Received 30 May 2011
aDepartment of Chemical and Biochemical Engineering, Nanyang Institute of Technology, 473004 Nanyang, Henan, People's Republic of China,bSchool of Chemical Engineering and Environment, Beijing Institute of Technology, 100081 Beijing, People's Republic of China, and cCollege of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, People's Republic of China
Correspondence e-mail: email@example.com
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-HO hydrogen bond occurs. In the crystal, intermolecular N-HO and O-HO 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.
Data collection: APEX2 (Bruker, 2005); cell refinement: SAINT (Bruker, 2005); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: CV5111 ).
Bruker (2005). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.
Fang, R. Q. & Zhang, X. M. (2006). Inorg. Chem. 45, 4801-4810.
Liu, J.-W., Gao, S., Huo, L.-H., Gu, C.-S., Zhao, H. & Zhao, J.-G. (2004). Acta Cryst. E60, m1697-m1699.
Ma, C.-B., Chen, F., Chen, C.-N. & Liu, Q.-T. (2003). Acta Cryst. C59, m516-m518.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Shimizu, E., Kondo, M., Fuwa, Y., Sarker, R. P., Miyazawa, M., Ueno, M., Naito, T., Maeda, K. & Uchida, F. (2004). Inorg. Chem. Commun. 7, 1191-1194.
Zhang, X.-M., Fang, R.-Q., Wu, H.-S. & Ng, S. W. (2004). Acta Cryst. E60, m12-m13.