$O_{2}^{+} P t F_{6}^{-}$ (an orange coloured compound) was prepared and thus, formation of compound $X e^{+} P t F_{6}^{-}$ was feasible based on ionisation energy of Xe (which is very similar to that of $O_{2}$ ).
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Solution

In 1962, Neil Bartlett discovered that a mixture of platinum hexafluoride gas and oxygen formed a red solid. The red solid turned out to be dioxygynyhexaflorinate, $O^{2 +} [P t F_{6}]^{2 -}$ .
Bartlett noticed that the ionization energy for $O_{2}$ (1175 kJ mol1) was very close to the ionization energy for Xe (1170 kJ mol1). He then established that xenon indeed reacts with $P t F_{6}$ . Although, as discussed above, the product was probably a mixture of several compounds, Bartlett's work was the first proof that compounds could be prepared from a noble gas.

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