Iridium(IV) oxide
Chemical compound / From Wikipedia, the free encyclopedia
Iridium(IV) oxide, IrO2, is the only well-characterised oxide of iridium. It is a blue-black solid. The compound adopts the TiO2 rutile structure, featuring six coordinate iridium and three coordinate oxygen.[1]
Quick Facts Names, Identifiers ...
Names | |
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Other names
Iridium dioxide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.031.572 |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
IrO2 | |
Molar mass | 224.22 g/mol |
Appearance | blue-black solid |
Density | 11.66 g/cm3 |
Melting point | 1,100 °C (2,010 °F; 1,370 K) decomposes |
insoluble | |
+224.0·10−6 cm3/mol | |
Structure | |
Rutile (tetragonal) | |
Octahedral (Ir); Trigonal (O) | |
Hazards | |
Flash point | Non-flammable |
Related compounds | |
Other anions |
iridium(IV) fluoride, iridium disulfide |
Other cations |
rhodium dioxide, osmium dioxide, platinum dioxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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It is used with other rare oxides in the coating of anode-electrodes for industrial electrolysis and in microelectrodes for electrophysiology research.[2]
As described by its discoverers, it can be formed by treating the green form of iridium trichloride with oxygen at high temperatures:
- 2 IrCl3 + 2 O2 → 2 IrO2 + 3 Cl2
A hydrated form is also known.[3]