Potassium tetraperoxochromate(V): Difference between revisions

{{short description|Chemical compound}}

| verifiedrevid = 431908114

| IUPACName = Potassium tetraperoxochromate(V)

| OtherNames = {{ubl|Potassium perchromate|Potassium peroxochromate}}

|Section1={{Chembox Identifiers

| ChemSpiderID = 106513

| PubChem = 139134081

| CASNo_Ref = {{cascite|correct|??}}

| CASNo = 12331-76-9

| StdInChI=1S/Cr.3K.4O2/c;;;;4*1-2/q+5;3*+1;4*-2

| StdInChIKey = JSURYJVAXIVWCV-UHFFFAOYSA-N

| SMILES = [O-][O-].[O-][O-].[O-][O-].[O-][O-].[K+].[K+].[K+].[Cr+5]

}}

|Section2={{Chembox Properties

| Formula = {{chem2|K3[Cr(O2)4]}}

| MolarMass = 297.286 g/mol

| MeltingPtC = 70

| MeltingPt_notes= (decomposes)

| MeltingPt_ref = <ref name="1oxy" />

| Solubility = Poorly soluble (0 °C)<br />Reacts (45 °C)<ref name="1oxy" /> }}

|Section7={{Chembox Hazards

| AutoignitionPt = }}

}}

'''Potassium peroxochromate''', '''potassium tetraperoxochromate(V)''', or simply '''potassium perchromate''', is an [[inorganic compound]] having the [[chemical formula]] {{chem2|K3[Cr(O2)4]|auto=1}}. 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.<ref>{{cite journal | first = V. S. | last = Sergienko | title = Structural chemistry of peroxo compounds of group VI transition metals: I. Peroxo complexes of chromium | journal = Crystallography Reports | year = 2007 | pages = 639&ndash;646 | doi = 10.1134/S1063774507040116 | volume = 52 | issue = 4 |bibcode = 2007CryRp..52..639S | s2cid = 95018505}}</ref> This compound is used as a source of [[singlet oxygen]].<ref name="1oxy">{{cite journal |author1=John W. Peters |author2=Paul J. Bekowies |author3=Arthur M. Winer |author4=James N. Pitts Jr. |title=Potassium perchromate as a source of singlet oxygen |journal=Journal of the American Chemical Society |date=1975 |volume=97 |issue=12 |pages=3299–3306 |doi=10.1021/ja00845a003 |publisher=ACS Publications |language=English}}</ref>

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

:{{chem2|2 CrO4(2-) + 8 H2O2 → 2 [Cr(O2)4](2-) + 8 H2O}}

The intermediate tetraperoxochromate(VI) is reduced by hydrogen peroxide, forming tetraperoxochromate(V):<ref>{{cite web | url = http://deposit.ddb.de/cgi-bin/dokserv?idn=969592612&dok_var=d1&dok_ext=pdf&fi... | title = Preparation, Structure and Vibrational Spectroscopy of Tetraperoxo Complexes of Cr^V+, V^V+, Nb^V+ and Ta^V+ | first = Gentiana | last = Haxhillazi | access-date = 2009-03-07 | archive-url = https://web.archive.org/web/20110718225714/http://deposit.ddb.de/cgi-bin/dokserv?idn=969592612&dok_var=d1&dok_ext=pdf&fi... | archive-date = 2011-07-18 | url-status = dead}}</ref><ref>{{cite journal | first = E. H. | last = Riesenfeld |author2=Wohlers, H.E. |author3=Kutsch, W.A. | title = Höhere Oxydationsproducte des Chroms | journal = Berichte der Deutschen Chemischen Gesellschaft| year = 1905 | pages = 1885&ndash;1898 | doi = 10.1002/cber.190503802113 | volume = 38| issue = 2 | url = https://zenodo.org/record/1426142}}

:{{chem2|2 [Cr(O2)4](2-) + 2 OH- + H2O2 → 2 [Cr(O2)4](3-) + 2 H2O + O2}}

:{{chem2|2 CrO4(2-) + 9 H2O2 + 2 OH- → 2 [Cr(O2)4](3-) + 10 H2O + O2}}

{{Chromium compounds}}

[[Category:Chromium–oxygen compounds]]

[[Category:Peroxides]]

[[Category:Chromium(V) compounds]]