Received 17 December 2012
In the title compound, [Ni(C6H12N4O3)2](NO3)2·4H2O, the NiII cation is located on an inversion center and is N,O,O'-chelated by two nitrilotris(acetamide) molecules in a distorted octahedral geometry. The complex cations, nitrate anions and lattice water molecules are connected by O-HO and N-HO hydrogen bonds, forming a three-dimensional supramolecular structure.
Data collection: SMART (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); 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: XU5668 ).
This research was supported by the International Cooperation Special Fund of the Ministry of Science and Technology, China (No. 2011DFB31620). We are grateful to Professor Dr S.-M. Qiu of Hubei Academy of Agricultural Science for his valuable suggestions.
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