Potassium Dithiodioxymolybdate, K₂MoO₂S₂

Potassium Dithiodioxymolybdate, K₂MoO₂S₂, separates as yellow needles from the oily liquid obtained when finely powdered dry potassium trimolybdate is added to a somewhat warm solution of potassium hydrogen sulphide, and alcohol added. It is a hygroscopic substance, soluble in water, and readily decomposed by mineral acids. A compound K₈Mo₄S₉O₇ is also said to be obtained from the oily liquid. A compound KHMo₂S₃O₇ is also known, as well as the salts KHMoS₅ and KMoS₆.H₂O.