Bis(μ-naphthalene-1,8-dicarboxylato-κ2O1/O8)bis[aquabis(N,N′-dimethylformamide-κO)copper(II)]

In the centrosymmetric dinuclear title complex, [Cu-2(C12H6O4)(2)(C3H7NO)(4)(H2O)(2)], the coordination environment of each Cu(II) atom displays a distorted CuO5 square-pyramidal geometry, which is formed by two carboxylate O atoms of two mu-1,8-nap ligands (1,8-nap is naphthalene-1,8-dicarboxylate), two O atoms of two DMF (DMF is N,N'-dimethylformamide) and one coordinated water molecule. The Cu-O distances involving the four O atoms in the square plane are in the range 1.9501 (11)-1.9677 (11) A, with the Cu atom lying nearly in the plane [deviation = 0.0726 (2) A]. The axial O atom occupies the peak position with a Cu-O distance of 2.885 (12) A, which is significantly longer than the rest of the Cu-O distances. Each 1,8-nap ligand acts as bridge, linking two CuII atoms into a dinuclear structure. Intermolecular O-H...O and C-H...O hydrogen-bonding interactions consolidate the structure.