Cyclopentadienyltungsten tricarbonyl dimer

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.

Cyclopentadienyltungsten tricarbonyl dimer
Names
IUPAC name
bis(tricarbonyl[η5-cyclopentadienyl]tungsten)(W—W)
Other names
cyclopentadienyl tungsten carbonyl dimer
Bis(tricarbonylcyclopentadienyltungsten)
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.149.757
  • InChI=1S/2C5H5.6CO.2W/c2*1-2-4-5-3-1;6*1-2;;/h2*1-5H;;;;;;;;
    Key: QHDDHZCGENYXAV-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.[W].[W]
Properties
C16H10O6W2
Molar mass 665.93 g·mol−1
Appearance red 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).
Infobox references

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]

References
  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.{{cite journal}}: 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. ISBN 9780470132593.
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