Chromium(VI) oxide peroxide

From Infogalactic: the planetary knowledge core
Jump to: navigation, search
Chromium(VI) oxide peroxide
CrO5-2D.png
Names
Other names
chromium(VI) oxide peroxide,
chromium pentoxide
Identifiers
35262-77-2 N
Jmol 3D model Interactive image
  • InChI=1/Cr.5O/q;;;-2;2*-1/rCrO4.O/c2-1(3,4)5;/q2*-2
    Key: ZWPVWTIRZYDPKW-NIUFNKCUAY
  • [O-2].[O-][Cr]([O-])(=O)=O
Properties
CrO5
Molar mass 131.99 g·mol−1
soluble (decomposes without stabilisers)
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Chromium(VI) peroxide (CrO5) or chromium oxide peroxide is an unstable compound formed by the addition of acidified hydrogen peroxide solutions to solutions of metal chromates, such as sodium chromate. The generally yellow chromates turn to dark blue-brown as chromium(VI) peroxide is formed. The metal chromate reacts with hydrogen peroxide and an acid to give chromium peroxide, water, and the metal salt of the acid.

M2CrO4 + 2 H2O2 + 2 H+ → CrO5 + 3 H2O + 2 M+

After a few seconds, the chromium(VI) peroxide decomposes to turn green as chromium(III) compounds are formed.[1] To avoid this decomposition, it is possible to stabilize chromium(VI) oxide peroxide in a water-immiscible organic solvent such as diethyl ether, butan-1-ol or amyl acetate by adding a layer of the organic solvent above the chromate/dichromate solution and shaking during the addition of hydrogen peroxide. In this way, the chromium(VI) peroxide (unstable in the aqueous phase in which newly formed) is dissolved in the immiscible organic solvent. In this condition it can be observed over a much longer period.

2 CrO5 + 7 H2O2 + 6 H+ → 2 Cr3+ + 10 H2O + 7 O2

This compound contains one oxo ligand and two peroxo ligands, making a total of five oxygen atoms per chromium atom.

Derivatives

Structure of the complex of CrO5 with pyridine

The etherate, bipyridyl and pyridyl complexes of this compound have been found to be effective oxidants in organic chemistry.[2] The structure of the pyridyl complex has been determined crystallographically.[3]

Gallery

  • An aqueous solution of chromium peroxide

  • A very dilute solution of chromium peroxide

  • chromium(VI) oxide peroxide stabilized in ether phase (above) and chromium(III) aqueous solution (below).

References

<templatestyles src="Reflist/styles.css" />

Cite error: Invalid <references> tag; parameter "group" is allowed only.

Use <references />, or <references group="..." />

External links


<templatestyles src="Asbox/styles.css"></templatestyles>

Stub icon

This inorganic compound–related article is a stub. You can help Wikipedia by expanding it.
  1. ↑ Holleman, Arnold F.; Wiberg, Egon; Wiberg, Nils; (1985). "Chromium" (in German). Lehrbuch der Anorganischen Chemie (91–100 ed.). Walter de Gruyter. pp. 1081–1095. ISBN 3-11-007511-3."
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
Retrieved from "https://infogalactic.com/w/index.php?title=Chromium(VI)_oxide_peroxide&oldid=672554429"