μ-4,4′-Diazenediyldiphthalato-κ(2) O (2):O (2′)-bis­[penta­aqua­manganese(II)] tetra­hydrate

The dinuclear complex in the title compound, [Mn(2)(C(16)H(6)N(2)O(8))(H(2)O)(10)]·4H(2)O, lies on an inversion center. Two delocalized carboxyl­ate groups are each connected in a monodentate fashion to two similar penta­aqua­manganese units, whereas the other two localized carboxyl­ate groups are uncoordinated. The metal ion has octa­hedral coordination, with the O atom of a carboxyl­ate group and three coordinated water mol­ecules forming the equatorial plane [Mn—O(COO) = 2.143 (4) Å] and two water mol­ecules occupying the axial positions. The architecture is further consolidated by extensive hydrogen bonds for which coordinated water mol­ecules serve as donors or acceptors.