Xenon Tetroxide - Synthesis

Synthesis

All syntheses start from the perxenates, which are accessible from the xenates through two methods. One is the disproportionation of xenates to perxenates and xenon:

2 HXeO4– + 2 OH– → XeO64– + Xe + O2 + 2 H2O

The other is oxidation of the xenates with ozone in basic solution:

HXeO4– + O3 + 3 OH– → XeO64– + O2 + 2 H2O

Barium perxenate is reacted with sulfuric acid and the unstable perxenic acid is dehydrated to give xenon tetroxide:

Ba2XeO6 + 2 H2SO4 → 2 BaSO4 + H4XeO6
H4XeO6 → 2 H2O + XeO4

Any excess perxenic acid slowly undergoes a disproportionation reaction to xenic acid and oxygen:

2 H4XeO6 → O2 + 2 H2XeO4 + 2 H2O

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