Iridium Tetroxide
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Iridium Tetroxide
Iridium(VIII) oxide
IUPAC name
Iridium(VIII) oxide
Molar mass  g·mol-1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Iridium tetroxide (IrO4, Iridium(VIII) oxide) is a binary compound of oxygen and iridium in oxidation state +VIII.[1] This compound was formed by photochemical rearrangement of [(?1-O2)IrO2] in solid argon at a temperature of 6 K (-267.15 °C; -448.87 °F). At higher temperatures, the oxide is unstable.[2] The detection of the iridium tetroxide cation by infrared photodissociation spectroscopy with formal oxidation state IX has been reported.[3][4]


  1. ^ Gong, Yu; Zhou, Mingfei; Kaupp, Martin; Riedel, Sebastian (2009). "Formation and Characterization of the Iridium Tetroxide Molecule with Iridium in the Oxidation State +VIII". Angewandte Chemie International Edition. 48 (42): 7879-7883. doi:10.1002/anie.200902733.
  2. ^ Citra, Angelo; Andrew, Lester (1999). "Reactions of Laser-Ablated Iridium Atoms with O2. Infrared Spectra and DFT Calculations for Iridium Dioxide and Peroxo Iridium(VI) Dioxide in Solid Argon". J. Phys. Chem. A. 103 (21): 4182-4190. doi:10.1021/jp990388o.
  3. ^ Himmel, D.; Knapp, C.; Patzschke, M.; Riedel, S. (2010). "How far can we go? Quantum-chemical investigations of oxidation state IX". ChemPhysChem. 11: 865-869. doi:10.1002/cphc.200900910.
  4. ^ Wang, Guanjun; Zhou, Mingfei; Goettel, James T.; Schrobilgen, Gary J.; Su, Jing; Li, Jun; Schlöder, Tobias; Riedel, Sebastian (23 October 2014). "Identification of an iridium-containing compound with a formal oxidation state of IX". Nature. 514: 475-477. doi:10.1038/nature13795.

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