Received 23 February 2009
The title complex, [Fe(C6H4N5)2(H2O)2], was synthesized by the reaction of ferrous sulfate with 5-(2-pyridyl)-2H-tetrazole (HL). The FeII atom, located on a crystallographic center of inversion, is coordinated by four N-atom donors from two planar trans-related deprotonated L ligands and two O atoms from two axial water molecules in a distorted octahedral geometry. The FeII mononuclear units are further connected by intermolecular O-HN and C-HO hydrogen-bonding interactions, forming a three-dimensional framework.
For hydrogen bonds, see: Desiraju & Steiner (1999); Kitagawa & Uemura (2005); For general background, see: Rizk et al. (2005); Robin & Fromm (2006); For structurally related complexes with tetrazole ligands, see: Mo et al. (2004); Song et al. (2008); Tao et al. (2008); Wang et al. (2003); Wen (2008); Wu et al. (2007).
Data collection: SMART (Bruker, 1998); cell refinement: SAINT (Bruker, 1998); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: IM2104 ).
This work was supported by the Start-up Fund for PhDs in Natural Scientific Research of Zhengzhou University of Light Industry (grant No. 2006BSJJ001 to SMF). We also thank Dr Chun-Sen Liu for his helpful discussions and valuable suggestions.
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