Kaliumheptachlorodioxodimolybdat(V), KMo2O2Cl7

Potassium Heptachlorodioxodimolybdate(V), KMo₂O₂Cl₇ KMo₂O₂Cl₇ was obtained at 400 °C from the reaction of SCl₂ with molybdenum which contained traces of potassium. Its crystal structure is monoclinic, space group C2/c, a = 1094.1, b = 1139.1, c = 1018.0 pm, β = 110.16°, Z = 4. In the Mo₂O₂Cl₇^– ion two coordination octahedra share a common face with three chlorine atoms. The crystal structure can be derived from the CsNiCl₃ type by vacating one third of the Ni and two thirds of the Cs positions. The crystallographic group-subgroup relationship is given.