Received 23 May 2012
In the title complex, [Ni(C6H5O2N2)2], the NiII atom is situated on an inversion centre and is coordinated in a square-planar geometry by four O atoms and two N atoms of the chelating ligands.
For applications of complexes derived from 2-methylpyrazine-5-carboxylic acid, see: Chapman et al. (2002); Ptasiewicz-Bak & Leciejewicz (2000); Tanase et al. (2006); Wang et al. (2008) For a related structure, see: Liu et al. (2007).
Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); 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.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: RU2036 ).
We gratefully acknowledge the Scientific Research Program Funded by Shaanxi Provincial Education Department (Nos. 11 J K0578 and 2010 J K882), the Natural Science Foundation of Shaanxi Province (No. 2010JQ2007) and the Open Foundation of the Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education.
Bruker (2004). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.
Chapman, C. T., Ciurtin, D. M., Smith, M. D. & Loye zur, H. C. (2002). Solid State Sci. 4, 1187-1189.
Liu, F.-Y., Shang, R.-L., Du, L., Zhao, Q.-H. & Fang, R.-B. (2007). Acta Cryst. E63, m120-m122.
Ptasiewicz-Bak, H. & Leciejewicz, J. (2000). Pol. J. Chem. 74, 877-883.
Sheldrick, G. M. (1996). SADABS. University of Göttingen, Germany.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Tanase, S., Martin, V. S., Van Albada, G. A., DeGelder, R., Bouwman, E. & Reedijk, J. (2006). Polyhedron, 25, 2967-2975.
Wang, F. Q., Mu, W. H., Zheng, X. J., Li, L. C., Fang, D. C. & Jin, L. P. (2008). Inorg. Chem. 47, 5225-5233.