Acta Cryst. (2007). E63, m2151-m2152  [ doi:10.1107/S160053680703320X ]

catena-Poly[[diaqua(isonicotinato-²O,O')gadolinium(III)]-di--isonicotinato-⁴O:O']

F.-Y. Chen, W.-T. Wu, F. Liu, L. Yao and S.-Y. He

Abstract: Single crystals of the title compound, [Gd(C₆H₄NO₂)₃(H₂O)₂]_n, were obtained by evaporation of an aqueous solution of isonicotinic acid and gadolinium(III) nitrate. The Gd^III cation is eight-coordinated by four carboxylate O atoms of bridging isonicotinate anions, two carboxylate O atoms of a chelating isonicotinate anion and two water molecules. The coordination environment around the rare earth cation might be described as a distorted bicapped trigonal prism. As a result of the two coordination modes of the isonicotinate ligands (with one as a bidentate chelate ligand and the others as bridging ligands), an infinite chain along the a axis is formed. Medium-strength hydrogen bonds of the types O-HO and O-HN between the water molecules and adjacent chains generate a three-dimensional framework.

Online 18 July 2007

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