Cyclopentadienylchromium tricarbonyl dimer

Cyclopentadienylchromium tricarbonyl dimer
Names
IUPAC name
bis(tricarbonyl[η5-cyclopentadienyl]chromium)(Cr—Cr)
Other names
cyclopentadienyl chromium carbonyl dimer
Bis(tricarbonylcyclopentadienylchromium)
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/2C5H5.6CO.2Cr/c2*1-2-4-5-3-1;6*1-2;;/h2*1-5H;;;;;;;;
    Key: VIBRSGQAZCSDSN-UHFFFAOYSA-N
  • c1[cH-]ccc1.[O+]#C[Cr-2](C#[O+])(C#[O+])[Cr-2](C#[O+])(C#[O+])(C#[O+]).c1[cH-]ccc1
Properties
C16H10Cr2O6
Molar mass 402.242 g·mol−1
Appearance green solid
Density 2.738 g/cm3
insoluble
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 flammable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Cyclopentadienylchromium tricarbonyl dimer is the organochromium compound with the formula Cp2Cr2(CO)6, where Cp is C5H5. A dark green crystalline solid. It is the subject of research it exists in measureable equilibrium quantities with the monometallic radical CpCr(CO)3.

Structure and synthesis

The six CO ligands are terminal, and the Cr-Cr bond distance is 3.281 Å, 0.06 Å longer than the related dimolybdenum compound.[1] The compound is prepared by treatment of chromium hexacarbonyl with sodium cyclopentadienide followed by oxidation of the resulting NaCr(CO)3(C5H5).[2]

References

  1. ^ Adams, Richard D.; Collins, Douglas E.; Cotton, F. Albert (1974). "Unusual structural and magnetic resonance properties of dicyclopentadienylhexacarbonyldichromium". Journal of the American Chemical Society. 96 (5): 749–754. doi:10.1021/ja00810a019.
  2. ^ Manning, A. R.; Hacket, Paul; Birdwhistell, Ralph (1990). "Hexacarbonylbis(η5‐Cyclopentadienyl)Dichromium, Molybdenum, and Tungsten and their Analogs, M2(η5‐C5H4R)2(CO)6 (M = Cr, Mo, and W; R = H, Me or PhCH2)". Inorganic Syntheses. 28: 148–149. doi:10.1002/9780470132593.ch39. ISBN 9780470132593.

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