Osmium pentacarbonyl

Identifiers

CAS Number

* 16406-49-8

3D model (JSmol)

* Interactive image

ChemSpider |

* 65793451

PubChem CID

* 10892861

InChI

* InChI=1S/5CO.Os/c5*1-2;

Key: RLUHVGZGDXPTEM-UHFFFAOYSA-N

SMILES

* C(=O)=[Os](=C=O)(=C=O)(=C=O)=C=O

Properties

Chemical formula

| C5O5Os
Molar mass | 330.28 g·mol−1
Appearance  | colorless liquid
Melting point |  2–2.5 °C (35.6–36.5 °F; 275.1–275.6 K)

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

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Osmium pentacarbonyl is the organoosmium compound with the formula Os(CO)5. It is the simplest isolatable carbonyl complex of osmium. Osmium pentacarbonyl is a colorless volatile liquid that is obtained by treating solid triosmium dodecacarbonyl under 200 atmospheres of carbon monoxide at 280-290 °C. In contrast, also at 200 atm of CO, solid Ru3(CO)12 converts to Ru(CO)5 at milder temperature of 160 °C.[1]

## Reactions

Structure proposed for Os2(CO)9.[2]

Samples of Os(CO)5 convert back to the trioosmium cluster upon heating to 80 °C. The analogous conversion of Ru(CO)5 back to Ru3(CO)12 occurs at room temperature.[1] Chlorination of the pentacarbonyl gives a cationic pentacarbonyl complex:[1]

Os(CO)5 \+ Cl2 → [Os(CO)5Cl]+Cl−

Upon UV irradiation, hexane solutions of the pentacarbonyl react with ethylene to give mono-, di-, and trisubstituted derivatives:[3]

Os(CO)5 \+ n C2H4 → Os(CO)5-n(C2H4)n \+ n CO (n = 1,2,3)

## References

1. ↑ 1.0 1.1 1.2 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. ↑ Moss, John R.; Graham, William A. G. (1977). "The Enneacarbonyls of Ruthenium and Osmium". Journal of the Chemical Society, Dalton Transactions: 95. doi:10.1039/DT9770000095.
3. ↑ Kiel, Gong Yu; Takats, Josef; Grevels, Friedrich Wielhelm (1987). "Multisubstitution of Os(CO)5 by ethylene: Isomeric Os(CO)2(C2H4)3 and a Derivative of Os(CO)(C2H4)4". Journal of the American Chemical Society 109 (7): 2227–2229. doi:10.1021/ja00241a075.

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Osmium compounds

Os(0)|

* Os3(CO)12

Os(0,I)|

* H2Os3(CO)10

Os(I)|

* OsB

Os(I,II)|

* Os2B3

Os(II)|

* OsB2

| Organoosmium(II) compounds|

* Os(C5H5)2

|

Os(IV)|

* OsO2
* OsCl4

Os(VI)|

* OsF6

Os(VIII)|

* OsO4
* OsS4

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