Bis(μ-naphthalene-1,8-dicarboxyl­ato-κ(2) O (1):O (8))bis­[aqua­bis­(N,N′-dimethyl­formamide-κO)copper(II)]

In the centrosymmetric dinuclear title complex, [Cu(2)(C(12)H(6)O(4))(2)(C(3)H(7)NO)(4)(H(2)O)(2)], the coordination environment of each Cu(II) atom displays a distorted CuO(5) square-pyramidal geometry, which is formed by two carboxyl­ate O atoms of two μ-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) Å, with the Cu atom lying nearly in the plane [deviation = 0.0726 (2) Å]. The axial O atom occupies the peak position with a Cu—O distance of 2.885 (12) Å, which is significantly longer than the rest of the Cu—O distances. Each 1,8-nap ligand acts as bridge, linking two Cu(II) atoms into a dinuclear structure. Inter­molecular O—H⋯O and C—H⋯O hydrogen-bonding inter­actions consolidate the structure.