Ruthenium pentacarbonyl
Chemical compound
From Wikipedia, the free encyclopedia
Ruthenium pentacarbonyl is the ruthenium 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]
5structure.png)
| |
| Names | |
|---|---|
| Other names
Pentacarbonylruthenium | |
| Identifiers | |
3D model (JSmol) |
|
| ChemSpider | |
PubChem CID |
|
| |
| |
| 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).
| |
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]