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
  • 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
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.

References

  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.
  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.
  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.
  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.

External links

  • Media related to Iridium tetroxide at Wikimedia Commons
  • v
  • t
  • e
Iridium compounds
Iridium(0)
  • Ir4(CO)12
Iridium(I)
Organoiridium(I)
  • IrC8H12C5H5NP(C6H11)3PF6
  • IrClCO(P(C6H5)3)2
  • KIrI2(CO)2
Iridium(II)
  • IrCl2
Iridium(III)
  • IrBr3
  • IrCl3
  • IrF
    3
  • IrI3
  • Ir2S3
  • Ir(O2C5H7)3
  • (NH
    4    )
    3    IrCl
    6
  • Ir(CN)3−
    6
  • Ir2O3
Organoiridium(III)
  • (IrClC5(CH3)5)2Cl2
  • Ir(C9H11)3
Iridium(IV)
  • IrBr
    4
  • IrF4
  • IrCl4
  • IrI
    4
  • IrO2
  • IrS2
  • (NH4)2[IrCl6]
  • Li2IrO3
Iridium(V)
  • IrF5
Iridium(VI)
  • IrF6
  • Sr2MgIrO6
  • Sr2CaIrO6
  • Ir(O2)O2
Iridium(VII)
  • IrF7
Iridium(VIII/IX)
  • IrO4
    • IrO4+
  • v
  • t
  • e
Oxides
Mixed oxidation states
+1 oxidation state
+2 oxidation state
+3 oxidation state
  • Actinium(III) oxide (Ac2O3)
  • Aluminium oxide (Al2O3)
  • Americium(III) oxide (Am2O3)
  • Antimony trioxide (Sb2O3)
  • Arsenic trioxide (As2O3)
  • Berkelium(III) oxide (Bk2O3)
  • Bismuth(III) oxide (Bi2O3)
  • Boron trioxide (B2O3)
  • Caesium sesquioxide (Cs2O3)
  • Californium(III) oxide (Cf2O3)
  • Cerium(III) oxide (Ce2O3)
  • Chromium(III) oxide (Cr2O3)
  • Cobalt(III) oxide (Co2O3)
  • Dinitrogen trioxide (N2O3)
  • Dysprosium(III) oxide (Dy2O3)
  • Einsteinium(III) oxide (Es2O3)
  • Erbium(III) oxide (Er2O3)
  • Europium(III) oxide (Eu2O3)
  • Gadolinium(III) oxide (Gd2O3)
  • Gallium(III) oxide (Ga2O3)
  • Gold(III) oxide (Au2O3)
  • Holmium(III) oxide (Ho2O3)
  • Indium(III) oxide (In2O3)
  • Iron(III) oxide (Fe2O3)
  • Lanthanum oxide (La2O3)
  • Lutetium(III) oxide (Lu2O3)
  • Manganese(III) oxide (Mn2O3)
  • Neodymium(III) oxide (Nd2O3)
  • Nickel(III) oxide (Ni2O3)
  • Phosphorus trioxide (P4O6)
  • Praseodymium(III) oxide (Pr2O3)
  • Promethium(III) oxide (Pm2O3)
  • Rhodium(III) oxide (Rh2O3)
  • Samarium(III) oxide (Sm2O3)
  • Scandium oxide (Sc2O3)
  • Terbium(III) oxide (Tb2O3)
  • Thallium(III) oxide (Tl2O3)
  • Thulium(III) oxide (Tm2O3)
  • Titanium(III) oxide (Ti2O3)
  • Tungsten(III) oxide (W2O3)
  • Vanadium(III) oxide (V2O3)
  • Ytterbium(III) oxide (Yb2O3)
  • Yttrium(III) oxide (Y2O3)
+4 oxidation state
+5 oxidation state
+6 oxidation state
+7 oxidation state
+8 oxidation state
Related
Oxides are sorted by oxidation state. Category:Oxides