Tetraethylammonium (2,2′-bipyridine)tetracyanidocobaltate(III) sesquihydrate acetonitrile solvate

The title complex, (C8H20N)[Co(CN)4(C10H8N2)]·CH3CN·1.5H2O, consists of tetraethyl ammonium cations, mononuclear [CoIIIbpy(CN)4]− anions and uncoordinated water and acetonitrile molecules. The CoIII atom is six-coordinated by two 2,2′-bipyridine (bpy) N atoms and four cyanide C atoms in a distorted octahedral geometry. The acute bite angle of the chelating bpy [82.28 (8)°] is the main factor accounting for this distortion. In addition, the tetraethylammonium cation is significantly disordered [occupancy ratio 0.611 (3):0.389 (3)]. The presence of water molecules, one of which is disordered over two positions about an inversion center, results in the formation of a network of O—H...N hydrogen bonds involving the cyanide N atoms