Kaliumtetrachlorooxomolybdat(V), KMoOCl4

Potassium Tetrachlorooxomolybdate(V), KMoOCl₄ KMoOCl₄ was obtained at 200 °C in small yield as a side‐product from the reaction of S₂Cl₂ with molybdenum which contained 0.7% of potassium (the main product was MoS₂Cl₃). Attempts to increase the yield by adding stoichiometric amounts of KOH or of KCl + H₂O failed. An attempt to produce KMoOCl₄ by the reduction of MoOCl₄ with KI yielded K₃Mo₂Cl₉ and a small amount of K₂MoOCl₅. The crystal structure of KMoOCl₄ is monoclinic, space group P2₁/c, a = 657,1; b = 901,6; c = 2327,3 pm; β = 92,81°, Z = 8. Square‐pyramidal MoOCl₄^– ions are associated to infinite zigzag chains by Mo…Cl contacts.