Potassium tetraperoxochromate(V) explained
Potassium peroxochromate, potassium tetraperoxochromate(V), or simply potassium perchromate, is an inorganic compound having the chemical formula . 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.[1] This compound is used as a source of singlet oxygen.[2]
Preparation
Potassium peroxochromate is prepared by treating potassium chromate with hydrogen peroxide at 0 °C:
The intermediate tetraperoxochromate(VI) is reduced by hydrogen peroxide, forming tetraperoxochromate(V):[3] [4]
Thus, the overall reaction is:
The compound decomposes spontaneously at higher temperatures.
Notes and References
- V. S. . Sergienko . Structural chemistry of peroxo compounds of group VI transition metals: I. Peroxo complexes of chromium . Crystallography Reports . 2007 . 639 - 646 . 10.1134/S1063774507040116 . 52 . 4 . 2007CryRp..52..639S . 95018505.
- John W. Peters . Paul J. Bekowies . Arthur M. Winer . James N. Pitts Jr. . Potassium perchromate as a source of singlet oxygen . Journal of the American Chemical Society . 1975 . 97 . 12 . 3299–3306 . 10.1021/ja00845a003 . ACS Publications . English.
- Web site: Preparation, Structure and Vibrational Spectroscopy of Tetraperoxo Complexes of CrV+, VV+, NbV+ and TaV+ . Gentiana . Haxhillazi . 2009-03-07 . https://web.archive.org/web/20110718225714/http://deposit.ddb.de/cgi-bin/dokserv?idn=969592612&dok_var=d1&dok_ext=pdf&fi... . 2011-07-18 . dead.
- E. H. . Riesenfeld . Wohlers, H.E. . Kutsch, W.A. . Höhere Oxydationsproducte des Chroms . Berichte der Deutschen Chemischen Gesellschaft. 1905 . 1885 - 1898 . 10.1002/cber.190503802113 . 38. 2 .
