Olesia Kozachuk

Bis[chloridobis(1,10-phenanthroline)copper(II)] penta­cyanido­nitro­soferrate(II) di­methyl­formamide monosolvate

The title complex [CuCl(C12H8N2)2]2[Fe(CN)5(NO)]·C3H7NO, consists of discrete [Cu(phen)2Cl]+ cations (phen is 1,10-phenanthroline), [Fe(CN)5NO]2− anions and one dimethylformamide (DMF) solvent molecule of crystallization per asymmetric unit. The CuII atom is coordinated by two phenanthroline ligands and one chloride ion in a distorted trigonal–bipyramidal geometry. The dihedral angle between the phen ligands is 77.92 (7)°. The cation charge is balanced by a disordered nitroprusside counter-anion with the FeII atom located on an inversion center with a slightly distorted octahedral coordination geometry. In the crystal, weak C—H⋯N and C—H⋯Cl hydrogen bonds connect anions and cations into a two-dimensional network parallel to (100). In addition, π–π stacking interactions are observed with centroid–centroid distances in the range 3.565 (2)–3.760 (3)Å. The dimethylformamide solvent molecule was refined as disordered about an inversion center.

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 ▶).