The cocrystal μ-oxalato-κ(4) O (1),O (2):O (1′),O (2′)-bis­(aqua­(nitrato-κO){[1-(2-pyridyl-κN)eth­ylidene]hydrazine-κN}copper(II)) μ-oxalato-κ(4) O (1),O (2):O (1′),O (2′)-bis­((methanol-κO)(nitrato-κO){[1-(2-pyridyl-κN)eth­ylidene]hydrazine-κN}copper(II)) (1/1)

The title cocrystal, [Cu(2)(C(2)O(4))(NO(3))(2)(C(7)H(9)N(3))(2)(H(2)O)(2)][Cu(2)(C(2)O(4))(NO(3))(2)(C(7)H(9)N(3))(2)(CH(4)O)(2)], is a 1:1 cocrystal of two centrosymmetric Cu(II) complexes with oxalate dianions and Schiff base ligands. In each mol­ecule, the Cu(II) centre is in a distorted octa­hedral cis-CuN(2)O(4) environment, the donor atoms of the N,N′-bidentate Schiff base ligand and the bridging O,O′-bidentate oxalate group lying in the equatorial plane. In one mol­ecule, a monodentate nitrate anion and a water mol­ecule occupy the axial sites, and in the other, a monodentate nitrate anion and a methanol mol­ecule occupy these sites. In the crystal structure, inter­molecular N—H⋯O, O—H⋯O and N—H⋯N hydrogen bonds link the mol­ecules into a network. Weak intra­molecular N—H⋯O inter­actions are also observed.