Acta Cryst. (2007). E63, m2438-m2439  [ doi:10.1107/S1600536807041657 ]

catena-Poly[[[diaqua(6-carboxypyridine-2-carboxylato)holmium(III)]--pyridine-2,6-dicarboxylato] tetrahydrate]

Z. Li, S. Wang, Q. Zhang and X. Yu

Abstract: The title compound, {[Ho(C₇H₃NO₄)(C₇H₄NO₄)(H₂O)₂]·4H₂O}_n, prepared by hydrothermal synthesis, is isostructural with its La^III-, Ce^III-, Pr^III-, Nd^III-, Sm^III-, Gd^III- and Tb^III-containing analogues. The Ho^III ion is nine-coordinated by four O and two N atoms from two independent pyridine-2,6-dicarboxylate groups, one carboxylate O atom belonging to a neighboring pyridine-2,6-dicarboxylate ligand and two water molecules. The bridging pyridine-2,6-dicarboxylate ligand gives rise to infinite chains. The crystal structure contains O-HO hydrogen bonds, which connect the chains into a three-dimensional network.

Online 29 August 2007

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