- Tetrairidium dodecacarbonyl
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Tetrairidium dodecacarbonyl 
dodecacarbonyl- 1κ3C,2κ3C,3κ3C,4κ3C-[Td-(13)-Δ4-closo]-
tetrairidium(6 Ir—Ir)Other namesiridium(0) carbonyl; iridium carbonyl; iridium dodecacarbonylIdentifiers CAS number 18827-81-1 Properties 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 
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)Infobox 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.
Structure
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.
Preparation
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]− + CO2 + 2 H+ + Cl−
- 4 [Ir(CO)2Cl2]− + 6 CO + 2 H2O → Ir4(CO)12 + 2 CO2 + 4 H+ + 8 Cl−
References
- ^ Pergola, R. D.; Garlaschelli, L.; Matinengo, S. (1990). "Dodecacarbonyltetrairidium: Ir4(CO)12". Inorganic Syntheses. Inorganic Syntheses (New York: J. Wiley & Sons) 28: 245–247. doi:10.1002/9780470132593.ch63. ISBN 0-471-52619-3.
Iridium compounds Categories:- Iridium compounds
- Carbonyl complexes
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