Crystal structure of rubidium cobalticyanide

The crystal structure of Rb 3 [Co(CN) 6 ] was determined by X-ray diffraction analysis. The crystals are monoclinic, space group P 2 1 / c , a = 7.163(2), b = 10.601(3), c = 8.675(3) Å, β = 107.83(2)°, V = 627.1(3) Å 3 , Z = 2, ρ calcd = 2.497 g/cm 3 , R = 0.0844, wR = 0.2090 for 769 measured reflections. The coordination polyhedron of the Co atom is the regular octahedron [Co(CN) 6 ]. The Rb(1) atoms are in the cavities of the octahedral structure; the Rb(2) atoms are in the cavities of the trigonal prisms, additional two atoms being more distant. All the cyano groups of the complex are in terminal positions.