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Tetrairidium dodecacarbonyl

Tetrairidium dodecacarbonyl
IUPAC name Tetrairidium dodecacarbonyl
Other names iridium(0) carbonyl; iridium carbonyl; iridium dodecacarbonyl
CAS number 18827-81-1
Molecular formula C12O12Ir4
Molar mass 1104.92 g/mol
Appearance Canary-yellow crystals
Melting point

195 °C

Solubility Chlorocarbons, toluene, tetrahydrofuran
Related Compounds
Related compounds Tetrarhodium dodecacarbonyl
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Tetrairidium dodecacarbonyl is the chemical compound with the formula Ir4(CO)12. This tetrahedral cluster is the most common and most stable "binary" carbonyl of iridium. This air-stable species is only poorly soluble in organic solvents. It has been used to prepare bimetallic clusters and catalysts, e.g. for the water gas shift reaction, and reforming, but these studies are of purely academic interest.


Each Ir center is octahedral, being bonded to 3 other iridium atoms and three CO ligands. Ir4(CO)12 has Td symmetry. The related clusters Rh4(CO)12 and Co4(CO)12 have C3v symmetry because of the presence of three bridging CO ligands in each.


It is prepared in two steps by reductive carbonylation of hydrated iridium trichloride. The first step give [Ir(CO)2Cl2]-.[1]

IrCl3 + 3 CO + H2O → [Ir(CO)2Cl2]- + HCl- + CO2 + H+
4 [Ir(CO)2Cl2]- + 6 CO + 2 H2O → Ir4(CO)12 + 2 CO2 + 4 H+ + 8 Cl-


  1. ^ Pergola, R. D.; Garlaschelli, L.; Matinengo, S. (1990). "Dodecacarbonyltetrairidium: Ir4(CO)12". Inorganic Syntheses 28: 245-247. doi:10.1002/9780470132593.ch63.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Tetrairidium_dodecacarbonyl". A list of authors is available in Wikipedia.
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