Thermal stability of some platinum complexes

The thermal decomposition of some platinum(II) and platinum(IV) complexes was studied using thermogravimetric and differential thermal analysis (TG and DTA) techniques. The platinum complexes studied were: dihydrogen hexachloroplatinate(IV) (H2PtCl6 · 6 H2O); ammonium tetrachloroplatinate(II) [(NH4)2PtCl4]; diammineplatinum(II) nitrite [(NH3)2− Pt(NO2)2]; tetraammineplatinum(II) nitrate [Pt(NH3)4 (NO3)2] and tetraammineplatinum(II) chloride [Pt(NH3)4Cl2 · H2O]. Thermal analysis was carried out under an atmosphere of helium, hydrogen or oxygen (60 ml min−1). Generally, a lower thermal stability under hydrogen atmosphere than helium or oxygen atmospheres was observed. Endothermal decomposition of chlorine complexes and exothermal decomposition of nitrite and nitrate complexes were also observed.