Iridium tetroxide

Iridium(VIII) oxide
Names
	IUPAC name Iridium(VIII) oxide
Identifiers
CAS Number	474103-25-8;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/Ir.4O Key: WIFDYPVIKSJTTM-UHFFFAOYSA-N;
	SMILES O=[Ir](=O)(=O)=O;
Properties
Chemical formula	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

Iridium tetroxide (IrO₄, Iridium(VIII) oxide) is a binary compound of oxygen and iridium in oxidation state +8.^[1] 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.^[2] 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.^[3]^[4] However no salts are known, as attempted production of an Ir(IX) salt such as IrO₄SbF₆ did not result in anything.

References

^ 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. PMID 19593837.
^ Citra, Angelo; Andrew, Lester (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. 103 (21): 4182–4190. Bibcode:1999JPCA..103.4182C. doi:10.1021/jp990388o.
^ Himmel, D.; Knapp, C.; Patzschke, M.; Riedel, S. (2010). "How far can we go? Quantum-chemical investigations of oxidation state IX". ChemPhysChem. 11 (4): 865–869. doi:10.1002/cphc.200900910. PMID 20127784.
^ 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 (7523): 475–477. Bibcode:2014Natur.514..475W. doi:10.1038/nature13795. PMID 25341786. S2CID 4463905.

External links

Media related to Iridium tetroxide at Wikimedia Commons

[Gong-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. PMID 19593837.

[Citra-2] Citra, Angelo; Andrew, Lester (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. 103 (21): 4182–4190. Bibcode:1999JPCA..103.4182C. doi:10.1021/jp990388o.

[himmel2010-3] Himmel, D.; Knapp, C.; Patzschke, M.; Riedel, S. (2010). "How far can we go? Quantum-chemical investigations of oxidation state IX". ChemPhysChem. 11 (4): 865–869. doi:10.1002/cphc.200900910. PMID 20127784.

[wang2014-4] 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 (7523): 475–477. Bibcode:2014Natur.514..475W. doi:10.1038/nature13795. PMID 25341786. S2CID 4463905.

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