Pentamethylcyclopentadienyl iridium dichloride dimer
 |
|
| Names | |
|---|---|
|
IUPAC name
Di-µ-chloro-bis[chloro(pentamethylcyclopentadienyl)iridium(III)]
|
|
| Other names
Dichloro(pentamethylcyclopentadienyl)iridium(III)
|
|
| Identifiers | |
| ECHA InfoCard | 100.205.779 |
| Properties | |
| C20H30Cl4Ir2 | |
| Molar mass | 796.71 g/mol |
| Appearance | orange solid |
| Melting point | >230 °C |
| Dichloromethane, Chloroform | |
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|
|
 (what is   ?) |
|
| Infobox references | |
Pentamethylcyclopentadienyl iridium dichloride is an organometallic compound with the formula [(C5(CH3)5IrCl2)]2, commonly abbreviated [Cp*IrCl2]2 This bright orange air-stable diamagnetic solid is a reagent in organometallic chemistry.
The compound has C2hsymmetry. Each metal is pseudo-octahedral. It was first prepared by the reaction of hydrated iridium trichloride with hexamethyl Dewar benzene. More conveniently, the compound is prepared by the reaction of hydrated iridium trichloride and pentamethylcyclopentadiene in hot methanol, from which the product precipitates
The two Ir-μ-Cl bonds are labile and can be cleaved to give a variety of adducts of the general formula Cp*IrCl2L. Such adducts undergo further substitution to afford cations [Cp*IrClL2]+ and [Cp*IrL3]2+. The chloride ligands can also be replaced by other anions such as carboxylates, nitrite, and azide.
Reduction of [Cp*IrCl2]2 under an atmosphere of CO affords the dicarbonyl [Cp*Ir(CO)2], which can be decarbonylated to give the unsaturated derivative [Cp*Ir(CO)]2. Treatment of [Cp*IrCl2]2 with borohydride under an atmosphere of H2 gives the iridium(V) derivative Cp*IrH4.
[Cp*IrCl2]2 is a precursor to catalysts for the asymmetric transfer hydrogenation of ketones.
The chemistry of this compound is similar to that of its rhodium analog, the pentamethylcyclopentadienyl rhodium dichloride dimer.
...
Wikipedia