Bis[(cyanido-κC)bis(1,10-phenanthroline-κ²N,N′)copper(II)] pentakis­(cyanido-κC)nitro­soferrate(II) dimethyl­formamide monosolvate

The title compound, [Cu(CN)(C₁₂H₈N₂)₂]₂[Fe(CN)₅(NO)]·C₃H₇NO, is formed of discrete [Cu(phen)₂CN]⁺ cations (phen is 1,10-phenanthroline), nitro­prusside [Fe(CN)₅(NO)]²⁻ anions and dimethyl­formamide (DMF) mol­ecules of crystallization. The metal atom has a distorted trigonal–bipyra­midal coordination environment, defined by four N atoms of two phen mol­ecules and a C atom of the cyanide group (in the equatorial position). The [Fe(CN)₅(NO)]²⁻ anion was found to be disordered about (but not on) a crystallographic twofold rotation axis. Geometries were restrained to ideal values. The dimethyl­formamide solvent mol­ecule was found to be disordered about a crystallographic inversion centre.

Tetra­kis(μ₂-cyanido-κ²C:N)dicyanido­tetra­kis­[tris­(2-amino­eth­yl)amine-κ³N,N′,N′′,N′′′]tetra­copper(II)iron(II) bis[pentacyanidonitrosoferrate(II)] hexahydrate

The asymmetric unit of the title complex, [Cu₄Fe(CN)₆(C₆H₁₈N₄)₄][Fe(CN)₅(NO)]₂·6H₂O, comprises a complex [{Cu(tren)CN}₄Fe(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).