Ruthenium pentacarbonyl

Ruthenium pentacarbonyl is the organoruthenium compound with the formula Ru(CO)5. It is a colorless, light-sensitive liquid that readily decarbonylates upon standing at room temperature. It is of academic interest as an intermediate for the synthesis of metal carbonyl complexes.[2]

Ruthenium pentacarbonyl
Names
Other names
Pentacarbonylruthenium
Identifiers
3D model (JSmol)
ChemSpider
Properties
Ru(CO)5
Molar mass 241.12
Appearance colorless liquid
Melting point −16–17[1] °C (3–63 °F; 257–290 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Preparation

Ru(CO)5 was originally prepared by carbonylation of ruthenium salts in the presence of a reducing agent.[3] A more recent preparation involves photolysis of triruthenium dodecacarbonyl in the presence of carbon monoxide:[2]

Ru3(CO)12 + 3 CO ⇌ 3 Ru(CO)5

It is characterized by two intense νCO bands in the IR spectrum at 2038 and 2003 cm−1 (hexane solution).[2]

Comparisons of M(CO)5 (M = Fe, Ru, Os)

Whereas Fe(CO)5 is completely robust at room temperature, samples of Ru(CO)5 are typically reddish owing to contamination by Ru3(CO)12. The conversion is rapid in solution. Os(CO)5 requires heating to 80 °C to effect conversion to triosmium dodecacarbonyl.[1]

References
  1. Rushman, Paul; Van Buuren, Gilbert N.; Shiralian, Mahmoud; Pomeroy, Roland K. (1983). "Properties of the Pentacarbonyls of Ruthenium and Osmium". Organometallics. 2 (5): 693–694. doi:10.1021/om00077a026.
  2. Adams, R. D.; Barnard, T. S.; Cortopassi, J. E.; Wu, W.; Li, Z. "Platinum-ruthenium carbonyl cluster complexes" Inorganic Syntheses 1998, volume 32, pp. 280-284. doi:10.1002/9780470132630.ch44
  3. W. Manchot, Wilhelm J. Manchot "Darstellung von Rutheniumcarbonylen und -nitrosylen" Zeitschrift für Anorganische und Allgemeine Chemie 1936, volume 226, pp. 385-415. doi:10.1002/zaac.19362260410
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