Diacetonitrile-tetra-kis{μ(2)-3-anilinocarbonyl-1-[(5-chloro-2-oxidophen-yl)diazen-yl]-2-naphtholato}tetra-aqua-diiron(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 mol-ecule is a centrosymmetric dimer with two octa-hedral 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-oxidophen-yl)diazen-yl]-2-naph-tholate ligands. The Na(+) cation is coordinated by a carbonyl O atom from the two ligands of each octa-hedral Fe(III) unit, two water mol-ecules and the N atom of an acetonitrile mol-ecule. Two solvent water mol-ecules complete the structure. In the crystal structure, the dimeric mol-ecules are bridged by a pair of discrete inter-molecular O-H⋯O hydrogen bonds, one of which involves a sodium-bound water mol-ecule and a hydrate water, and the other a 5-chloro-phenolate O atom and a water molecule to form an extended chain along b.