Chromium(II) oxide

Last updated
Chromium(II) oxide
NaCl polyhedra.png
Names
IUPAC name
chromium(II) oxide
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/Cr.O
    Key: XVOFZWCCFLVFRR-UHFFFAOYSA-N
  • O=[Cr]
Properties
CrO
Molar mass 67.996 g/mol
Appearanceblack
Melting point 300 °C (572 °F; 573 K) (decomposes)
Structure
cubic, cF8
Fm3m, No. 225
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
X mark.svgN  verify  (what is  Yes check.svgYX mark.svgN ?)

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]

Contents

Properties

It is readily oxidized by the atmosphere. CrO is basic, while CrO3 is acidic, and Cr2O3 is amphoteric. [3]

Occurrence

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]

Preparation

Hypophosphites such as hypophosphorous acid can reduce chromium(III) oxide to chromium(II) oxide:

H3PO2 + 2 Cr2O3 → 4 CrO + H3PO4

References

  1. ↑ Satish. Anand, Raj. Kumar (1989), Dictionary of Inorganic Chemistry, Anmol Publications, ISBN   978-81-7041-236-6
  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. arXiv: 1504.03421 . Bibcode:2015A&A...580A..34K. doi:10.1051/0004-6361/201526212. S2CID   118566357.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.