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| IUPAC name chromium(II) oxide | |
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| Properties | |
| Chemical formula | CrO |
| Molar mass | 67.996 g/mol |
| Appearance | black |
| Melting point | 300 °C (572 °F; 573 K) (decomposes) |
| Structure | |
| Crystal structure | cubic, cF8 |
| Space group | Fm3m, No. 225 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).
 N verify (what is ?)
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Chromium(II) oxide (CrO) is an inorganic compound composed of chromium and oxygen. It is a black powder that crystallises in the rock salt structure. Hypophosphites may reduce chromium(III) oxide to chromium(II) oxide:
- H3PO2 + 2 Cr2O3 → 4 CrO + H3PO4
It is readily oxidized by the atmosphere. CrO is basic, while CrO3 is acidic, and Cr2O3 is amphoteric.
CrO occurs in the spectra of luminous red novae, which occur when two stars collide. It is not known why red novae are the only objects that feature this molecule; one possible explanation is an as-yet-unknown nucleosynthesis process.
See also
References
- Satish. Anand, Raj. Kumar (1989), Dictionary of Inorganic Chemistry, Anmol Publications, ISBN 978-81-7041-236-6
- Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5
- Chemistry 7th edition, by Raymond Chang page 645 (problem 15.100)
- Kamiński, T.; Mason, E.; Tylenda, R.; Schmidt, M. R. (2015). "Post-outburst spectra of a stellar-merger remnant of V1309 Scorpii: From a twin of V838 Monocerotis to a clone of V4332 Sagittarii". Astronomy & Astrophysics. 580: A34. arXiv:1504.03421. Bibcode:2015A&A...580A..34K. doi:10.1051/0004-6361/201526212. S2CID 118566357.
| Chromium compounds | |||
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| Chromium(0) |
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| Chromium(I) |
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| Chromium(II) |
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| Chromium(II, III) | |||
| Chromium(III) | |||
| Chromium(IV) | |||
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| Chromium(VI) |
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