Vanadium(II) oxide
IUPAC name
Vanadium(II) oxide
Other names
Vanadium oxide
3D model (JSmol)
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  • [V+2].[O-2]
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)
Halite (cubic), cF8
Fm3m, No. 225
Octahedral (V2+)
Octahedral (O2−)
39.01 J/mol·K[1]
-431.790 kJ/mol[1]
-404.219 kJ/mol[1]
Flash point Non-flammable
Related compounds
Other anions
Vanadium monosulfide
Vanadium monoselenide
Vanadium monotelluride
Other cations
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 is the inorganic compound with the idealized formula VO. It is one of the several binary vanadium oxides. It adopts a distorted NaCl structure and contains weak V−V metal to metal bonds. VO is a semiconductor owing to delocalisation of electrons in the t2g orbitals. VO is a non-stoichiometric compound, its composition varying from VO0.8 to VO1.3.[2]

Diatomic VO is one of the molecules found in the spectrum of relatively cool M-type stars.[3] A potential use of vanadium(II) monoxide is as a molecular vapor in synthetic chemical reagents in low-temperature matrices.[4]


  1. ^ 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.
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 982. ISBN 978-0-08-037941-8.
  3. ^ Tsuji, T. (1986). "Molecules in Stars". Annu. Rev. Astron. Astrophys. 24: 94. Bibcode:1986ARA&A..24...89T. doi:10.1146/annurev.aa.24.090186.000513.
  4. ^ Groshens, Thomas J.; Klabunde, Kenneth J. (August 1990). "Molecular vapor synthesis: the use of titanium monoxide and vanadium monoxide vapors as reagents". Inorganic Chemistry. 29 (16): 2979–2982. doi:10.1021/ic00341a025. ISSN 0020-1669.