Diphosgene Platinum Dichloride, PtCl₂.2COCl₂

Diphosgene Platinum Dichloride, PtCl₂.2COCl₂, was obtained by Pullinger as a non-volatile residue after passing streams of chlorine and carbon monoxide alternately over spongy platinum at 250° C. It is a yellow, crystalline solid, stable in dry air, but slightly deliquescent. It readily dissolves in water, but is recovered unaltered upon evaporation. When strongly heated it yields chlorine and phosgene together with a residue of metallic platinum.