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In the title complex, [Cu(NO3)2(C10H8N2)], the CuII cation is chelated by two nitrate anions and by one 2,2′-bipyridine ligand in a distorted N2O4 octahedral geometry. The dihedral angle between the pyridine rings is 1.92 (11)°. In the crystal, π–π stacking between parallel pyridine rings of adjacent complex molecules is observed, the centroid–centroid distance being 3.6788 (19) Å. Weak C—H...O hydrogen bonds further link the molecules into a three-dimensional supramolecular architecture.

In the anion of the title compound, NH4+·C16H13O3−·2H2O, the benzene rings are twisted with respect to each other by 73.56 (10)°. In the crystal, extensive N—H...O and O—H...O hydrogen bonds link the cations, anions and lattice water molecules into a three dimensional supramolecular structure.