Misplaced Pages

Potassium tetraperoxochromate(V)

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
(Redirected from Tetraperoxochromate) Chemical compound
Potassium tetraperoxochromate(V)
Names
IUPAC name Potassium tetraperoxochromate(V)
Other names
  • Potassium perchromate
  • Potassium peroxochromate
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Cr.3K.4O2/c;;;;4*1-2/q+5;3*+1;4*-2Key: JSURYJVAXIVWCV-UHFFFAOYSA-N
SMILES
  • .......
Properties
Chemical formula K3[Cr(O2)4]
Molar mass 297.286 g/mol
Appearance black
Melting point 70 °C (158 °F; 343 K) (decomposes)
Solubility in water Poorly soluble (0 °C)
Reacts (45 °C)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

Potassium peroxochromate, potassium tetraperoxochromate(V), or simply potassium perchromate, is an inorganic compound having the chemical formula K3[Cr(O2)4]. It is a red-brown paramagnetic solid. It is the potassium salt of tetraperoxochromate(V), one of the few examples of chromium in the +5 oxidation state and one of the rare examples of a complex stabilized only by peroxide ligands. This compound is used as a source of singlet oxygen.

Preparation

Potassium peroxochromate is prepared by treating potassium chromate with hydrogen peroxide at 0 °C:

2 CrO2−4 + 8 H2O2 → 2 [Cr(O2)4] + 8 H2O

The intermediate tetraperoxochromate(VI) is reduced by hydrogen peroxide, forming tetraperoxochromate(V):

2 [Cr(O2)4] + 2 OH + H2O2 → 2 [Cr(O2)4] + 2 H2O + O2

Thus, the overall reaction is:

2 CrO2−4 + 9 H2O2 + 2 OH → 2 [Cr(O2)4] + 10 H2O + O2

The compound decomposes spontaneously at higher temperatures.

References

  1. ^ John W. Peters; Paul J. Bekowies; Arthur M. Winer; James N. Pitts Jr. (1975). "Potassium perchromate as a source of singlet oxygen". Journal of the American Chemical Society. 97 (12). ACS Publications: 3299–3306. doi:10.1021/ja00845a003.
  2. Sergienko, V. S. (2007). "Structural chemistry of peroxo compounds of group VI transition metals: I. Peroxo complexes of chromium". Crystallography Reports. 52 (4): 639–646. Bibcode:2007CryRp..52..639S. doi:10.1134/S1063774507040116. S2CID 95018505.
  3. Haxhillazi, Gentiana. "Preparation, Structure and Vibrational Spectroscopy of Tetraperoxo Complexes of Cr, V, Nb and Ta". Archived from the original on 2011-07-18. Retrieved 2009-03-07.
  4. Riesenfeld, E. H.; Wohlers, H.E.; Kutsch, W.A. (1905). "Höhere Oxydationsproducte des Chroms". Berichte der Deutschen Chemischen Gesellschaft. 38 (2): 1885–1898. doi:10.1002/cber.190503802113.
Chromium compounds
Chromium(0)
Organochromium(0) compounds
  • Cr(C6H6)2
  • CrC6H6(CO)3
    • Chromium(I)
    Organochromium(I) compounds
    Chromium(II)
    Organochromium(II) compounds
    Chromium(II, III)
    Chromium(III)
    Chromium(IV)
    Chromium(V)
    Chromium(VI)
    Polyatomic ion
    Categories: