Tetra­kis(μ(2)-cyanido-κ(2) C:N)dicyanido­tetra­kis­[tris­(2-amino­eth­yl)amine-κ(3) N,N′,N′′,N′′′]tetra­copper(II)iron(II) bis[pentacyanidonitrosoferrate(II)] hexahydrate

The asymmetric unit of the title complex, [Cu(4)Fe(CN)(6)(C(6)H(18)N(4))(4)][Fe(CN)(5)(NO)](2)·6H(2)O, comprises a complex [{Cu(tren)CN}(4)Fe(CN)(2)](4+) [tren is tris­(2-amino­eth­yl)amine] cation, which exhibits -1 symmetry with the terminal cyanide ligands oriented trans to each other, and two [Fe(CN)(5)(NO)](2−) nitroprussiate counter-anions. In the crystal, N—H⋯N hydrogen-bonding inter­actions are observed between H atoms on the primary amine groups of the tren ligand and the terminal cyanide groups of the nitro­prussiate counter-ions. The N atom in the terminal CN ligand of the cation is equally disordered over two positions. The structure also contains disordered lattice water mol­ecules. Their contribution was elimin­ated from the refinement using the procedure described by van der Sluis & Spek (1990 ▶).