3HgI2 + 6KNH2 → Hg3N2 + 6KI + 4NH3
or
3HgI2 + 2KNH2 + 2NH3 → Hg3N2 + 2KI + 4NH4I[8]
Mercury(II) iodide react with potassium to amide produce mercury(II) nitride, potassium iodide and ammonia. The reaction is conducted in a liquid ammonia at a temperature near -40°C[8]. mercury(II) nitride setting-out [16].