Pentamethylcyclopentadienyl ruthenium dichloride dimer
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| Names | |
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IUPAC name
Di-μ-chlorido-bis[chlorido(pentamethyl-η5-cyclopentadienyl)ruthenium(III)]
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| Other names
Di-µ-chloro-bis[chloro(pentamethylcyclopentadienyl)ruthenium(III)]
Dichloro(pentamethylcyclopentadienyl)ruthenium(III) |
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| Identifiers | |
82091-73-4 
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| Properties | |
| C20H30Cl4Ru2 | |
| Appearance | brown solid |
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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 ruthenium dichloride is an organoruthenium chemistry with the formula [(C5(CH3)5)RuCl2]2, commonly abbreviated [Cp*RuCl2]2. This brown paramagnetic solid is a reagent in organometallic chemistry. It is an unusual example of a compound that exists as isomers that differ in the intermetallic separation, a difference that is manifested in a number of physical properties.
The compound has C2hsymmetry. Each metal is pseudo-octahedral. Two isomers are observed in the unit cell, one with an Ru-Ru bond (2.93 Å) and one with a long internuclear distance of 3.75Å. The former isomer is thought to be diamagnetic, and the latter is magnetic.
It is prepared by the reaction of hydrated ruthenium trichloride with pentamethylcyclopentadiene.
The reaction is accompanied by formation of decamethylruthenocene.
Pentamethylcyclopentadienyl ruthenium dichloride can reduced to the diamagnetic tetramer of Ru(II):
Methoxide also can be used to produce a related diruthenium(II) derivative, which is also diamagnetic:
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