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This compound of uranium called uranium hexoxide or uranium (XII) oxide is a theoretical chemical compound. The uranium should have an oxidation state of +12 ,the highest of any known chemical. The closest is the $\ce{[IrO4]+}$ cation with iridium having an oxidation state of +9 so this is obviously mind blowing. Does this compound exist or has it been synthesized yet,without it spontaneously decomposing?

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    $\begingroup$ The oxidation number may not be +$12$, if the oxygen atoms are part of peroxy groups ·O-O·, where their oxidation number is -$1$. $\endgroup$
    – Maurice
    Commented Apr 29, 2021 at 8:36
  • $\begingroup$ @maurice it's more complicated than that. The references describe oxygen in multiple ligand states, including not only peroxide but also superoxide and even monovalent radical oxygen ($\ce{-O•}$). $\endgroup$ Commented May 20, 2021 at 1:09
  • $\begingroup$ The oxidation state of +12 was later disputed by a later paper because the octahedral species has coordination with oxygen atoms in various oxidation states such as oxo $\ce{O^2−}$, oxido(1) $\ce{O^{•−}}$, peroxido $\ce{O2^{2−}}$, and superoxido $\ce{O2^{•−}}$ ligands. $\endgroup$ Commented Apr 20 at 2:39

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