Osmium(II) chlorideOsmium chloride or osmium dichloride is an inorganic compound composed of osmium metal and chlorine with the chemical formula.SynthesisOsmium chloride can be prepared by disproportionation of osmium chloride at 500 °C in vacuum:UsesOsmium chloride can be used for the catalytic production of trialkylamines.ReactionsOsmium chloride reacts with carbon monoxide at 220 °C: