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—H⋯O and N—H⋯O hydrogen bonds, forming a three-dimensional supramolecular structure.
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