Pentamethylcyclopentadienyl ruthenium dichloride dimer
| File:Cp*2Ru2Cl4.png | |
| Names | |
|---|---|
| IUPAC name
Di-µ-chloro-bis[chloro(pentamethylcyclopentadienyl)ruthenium(III)]
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| Other names
Dichloro(pentamethylcyclopentadienyl)ruthenium(III)
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| Identifiers | |
| Properties | |
| C20H30Cl4Ru2 | |
| Appearance | brown solid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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 a very 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.
Preparation, structure, reactions
The compound has C2h symmetry. 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.[1]
It is prepared by the reaction of hydrated ruthenium trichloride with pentamethylcyclopentadiene.[2]
- 2 Cp*H + 2 RuCl3(H2O)3 → [Cp*RuCl2]2 + 2 HCl + 6 H2O
The reaction is accompanied by formation of decamethylruthenocene.
Pentamethylcyclopentadienyl ruthenium dichloride can reduced to the diamagnetic tetramer of Ru(II):
- 2 [Cp*RuCl2]2> + 2 Zn → [Cp*RuCl]4] + 2 ZnCl2
Methoxide also can be used to produce a related diruthenium(II) derivative, which is also diamagnetic:
- [Cp*RuCl2]2> + 3 NaOCH3 + HOCH3 → [Cp*RuOCH3]2] + 3 NaCl + CH2O + HCl
See also
- (Cymene)ruthenium dichloride dimer - [(cymene)RuCl2]2
- Pentamethylcyclopentadienyl iridium dichloride dimer - [Cp*IrCl2]2
References
- ^ McGrady, John E. "[(Cp*RuCl)2(μ-Cl)2]: bond-stretch or spin-state isomerism?" Angewandte Chemie International Edition (2000), volume 39, p. 3077-3079. doi:10.1002/1521-3773(20000901)39:17<3077::AID-ANIE3077>3.0.CO;2-B
- ^ Di-μ-Chloro-Bis[(η5-Pentamethylcyclopentadienyl) Chlororuthenium(III)], [Cp*RuCl2]2 and Di-μ-methoxo-Bis(η5-Pentamethylcyclopentadienyl)diruthenium(II), [Cp*RuOMe]2" U. Koelle, J. Kossakowski, Inorganic Syntheses 1992, volume 29, 225–228, doi:10.1002/9780470132609.ch52