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
CAS Number	12566-66-4 Y
3D model (JSmol)	Interactive image
ChemSpider	10159961
ECHA InfoCard	100.149.757
PubChem CID	45051817
InChI InChI=1S/2C5H5.6CO.2W/c2*1-2-4-5-3-1;6*1-2;;/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
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]

Related compounds

• Cyclopentadienylmolybdenum tricarbonyl dimer
• Cyclopentadienylchromium tricarbonyl dimer