Iridium tetroxide (IrO₄, Iridium(VIII) oxide) is a binary

compound Compound may refer to: Architecture and built environments * Compound (enclosure), a cluster of buildings having a shared purpose, usually inside a fence or wall ** Compound (fortification), a version of the above fortified with defensive struc ...

oxygen Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as ...

and

iridium Iridium is a chemical element with the symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, it is considered the second-densest naturally occurring metal (after osmium) with a density of ...

oxidation state In chemistry, the oxidation state, or oxidation number, is the hypothetical charge of an atom if all of its bonds to different atoms were fully ionic. It describes the degree of oxidation (loss of electrons) of an atom in a chemical compound. C ...

+8. This compound was formed by photochemical rearrangement of ( η¹-O₂)IrO₂ in solid

argon Argon is a chemical element with the symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third-most abundant gas in Earth's atmosphere, at 0.934% (9340 ppmv). It is more than twice as ...

at a temperature of . At higher temperatures, the oxide is unstable. The detection of the iridium tetroxide cation by

infrared photodissociation spectroscopy Infrared photodissociation (IRPD) spectroscopy uses infrared radiation to break bonds in ions, ( photodissociate), within a mass spectrometer. IRPD spectroscopy has been shown to use electron ionization, corona discharge, and electrospray ionizatio ...

with formal oxidation state +9 has been reported, the highest currently known of any element. However no

salts In chemistry, a salt is a chemical compound consisting of an ionic assembly of positively charged cations and negatively charged anions, which results in a compound with no net electric charge. A common example is table salt, with positively c ...

are known, as attempted production of an Ir(IX) salt such as IrO₄SbF₆ did not result in anything.

References

External links

* {{Oxides Tetroxide Substances discovered in the 2000s Transition metal oxides Oxycations