Syntheses and Characterizations of the Mixed Noble‐Gas Compounds, [FKrIIFXeIIF][AsF6]⋅0.5 KrIIF2⋅2 HF, ([KrII2F3][AsF6])2⋅XeIVF4, and XeIVF4⋅KrIIF2

Reaction of [XeF][AsF₆ ] with excess KrF₂ at -78 °C in anhydrous HF (aHF) solvent has yielded the first mixed Kr^II /Xe^II noble-gas compound, [FKrFXeF][AsF₆ ] ⋅0.5 KrF₂ ⋅2 HF, a salt of the [FKrFXeF]⁺ cation. The potent oxidative fluorinating properties of Kr^II fluoride species resulted in oxidation of Xe^II to Xe^IV in aHF at -60 °C to form the mixed Kr^II /Xe^IV cocrystals, ([Kr₂ F₃ ][AsF₆ ])₂ ⋅XeF₄ and XeF₄ ⋅KrF₂ . Further decomposition at 22 °C …