Platinum Monophosphide, PtP

Platinum Monophosphide, PtP, was presumably obtained by Pelletier in 1792 as the result of heating platinum and phosphorus tog ther until the metal had absorbed 18 per cent, of the phosphorus. The same phosphide is also obtained by boiling the complex Pt₃P₅, mentioned above, with aqua regia for many hours, whereby a residue of monophosphide is obtained, the diphosphide passing into solution.