Chromium carbonyl



Chromium carbonyl
IUPAC name chromium hexacarbonyl
Other names chromium carbonyl
Identifiers
CAS number 13007-92-6
RTECS number GB5075000
Properties
Molecular formula C6CrO6
Molar mass 220.06 g/mol
Appearance colorless crystals
Density 1.77 g/cm3, solid
Melting point

150 °C (decomposition)

Boiling point

sublimes

Solubility in water insoluble
Solubility in other solvents soluble in THF
Structure
Crystal structure orthrhombic
Coordination
geometry 		octahedral
Dipole moment 0 D
Hazards
Main hazards CO source
R-phrases R22
S-phrases S45
Related Compounds
Related compounds CrCl3
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Chromium carbonyl, also known as chromium hexacarbonyl, is the ligands are the same. The complex is octahedral with Cr-C and C-O distances of 1.92 and 1.17 Å, respectively.[1]

Reactions

When heated or photolyzed in aromatic solvent results in replacement of three CO ligands:

Cr(CO)6 + C6H5R → Cr(CO)3(C6H5R) + 3 CO

Such reactions proceed particularly well with electron-rich arenes such as air. In general, substituted derivatives of Cr(CO)6 decompose upon exposure to air.

Alkyl and aryl carbene become part of the new benzene ring.

Safety

In common with many of the other homoleptic metal carbonyls (e.g. carcinogenic. Its vapor pressure is relatively high for a metal complex, 1 mm Hg ( 36 °C).

References

  1. ^ Whitaker A.; Jeffery, J. W. “The Crystal Structure of Chromium Hexacarbonyl” Acta Crystallographica 1967, volume 23, pp. 977-984. doi:10.1107/S0365110X67004153.
  2. ^ Elschenbroich, C. ”Organometallics” (2006) Wiley-VCH: Weinheim. ISBN 978-3-29390-6
 
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