Polonium trioxide


Polonium trioxide is a chemical compound with the formula PoO3. It is one of three oxides of polonium, the other two being polonium monoxide and polonium dioxide. It is an interchalcogen. It has so far only been detected in traces.

Preparation

It has been reported that trace quantities of polonium trioxide form during the anodic deposition of polonium from acidic solutions; although there is no experimental evidence for this, the fact that the deposit dissolves in hydrogen peroxide suggests that it contains polonium in a high oxidation state. It has been predicted that polonium trioxide may be formed by heating polonium dioxide and chromium trioxide together in air.

Difficulty of preparation of polonium(VI) compounds

It is very difficult to oxidize polonium beyond Po; for example, the only hexahalide of polonium is the hexafluoride, PoF6, and fluorine is already the most electronegative element. However, the difficulty in obtaining polonium trioxide and polonates by direct oxidation of Po compounds may be due to the fact that polonium-210, while the most easily available isotope of polonium, is strongly radioactive. Similar work with curium shows that it is easier to achieve higher oxidation states with longer-lived isotopes; thus, it may be easier to obtain Po using the longer-lived polonium-208 or polonium-209. It has been suggested that Po might be more stabilized in anions such as or, like other high oxidation states.