Iridium tetroxide

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 (−267.15 °C; −448.87 °F). At higher temperatures, the oxide is unstable. The detection of the iridium tetroxide cation IrO+
4 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.

Iridium(VIII) oxide
Names
IUPAC name
Iridium(VIII) oxide
Identifiers
3D model (JSmol)
  • InChI=1S/Ir.4O
    Key: WIFDYPVIKSJTTM-UHFFFAOYSA-N
  • O=[Ir](=O)(=O)=O
Properties
IrO4
Molar mass 256.213 g·mol−1
Melting point −267.15 °C (−448.87 °F; 6.00 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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