Bis(2,2'-bi­pyridine)­nitratocopper(II) nitrate

The title complex, [Cu(C₁₀H₈N₂)₂(NO₃)]NO₃, is the first reported unsolvated [Cu(bipy)₂(NO₃)]NO₃ structure (bipy is 2,2'-bi­pyridine). The Cu^II atom of the [Cu(bipy)₂(NO₃)]⁺ complex is six-coordinated, forming a distorted octahedral geometry; bond lengths to the N atoms of the pyridine rings and one of the O atoms of the chelating NO₃ ligand lie in the range 1.975 (5)-2.139 (6) Å, with the second O atom from the NO₃ ligand less tightly coordinated at a distance of 2.520 (6) Å. The geometry of the CuN₂N'₂OO' chromophore more closely resembles that of [Cu(bipy)₂(NO₂)]⁺ complexes than previously reported [Cu(bipy)₂(NO₃)]⁺ structures.