Diacetonitrile­tetra­kis{μ(2)-3-anilinocarbonyl-1-[(5-chloro-2-oxidophen­yl)diazen­yl]-2-naphtholato}tetra­aqua­diiron(III)disodium(I) dihydrate

The title compound, [Fe(2)Na(2)(C(23)H(14)ClN(3)O(3))(4)(C(2)H(3)N)(2)(H(2)O)(4)]·2H(2)O, is a hydrated Fe–azo complex dimer that is used as a charge-control agent in electrophotography. The mol­ecule is a centrosymmetric dimer with two octa­hedral Fe(III) units linked by two bridging five-coordinate Na(I) cations. Each Fe(III) atom is chelated by the N and two O atoms from two 3-anilinocarbonyl-1-[(5-chloro-2-oxidophen­yl)diazen­yl]-2-naph­tholate ligands. The Na(+) cation is coordinated by a carbonyl O atom from the two ligands of each octa­hedral Fe(III) unit, two water mol­ecules and the N atom of an acetonitrile mol­ecule. Two solvent water mol­ecules complete the structure. In the crystal structure, the dimeric mol­ecules are bridged by a pair of discrete inter­molecular O—H⋯O hydrogen bonds, one of which involves a sodium-bound water mol­ecule and a hydrate water, and the other a 5-chloro­phenolate O atom and a water molecule to form an extended chain along b.