Potassium tetraperoxochromate

Crystal structure
__ Cr 5+      __ K +      __ O -
Crystal system	tetragonal
Space group	I 4 2 m (No. 121)
Lattice parameters	a = 670.3 pm c = 763.2 pm
General
Surname	Potassium tetraperoxochromate
other names	Potassium tetraperoxochromate (V)
Ratio formula	K 3 CrO 8
Brief description	red-brown solid
External identifiers / databases
CAS number 12331-76-9 Wikidata Q10860413
properties
Molar mass	297.3 g mol −1
Physical state	firmly
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Potassium tetraperoxochromate is a chemical compound from the group of chromates .

Extraction and presentation

Potassium tetraperoxochromate can be obtained by reacting potassium hydroxide , chromium (VI) oxide and hydrogen peroxide .

It can also be made by reacting potassium chromate with potassium hydroxide and hydrogen peroxide.

${\displaystyle {\ce {2K2CrO4 + 9H2O2 + 2KOH -> 2K3CrO8 + O2 + 10H2O}}}$

properties

Potassium tetraperoxochromate

Potassium tetraperoxochromate forms deep red-brown octahedral crystals that are moderately soluble in cold water and insoluble in alcohol and ether and explode when heated to 170 ° C. The salt can be kept for a long time without decomposition, but it can explode spontaneously. The crystal structure ( tetragonal , space group I 4 2 m (space group no. 121) ) contains tetraperoxochromate (V) ions, in which each chromium atom is coordinated by eight oxygen atoms.

use

Potassium tetraperoxochromate (V) can be used to generate singlet oxygen . It has also been used to induce arthritis in mice.

Individual evidence

1. ^ R. Stomberg: Least-squares refinement of the crystal structure of potassium peroxochromate . In: Acta Chemica Scandinavica , 1963 , 17 , pp. 1563-1566 doi : 10.3891 / acta.chem.scand.17-1563 .
2. ↑ ^{a b c d} Georg Brauer: Handbook of preparative inorganic chemistry . 3., reworked. Edition. tape III . Enke, Stuttgart 1981, ISBN 3-432-87823-0 , pp. 1528 .
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
4. ↑ J. Derek Woollins: Inorganic Experiments . John Wiley & Sons, 2010, ISBN 978-3-527-32472-9 , pp. 50 ( limited preview in Google Book search).
5. ↑ Jander-Blasius, Textbook of Analytical and Preparative Inorganic Chemistry, 8th Edition, S. Hirzel Verlag Stuttgart, 1969
6. ↑ R. M. Wood, K. A. Abboud, R. & C. Palenik, G. J. Palenik: Bond valence sums in coordination chemistry. Calculation of the oxidation state of chromium in complexes containing only Cr-O bonds and a redetermination of the crystal structure of potassium tetra (peroxo) chromate (V) . In: Inorganic Chemistry , 2000 , 39 , pp. 2065-2068 ( doi : 10.1021 / ic990982c ).
7. ↑ Entry on potassium chromate. In: Römpp Online . Georg Thieme Verlag, accessed on July 10, 2018.
8. ↑ EK Hodgson, I. Fridovich: Production of superoxide radical during the decomposition of potassium peroxochromate (V). In: Biochemistry. 13, 2002, p. 3811, doi : 10.1021 / bi00715a030 .
9. ↑ Ralf Miesel, Hans Kröger, Maciej Kurpisz, Ulrich Weser: Induction of Arthritis in Mice and Rats by Potassium Peroxochromate and Assessment of Disease Activity by Whole Blood Chemiluminescence and pertechnetate-Imaging. In: Free Radical Research. 23, 2009, p. 213, doi : 10.3109 / 10715769509064035 .