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

The title complex, (C(8)H(20)N)[Co(CN)(4)(C(10)H(8)N(2))]center dot CH(3)CN center dot-1.5H(2)O, consists of tetraethyl ammonium cations, mononuclear [Co(III)bpy(CN)(4)](-) anions and uncoordinated water and acetonitrile molecules. The Co(III) 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)degrees] 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 center dot center dot center dot N hydrogen bonds involving the cyanide N atoms.