Crystal structure of di-μ-hydroxido-bis­[aqua­(1,10-phenanthroline-κ2N,N′)copper(II)] naphthalene-2,6-di­carboxyl­ate hexa­hydrate

In the title compound, [Cu2(OH)2(C12H8N2)2(H2O)2](C12H6O4)·6H2O, the two hydroxide groups bridge the two CuII cations, forming a centrosymmetric binuclear complex cation, in which the CuII cation is coordinated by a 1,10-phenanthroline (phen) mol­ecule, one water mol­ecule and two bridging hydroxide O atoms in a distorted N2O3 square-pyramidal coordination geometry. The naphthalene-2,6-di­carboxyl­ate anion is also located on an inversion centre. In the crystal, O—H⋯O hydrogen bonds link the cations, anions and lattice water mol­ecules into a three-dimensional supra­molecular architecture. Extensive π–π stacking is observed between the parallel or nearly parallel aromatic rings of adjacent phen ligands and naphthalenedi­carboxyl­ate anions, the centroid-to-centroid distances ranging from 3.4990 (16) to 3.8895 (16) A.