Cyclopentadienylchromium tricarbonyl dimer

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Cyclopentadienylchromium tricarbonyl dimer
Cp2Cr2(CO)6.svg
Names
IUPAC name
bis(tricarbonyl[η5-cyclopentadienyl]chromium)(CrCr)
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
  • [C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[CH]1[CH][CH][CH][CH]1.[CH]1[CH][CH][CH][CH]1.[Cr].[Cr]
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[edit]

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]

Related compounds[edit]

References[edit]

  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, M25‐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.