catena-Poly[[[diaquaterbium(III)]-μ-6-carboxynicotinato-μ-pyridine-2,5-dicarboxylato] dihydrate]
oleh: Sheng Li, Fu-Li Zhang, Shou-Bin Wang, Hui-Ling Bai
| Format: | Article |
|---|---|
| Diterbitkan: | International Union of Crystallography 2009-04-01 |
Deskripsi
The title compound, {[Tb(C7H3NO4)(C7H4NO4)(H2O)2]·2H2O}n, is isotypic with the analogous TmIII compound [Li, Zhang, Wang & Bai (2009). Acta Cryst. E65, m411]. The TbIII 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 TbIII atoms, generating helical coordination polymers along [001]. An extensive network of O—H...O hydrogen bonds is formed between the coordination polymers and the uncoordinated water molecules. The refined Flack parameter of 0.54 (2) suggests inversion twinning.