Molybdenum diphosphideMolybdenum diphosphide is a binary inorganic compound of molybdenum metal and phosphorus with the chemical formula.SynthesisMolybdenum diphosphide can be obtained by heating molybdenum with red phosphorus in a closed tube at 550 °C:PropertiesMolybdenum diphosphide forms black crystals of orthorhombic crystal system with space group A21am. It is insoluble in water. It decomposes when heated, releasing molybdenum monophosphide and white phosphorus:UsesMolybdenum diphosphide can be used as a catalyst.