Acta Cryst. (2009). E65, m410  [ doi:10.1107/S1600536809008824 ]

catena-Poly[[[diaquaterbium(III)]--6-carboxynicotinato--pyridine-2,5-dicarboxylato] dihydrate]

S. Li, F.-L. Zhang, S.-B. Wang and H.-L. Bai

Abstract: The title compound, {[Tb(C₇H₃NO₄)(C₇H₄NO₄)(H₂O)₂]·2H₂O}_n, is isotypic with the analogous Tm^III compound [Li, Zhang, Wang & Bai (2009). Acta Cryst. E65, m411]. The Tb^III atom is octacoordinated by two water molecules and by four carboxylate O atoms and two pyridyl N atoms from two pyridine-2,5-dicarboxylate (2,5-pydc) and two 6-carboxynicotinate (2,5-Hpydc) ligands. The 2,5-pydc and 2,5-Hpydc ligands bridge Tb^III atoms, generating helical coordination polymers along [001]. An extensive network of O-HO hydrogen bonds is formed between the coordination polymers and the uncoordinated water molecules. The refined Flack parameter of 0.54 (2) suggests inversion twinning.

Online 19 March 2009

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