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Ruthenocene

Ruthenocene
Ruthenocene Eclipsed Conformer Structural Formula.svg
Ruthenocene-from-xtal-3D-balls.png
Ruthenocene-from-xtal-3D-SF.png
Names
IUPAC names
Ruthenocene
Bis(η5-cyclopentadienyl)ruthenium
Other names
ruthenium cyclopentadienyl, cp2Ru
Identifiers
1287-13-4 YesY
3D model (Jmol) Interactive image
ECHA InfoCard 100.013.696
PubChem 11986121
Properties
C10H10Ru
Molar mass 231.26 g/mol
Appearance pale yellow powder
Density 1.86 g/cm3 (25 °C)
Melting point 195 to 200 °C (383 to 392 °F; 468 to 473 K)
Boiling point 278 °C (532 °F; 551 K)
Insoluble in water, soluble in most organic solvents
Hazards
Irritant Xi
R-phrases R36/37/38
S-phrases S26, S28, S37/39, S45
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Related compounds
Related compounds
 , nickelocene, chromocene, ferrocene, osmocene, bis(benzene)chromium
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY  (what is YesYN ?)
Infobox references

Ruthenocene is an organoruthenium compound with the formula (C5H5)2Ru. This pale yellow, volatile solid is classified as a sandwich compound and more specifically, as a metallocene.

Ruthenocene consists of a ruthenium ion sandwiched in between two cyclopentadienyl rings. It features ruthenium centre bound symmetrically to the planes of two cyclopentadienyl rings. It is closely related to the isoelectronic ferrocene.

In contrast to ferrocene, wherein the cyclopentadienyl rings are in a staggered conformation, those of ruthenocene crystallise with an eclipsed conformation. This difference is due to the larger ionic radius of ruthenium, which increases the distance between the cyclopentadienyl rings, decreasing steric interactions and allowing an eclipsed conformation to prevail. In solution, these rings rotate with a very low barrier.

Ruthenocene was first synthesized in 1952 by Geoffrey Wilkinson, a Nobel laureate who had collaborated in assigning the structure of ferrocene only a year earlier. Originally, ruthenocene was prepared by the reaction of ruthenium trisacetylacetonate with excess of cyclopentadienylmagnesium bromide.

Ruthenocene may also be prepared by the reaction of sodium cyclopentadienide with "ruthenium dichloride" (prepared from ruthenium metal and ruthenium trichloride in situ).

Ruthenocene typically oxidises via two electron change, instead of one. With weakly coordinating anions as electrolyte, the oxidation proceeds via a 1e step.

Ruthenocene has been investigated as a photoinitiator for polymerization reactions.


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