Crystal structure of di-μ-hydroxido-bis-[aqua-(1,10-phenanthroline-κ(2) N,N')copper(II)] naphthalene-2,6-di-carboxyl-ate hexa-hydrate.

In the title compound, [Cu2(OH)2(C12H8N2)2(H2O)2](C12H6O4)·6H2O, the two hydroxide groups bridge the two Cu(II) cations, forming a centrosymmetric binuclear complex cation, in which the Cu(II) cation is coordinated by a 1,10-phenanthroline (phen) mol-ecule, one water mol-ecule and two bridging hydroxide O atoms in a distorted N2O3 square-pyramidal coordination geometry. The naphthalene-2,6-di-carboxyl-ate anion is also located on an inversion centre. In the crystal, O-H⋯O hydrogen bonds link the cations, anions and lattice water mol-ecules into a three-dimensional supra-molecular architecture.