3(NH4)2[IrCl6] + 18HCl + 12HNO3 → 6Cl3N + 3H2[IrCl6] + 12NO + 24H2O
Ammonium hexachloridoiridate(IV) react with hydrogen chloride and nitric acid to produce chlorine nitride, hydrogen hexachloridoiridate(IV), nitric oxide and water. This reaction takes place at a temperature of 0-10°C.