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Tetrairidium dodecacarbonyl

Chemical compound From Wikipedia, the free encyclopedia

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.[1][2][3] 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.

Quick facts Names, Identifiers ...
Tetrairidium dodecacarbonyl
Names
IUPAC names
dodecacarbonyl-1κ3C,2κ3C,3κ3C,4κ3C-[Td-(13)-Δ4-closo]-tetrairidium(6 Ir—Ir)
tetrahedro-tetrakis(tricarbonyliridium)(6 Ir—Ir)
Other names
  • Iridium(0) carbonyl
  • Iridium carbonyl
  • Iridium dodecacarbonyl
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.038.718 Edit this at Wikidata
EC Number
  • 242-607-5
  • InChI=1S/12CO.4Ir/c12*1-2;;;;
    Key: XWDKRVSSHIJNJP-UHFFFAOYSA-N
  • [O+]#C[Ir-3]12(C#[O+])(C#[O+])[Ir-3]3(C#[O+])(C#[O+])(C#[O+])[Ir-3]1(C#[O+])(C#[O+])(C#[O+])[Ir-3]23(C#[O+])(C#[O+])C#[O+]
Properties
Ir4(CO)12
Molar mass 1104.92 g/mol
Appearance Canary-yellow crystals
Melting point 195 °C (383 °F; 468 K)
Solubility Soluble in chlorocarbons, toluene, tetrahydrofuran
Related compounds
Related compounds
 Tetrarhodium dodecacarbonyl
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Structure

Each Ir center is octahedral, being bonded to 3 other iridium atoms and three terminal CO ligands. Ir4(CO)12 has Td symmetry with an average Ir-Ir distances of 2.693 Å.[4] 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 gives [Ir(CO)2Cl2]−.[5]

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−

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