Acta Cryst. (2006). E62, m2543-m2545  [ doi:10.1107/S1600536806036002 ]

Poly[[tetraaquadi-₄-succinato-₅-succinato-diytterbium(III)] hexahydrate]

N. Rahahlia, K. Alioune, A. Guehria-Laidoudi, S. Dahaoui and C. Lecomte

Abstract: The title compound, {[Yb₂(C₄H₄O₄)₃(H₂O)₄]·6H₂O}_n, is a two-dimensional open-framework built up from centrosymmetric binuclear units developed along [100] through the spacers of four extended ligands, and interconnected along [101] by two twisted ligands, forming a layered coordination polymer in the (010) plane embedding six uncoordinated water molecules. The water-coordinated Yb^III atom completes a nine-coordination mode via seven O atoms from four carboxylate ligands, in a monocapped square antiprism. One independent succinate ligand, located on an inversion center, is in a bidentate coordination mode, exhibiting an anti conformation. The second independent succinate ligand, in a gauche conformation, is bidentate and bridging-chelating, involving one triply ligating O atom displaying the longest Yb-O bond [2.598 (2) Å]. In addition to interlayer hydrogen bonds, intralayer hydrogen bonds involve, as acceptors, carboxylate O atoms which are in bidentate mode.

Online 13 September 2006

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