Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound
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.
^Cite error: The named reference Gong was invoked but never defined (see the help page).
^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.
^Cite error: The named reference himmel2010 was invoked but never defined (see the help page).
^Cite error: The named reference wang2014 was invoked but never defined (see the help page).
Iridiumtetroxide (IrO4, Iridium(VIII) oxide) is a binary compound of oxygen and iridium in oxidation state +8. This compound was formed by photochemical...
Riedel, S. (2009). "Formation and Characterization of the IridiumTetroxide Molecule with Iridium in the Oxidation State +VIII". Angewandte Chemie International...
P4O10. Tetroxides are rare, with a few more common examples being iridiumtetroxide, ruthenium tetroxide, osmium tetroxide, and xenon tetroxide. Reduction...
sesquiselenides are known, as well as IrS 3. Another oxide, iridiumtetroxide, is also known, with iridium in the +8 oxiation state. This compound was formed by...
Sebastian (2009). "Formation and Characterization of the IridiumTetroxide Molecule with Iridium in the Oxidation State +VIII". Angewandte Chemie International...
electron overall. While iridium is known to show a +8 state in iridiumtetroxide, as well as a unique +9 state in the iridiumtetroxide cation IrO+ 4, the...
observed in [(η2-O2)IrO2]+; see C&EN: Iridium dressed to the nines. Ir(VIII) has been observed in iridiumtetroxide (IrO4); see Gong, Yu; Zhou, Mingfei;...
been carried out to confirm that it behaves as the heavier homologue to iridium in group 9 as the seventh member of the 6d series of transition metals...
Sebastian (2009). "Formation and Characterization of the IridiumTetroxide Molecule with Iridium in the Oxidation State +VIII". Angewandte Chemie International...
tetrahedral ruthenium tetroxide, RuO4, an aggressive, strong oxidizing agent with structure and properties analogous to osmium tetroxide. RuO4 is mostly used...
launch complex with debris and toxic propellant (hydrazine and dinitrogen tetroxide), resulting in extensive damage. 16 months after the accident, the pad...
impregnation with osmium using variants of the OTO staining method (O-osmium tetroxide, T-thiocarbohydrazide, O-osmium). Nonconducting specimens may be imaged...
are used in two-component rocket fuels, often together with dinitrogen tetroxide, N2O4. A 50:50 mixture by weight of hydrazine and UDMH was used in the...
osmium tetroxide – a rather toxic chemical – he described its taste as astringent and pepper-like. In April 1845, he was poisoned by osmium tetroxide vapors...
two-stage launch vehicle with storable propellants, consisting of Nitrogen Tetroxide and Unsymmetrical Dimethylhydrazine. The launch vehicle was derived from...
consumed over a period of two months to three years). Exposure to osmium tetroxide (OsO4) may cause permanent eye damage and can lead to respiratory failure...
properties than other traditional propellants such as hydrazine and nitrogen tetroxide. The latter are pure liquids, which (except for trace contaminants) can...
are oxidizing agents such as potassium permanganate (KMnO4) and osmium tetroxide (OsO4). Compounds such as these are widely used for converting alkenes...
properties have been measured, such as enthalpy of adsorption of hassium tetroxide, but properties of hassium metal remain unknown and only predictions are...
common catalyst is granular alumina (aluminum oxide, Al2O3) coated with iridium. These coated granules are usually under the commercial labels Aerojet...
concentrated nitric acid. Antimony also forms a mixed-valence oxide, antimony tetroxide (Sb 2O 4), which features both Sb(III) and Sb(V). Unlike oxides of phosphorus...
hypophosphorous acid and the +4 oxidation state in hypophosphoric acid. Antimony tetroxide is a mixed-valence compound, where half of the antimony atoms are in the...
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