2009

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