Cyclopentadienylvanadium tetracarbonyl

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

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.

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]

References

^ King, R. B.; Stone, F. G. A. (1963). "Cyclopentadienyl Metal Carbonyls and Some Derivatives". Inorganic Syntheses. Vol. 7. p. 99. doi:10.1002/9780470132388.ch31.
^ Wilford, J.B.; Whitla, A.; Powell, H.M. (1967). "The Crystal and Molecular Structure of π-Cyclopentadienylvanadium Tetracarbonyl". Journal of Organometallic Chemistry. 8 (3): 495–502. doi:10.1016/S0022-328X(00)83671-2.
^ Fischer, Ernst Otto; Schneider, Robert J. J. (1970). "Über Aromatenkomplexe von Metallen, CXIV. Darstellung und Reaktionen von Dicyclopentadienyl-divanadin-pentacarbonyl, (C₅H₅)₂V₂(CO)₅". Chemische Berichte. 103 (11): 3684–3695. doi:10.1002/cber.19701031133.
^ King, R. B.; Stone, F. G. A. (1959). "π-Cylopentadienyl-π-Cycloheptatrienyl Vanadium". Journal of the American Chemical Society. 81 (19): 5263–5264. Bibcode:1959JAChS..81.5263K. doi:10.1021/ja01528a063.

[1] King, R. B.; Stone, F. G. A. (1963). "Cyclopentadienyl Metal Carbonyls and Some Derivatives". Inorganic Syntheses. Vol. 7. p. 99. doi:10.1002/9780470132388.ch31.

[2] Wilford, J.B.; Whitla, A.; Powell, H.M. (1967). "The Crystal and Molecular Structure of π-Cyclopentadienylvanadium Tetracarbonyl". Journal of Organometallic Chemistry. 8 (3): 495–502. doi:10.1016/S0022-328X(00)83671-2.

[3] Fischer, Ernst Otto; Schneider, Robert J. J. (1970). "Über Aromatenkomplexe von Metallen, CXIV. Darstellung und Reaktionen von Dicyclopentadienyl-divanadin-pentacarbonyl, (C₅H₅)₂V₂(CO)₅". Chemische Berichte. 103 (11): 3684–3695. doi:10.1002/cber.19701031133.

[4] King, R. B.; Stone, F. G. A. (1959). "π-Cylopentadienyl-π-Cycloheptatrienyl Vanadium". Journal of the American Chemical Society. 81 (19): 5263–5264. Bibcode:1959JAChS..81.5263K. doi:10.1021/ja01528a063.

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