Vanadium(II) oxide
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| Names | |
|---|---|
| IUPAC name
Vanadium(II) oxide
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| Other names
Vanadium oxide
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| Identifiers | |
| ECHA InfoCard | 100.031.655 |
PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| VO | |
| Molar mass | 66.9409 g/mol |
| Appearance | grey solid with metallic lustre |
| Density | 5.758 g/cm3 |
| Melting point | 1,789 °C (3,252 °F; 2,062 K) |
| Boiling point | 2,627 °C (4,761 °F; 2,900 K) |
Refractive index (nD)
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1.5763 |
| Structure | |
| Halite (cubic), cF8 | |
| Fm3m, No. 225 | |
| Octahedral (V2+) Octahedral (O2−) | |
| Thermochemistry | |
Std molar
entropy (S⦵298) |
39.01 J/mol·K[1] |
Std enthalpy of
formation (ΔfH⦵298) |
-431.790 kJ/mol[1] |
Gibbs free energy (ΔfG⦵)
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-404.219 kJ/mol[1] |
| Hazards | |
| Flash point | Non-flammable |
| Related compounds | |
Other anions
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Vanadium monosulfide Vanadium monoselenide Vanadium monotelluride |
Other cations
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Niobium(II) oxide Tantalum(II) oxide |
| Vanadium(III) oxide Vanadium(IV) oxide Vanadium(V) oxide | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Vanadium(II) oxide, VO, is one of the many oxides of vanadium. VO is a long-lived, electronically neutral reagent chemical. It adopts a distorted NaCl structure and contains weak V−V metal to metal bonds. As shown by band theory, VO is a conductor of electricity due to its partially filled conduction band and delocalisation of electrons in the t2g orbitals. VO is a non-stoichiometric compound, its composition varying from VO0.8 to VO1.3.[2]
References
- ^ a b c R. Robie, B. Hemingway, and J. Fisher, “Thermodynamic Properties of Minerals and Related Substances at 298.15K and 1bar Pressure and at Higher Temperatures,” US Geol. Surv., vol. 1452, 1978.
- ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 982. ISBN 978-0-08-037941-8.
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