Iridium tetroxide

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title: "Iridium tetroxide" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["iridium-compounds", "substances-discovered-in-the-2000s", "transition-metal-oxides", "oxycations"] topic_path: "general/iridium-compounds" source: "https://en.wikipedia.org/wiki/Iridium_tetroxide" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

| Name = Iridium(VIII) oxide | ImageFile = Ruthenium-tetroxide-3D-balls.png | ImageSize = 100px | IUPACName = Iridium(VIII) oxide | Section1 = {{Chembox Identifiers | CASNo = 474103-25-8 | SMILES = O=Ir(=O)=O | StdInChI=1S/Ir.4O | StdInChIKey = WIFDYPVIKSJTTM-UHFFFAOYSA-N | Section2 = {{Chembox Properties | Ir=1 | O=4 | MeltingPt = Decomposes at | MeltingPtC = −267.15

Iridium tetroxide (IrO4, Iridium(VIII) oxide) is a binary compound of oxygen and iridium in oxidation state +8. This compound was formed by photochemical rearrangement of (η1-O2)IrO2 in solid argon at a temperature of 6 K. At higher temperatures, the oxide is unstable. The detection of the iridium tetroxide cation by infrared photodissociation spectroscopy with formal oxidation state +9 has been reported, the highest currently known of any element. However no salts are known, as attempted production of an Ir(IX) salt such as IrO4SbF6 did not result in anything.

References

References

  1. (1999). "Reactions of Laser-Ablated Iridium Atoms with O2. Infrared Spectra and DFT Calculations for Iridium Dioxide and Peroxoiridium(VI) Dioxide in Solid Argon". J. Phys. Chem. A.
  2. (2009). "Formation and Characterization of the Iridium Tetroxide Molecule with Iridium in the Oxidation State +VIII". Angewandte Chemie International Edition.
  3. (2010). "How far can we go? Quantum-chemical investigations of oxidation state IX". ChemPhysChem.
  4. (23 October 2014). "Identification of an iridium-containing compound with a formal oxidation state of IX". Nature.

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iridium-compoundssubstances-discovered-in-the-2000stransition-metal-oxidesoxycations