Tris(2,2′-bipyridine-κ²N,N′)cobalt(III) bis­[bis­(pyridine-2,6-dicarboxyl­ato-κ³O²,N,O⁶)cobaltate(III)] perchlorate dimethyl­formamide hemisolvate 1.3-hydrate

In the title compound, [Co(C₁₀H₈N₂)₃][Co(C₇H₃NO₄)₂]₂(ClO₄)·0.5C₃H₇NO·1.3H₂O, the Co^III atom in the complex cation is pseudoocta­hedrally coordinated by six N atoms of three chelating bipyridine ligands. The Co^III atom in the complex anion is coordinated by two pyridine N atoms and four carboxyl­ate O atoms of two doubly deprotonated pyridine-2,6-dicarboxyl­ate ligands in a distorted octa­hedral geometry. One dimethyl­formamide solvent mol­ecule and two water mol­ecules are half-occupied and one water mol­ecule is 0.3-occupied. O—H...O hydrogen bonds link the water mol­ecules, the perchlorate anions and the complex anions. π–π inter­actions between the pyridine rings of the complex anions are also observed [centroid–centroid distance = 3.804 (3) Å].

Poly[μ-aqua-diaquabis­[μ-2-cyano-2-(oxidoimino)­acetato]­copper(II)dipotassium]

In the title compound, [CuK₂(C₃N₂O₃)₂(H₂O)₃]_n, the Cu²⁺ atom is in a distorted square-pyramidal coordination geometry. Two N atoms belonging to the oxime groups and two O atoms belonging to the carboxyl­ate groups of two trans-disposed doubly deprotonated residues of 2-cyano-2-(hy­droxy­imino)­acetic acid make up the basal plane and the apical position is occupied by the water mol­ecule. The neighboring Cu-containing moieties are linked into a three-dimensional framework by K—O and K—N contacts formed by two potassium cations with the carboxyl­ate and the oxime O atoms and the nitrile N atoms of the ligand. The environments of the K⁺ cations are complemented to octa- and nona­coordinated, by K—O contacts with H₂O mol­ecules. The crystal structure features O—H...O hydrogen bonds.