Bis(μ-hydroxido-κ(2) O:O)bis[bis(5-car-boxy-pyridine-2-carboxyl-ato-κ(2) N,O (2))iron(III)] dihydrate.

The complete binuclear complex in [Fe2(C7H4NO4)4(OH)2]·2H2O, is generated by the application twofold symmetry. The Fe(III) atom is coordinated by the O atoms of two bridging hydroxyl groups and by two N and two O atoms from two pyridine-2,5-di-carboxyl-ato ligands, forming a distorted octa-hedral geometry. The Fe⋯Fe separation within the dinuclear complex is 3.0657†(4)†à . In the crystal, O-H⋯O and C-H⋯O hydrogen-bonding inter-actions connect the mol-ecules into a three-dimensional supra-molecular network.