Pentamethylcyclopentadienyl ruthenium dichloride dimer

Pentamethylcyclopentadienyl ruthenium dichloride dimer
Names
IUPAC name
Di-µ-chloro-bis[chloro(pentamethylcyclopentadienyl)ruthenium(III)]
Other names
Dichloro(pentamethylcyclopentadienyl)ruthenium(III)
Identifiers
82091-73-4 YesY
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).
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 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

References

  1. ↑ 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
  2. ↑ 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
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