Chromium(Ii) Oxide

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Chromium(II) oxide
NaCl polyhedra.png
Names
IUPAC name
chromium(II) oxide
Identifiers
CAS Number
  • 12018-00-7 ☑Y
PubChem CID
  • 3037052
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 [77 °F], 100 kPa).
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Infobox references

Chromium(II) oxide (CrO) is an inorganic compound composed of chromium and oxygen.[1] It is a black powder that crystallises in the rock salt structure.[2] 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 CrO
3 is acidic, and Cr
2O
3 is amphoteric.[3]

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.[4]

See also

  • Chromium(IV) oxide
  • Chromium(VI) oxide

References

  1. ↑ Satish. Anand, Raj. Kumar (1989), Dictionary of Inorganic Chemistry, Anmol Publications, ISBN 978-81-7041-236-6, https://books.google.com/books?id=6yDA6nb5KCUC&dq="Chromium(II)+oxide"&pg=PA65 
  2. ↑ Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN:0-12-352651-5
  3. ↑ Chemistry 7th edition, by Raymond Chang page 645 (problem 15.100)
  4. ↑ 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. doi:10.1051/0004-6361/201526212. Bibcode: 2015A&A...580A..34K. 



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Categories: [Chromium(II) compounds] [Transition metal oxides] [Reducing agents] [Chromium–oxygen compounds] [Rock salt crystal structure]

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