Pentamethylcyclopentadienyl rhodium dichloride dimer
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| Names | |
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IUPAC name
Di-µ-chloro-bis[chloro(pentamethylcyclopentadienyl)rhodium(III)]
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| Other names
Dichloro(pentamethylcyclopentadienyl)rhodium(III)
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| Identifiers | |
| Properties | |
| C20H30Cl4Rh2 | |
| Molar mass | 618.07 g·mol−1 |
| Appearance | red solid |
| Dichloromethane, Chloroform | |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Pentamethylcyclopentadienyl rhodium dichloride is an organometallic compound with the formula [(C5(CH3)5RhCl2)]2, commonly abbreviated [Cp*RhCl2]2 This dark red air-stable diamagnetic solid is a reagent in organometallic chemistry.
The compound has idealized C2hsymmetry. Each metal centre is pseudo-octahedral. It was first prepared by the reaction of hydrated rhodium trichloride with hexamethyl Dewar benzene and can be used as a starting material for synthesising some pentamethylcyclopentadienyl organometallic compounds including [Cp*Rh(CO)2].
The compound is more conveniently prepared by the reaction of rhodium trichloride trihydrate and pentamethylcyclopentadiene in hot methanol, from which the product precipitates:
The Rh-μ-Cl bonds are labile and cleave en route to a variety of adducts of the general formula Cp*RhCl2L. Treatment with silver ions in polar solvents causes precipitation of silver(I) chloride, leaving a solution containing dications of the form [Cp*RhL3]2+ (L = H2O, MeCN).
The chemistry is similar to that of its iridium analog, the pentamethylcyclopentadienyl iridium dichloride dimer.
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