Cyclopentadienyltungsten tricarbonyl dimer

Cyclopentadienyltungsten tricarbonyl dimer
Names
	IUPAC name bis(tricarbonyl[η5-cyclopentadienyl]tungsten)(W—W)
	Other names cyclopentadienyl tungsten carbonyl dimer; Bis(tricarbonylcyclopentadienyltungsten)
Identifiers
CAS Number	12566-66-4 ;
3D model (JSmol)	Interactive image;
ChemSpider	10159961;
ECHA InfoCard	100.149.757
PubChem CID	45051817;
	InChI InChI=1S/2C5H5.6CO.2W/c21-2-4-5-3-1;61-2;;/h2*1-5H;;;;;;;; Key: QHDDHZCGENYXAV-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.[W].[W];
Properties
Chemical formula	C16H10O6W2
Molar mass	665.93 g·mol−1
Appearance	red 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

Cyclopentadienyltungsten tricarbonyl dimer is the organotungsten compound with the formula Cp₂W₂(CO)₆, where Cp is C₅H₅. A dark red crystalline solid, it is the subject of research, although it has no or few practical uses.

Structure and synthesis

The molecule exists in two rotamers, gauche and anti.[1] The six CO ligands are terminal, and the W-W bond distance is 3.222 Å.[2] The compound is prepared by treatment of tungsten hexacarbonyl with sodium cyclopentadienide followed by oxidation of the resulting NaW(CO)₃(C₅H₅).[3]

Related compounds

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References

Brian Mann (1997-01-06). "Fluxionality of Cp₂Mo₂(CO)₆". University of Sheffield.
R. D. Adams, D. M. Collins, and F. A. Cotton (1974). "Molecular Structures and Barriers to Internal Rotation in Bis(η5 -cyclopentadienyl)hexacarbonylditungsten and Its Molybdenum Analog". Inorg. Chem. 13 (5): 1086–1090. doi:10.1021/ic50135a015.CS1 maint: multiple names: authors list (link)
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.

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[1] Brian Mann (1997-01-06). "Fluxionality of Cp₂Mo₂(CO)₆". University of Sheffield.

[2] R. D. Adams, D. M. Collins, and F. A. Cotton (1974). "Molecular Structures and Barriers to Internal Rotation in Bis(η5 -cyclopentadienyl)hexacarbonylditungsten and Its Molybdenum Analog". Inorg. Chem. 13 (5): 1086–1090. doi:10.1021/ic50135a015.CS1 maint: multiple names: authors list (link)

[3] 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.