Cyclopentadienylvanadium tetracarbonyl

Cyclopentadienylvanadium tetracarbonyl is the organovanadium compound with the formula (C₅H₅)V(CO)₄. An orange, diamagnetic solid, it is the principal cyclopentadienyl carbonyl of vanadium. It can be prepared by heating a solution of vanadocene under high pressure of carbon monoxide.^[1] As confirmed by X-ray crystallography, the coordination sphere of vanadium consists of η⁵-cyclopentadienyl and four carbonyl ligands. The molecule is a four-legged piano stool complex.^[2] The compound is soluble in common organic solvents. The compound has no commercial applications.

Cyclopentadienylvanadium tetracarbonyl

Identifiers
CAS Number	12108-04-2
3D model (JSmol)	Interactive image
EC Number	235-163-9
PubChem CID	498652
CompTox Dashboard (EPA)	DTXSID20153143
InChI InChI=1S/C5H5.4CO.V/c1-2-4-5-3-1;4*1-2;/h1-5H;;;;; Key: LIFGJKDEFQAOFY-UHFFFAOYSA-N
SMILES C1=C[CH-]C=C1.[O+]#C[V-3](C#[O+])(C#[O+])C#[O+]
Properties
Appearance	orange solid
Density	1.56 g/cm3
Boiling point	sublimes
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H311, H315, H319, H330, H335
Precautionary statements	P260, P261, P264, P270, P271, P280, P284, P301+P310, P302+P352, P304+P340, P305+P351+P338, P310, P312, P320, P321, P322, P330, P332+P313, P337+P313, P361, P362, P363, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Reactions

Reduction of cyclopentadienylvanadium tetracarbonylwith sodium amalgam gives the tricarbonyl dianion:

CpV(CO)₄ + 2 Na → Na₂CpV(CO)₃ + CO

Protonation of this salt gives Cp₂V₂(CO)₅.^[3]

Heating a mixture of cycloheptatriene and cyclopentadienylvanadium tetracarbonyl gives (cycloheptatrienyl)(cyclopentadienyl)vanadium ("trovacene").^[4]