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
CAS Number	12194-12-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	9037595;
PubChem CID	134871162; 10862305;
	InChI InChI=1S/2C5H5.6CO.2Cr/c21-2-4-5-3-1;61-2;;/h2*1-5H;;;;;;;; Key: VIBRSGQAZCSDSN-UHFFFAOYSA-N;
	SMILES [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
Chemical formula	C16H10Cr2O6
Molar mass	402.242 g·mol−1
Appearance	green solid
Density	2.738 g/cm3
Solubility in water	insoluble
Hazards
Main hazards	flammable
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

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]

Related compounds

References

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.
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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[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.