Date Published: July 01, 2011
Publisher: International Union of Crystallography
Author(s): Chao-Jun Du, Xing-Hua Song, Li-Sheng Wang, Chao-Ling Du.
In the title compound, [Fe(C5H3N2O4)2(H2O)2], the FeII ion lies on an inversion centre and is coordinated by two N and two O atoms from two 5-carboxy-1H-imidazole-4-carboxylate ligands and two water molecules in a distorted octahedral geometry. An intramolecular O—H⋯O hydrogen bond occurs. In the crystal, intermolecular N—H⋯O and O—H⋯O hydrogen bonds form a three-dimensional network, which consolidates the packing.
For the diversity of coordination architectures of the metal atom in complexes with 4,5-dicarboxyimidazole, see: Shimizu et al. (2004 ▶); Fang & Zhang (2006 ▶). For the closely related crystal structures of the Zn, Mg and Cd complexes, see: Ma et al. (2003 ▶), Liu et al. (2004 ▶) and Zhang et al. (2004 ▶), respectively.