Potassium tetraperoxochromate(V): Difference between revisions
Appearance
Content deleted Content added
added picture |
Bernardirfan (talk | contribs) Missing links |
||
(38 intermediate revisions by 29 users not shown) | |||
Line 1: | Line 1: | ||
{{short description|Chemical compound}} |
|||
{{Chembox |
{{Chembox |
||
| verifiedrevid = |
| verifiedrevid = 431908114 |
||
| ImageFile = Potassium tetraperoxochrom.jpg |
| ImageFile = Potassium tetraperoxochrom.jpg |
||
| ImageSize = |
| ImageSize = |
||
| IUPACName = |
| IUPACName = Potassium tetraperoxochromate(V) |
||
| OtherNames = |
| OtherNames = {{ubl|Potassium perchromate|Potassium peroxochromate}} |
||
| |
|Section1={{Chembox Identifiers |
||
| |
| ChemSpiderID = 106513 |
||
| PubChem = 139134081 |
|||
⚫ | |||
| CASNo_Ref = {{cascite|correct|??}} |
|||
| SMILES = }} |
|||
⚫ | |||
⚫ | |||
| 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] |
|||
}} |
|||
⚫ | |||
⚫ | |||
⚫ | |||
| Appearance = red brown |
| Appearance = red brown |
||
| Density = |
| Density = |
||
| |
| MeltingPtC = 70 |
||
| MeltingPt_notes= (decomposes) |
|||
| MeltingPt_ref = <ref name="1oxy" /> |
|||
| BoilingPt = |
| BoilingPt = |
||
| Solubility = }} |
| Solubility = Poorly soluble (0 °C)<br />Reacts (45 °C)<ref name="1oxy" /> }} |
||
| |
|Section7={{Chembox Hazards |
||
| MainHazards = |
| MainHazards = |
||
| FlashPt = |
| FlashPt = |
||
| |
| AutoignitionPt = }} |
||
}} |
|||
}}<!-- Text starts below--> |
|||
'''Potassium peroxochromate''', |
'''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 = 639–646 | 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> |
||
==Preparation== |
==Preparation== |
||
Potassium peroxochromate is prepared by |
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<sup>V+</sup>, V<sup>V+</sup>, Nb<sup>V+</sup> and Ta<sup>V+</sup> | 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 = 1885–1898 | doi = 10.1002/cber.190503802113 | volume = 38| issue = 2 | url = https://zenodo.org/record/1426142}} |
||
: 2 {{chem|CrO|4|2-}} + 8 {{chem|H|2|O|2}} → 2 {{chem|[Cr(O|2|)|4|]|2-}} + 8 {{chem|H|2|O}} |
|||
⚫ | 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<sup>V+</sup>, V<sup>V+</sup>, Nb<sup>V+</sup> and Ta<sup>V+</sup> | first = Gentiana | last = Haxhillazi}}</ref><ref>{{cite journal |
||
</ref> |
</ref> |
||
: |
:{{chem2|2 [Cr(O2)4](2-) + 2 OH- + H2O2 → 2 [Cr(O2)4](3-) + 2 H2O + O2}} |
||
Thus, the overall reaction is: |
Thus, the overall reaction is: |
||
:{{chem2|2 CrO4(2-) + 9 H2O2 + 2 OH- → 2 [Cr(O2)4](3-) + 10 H2O + O2}} |
|||
:2 {{chem|CrO|4|2-}} + 9 {{chem|H|2|O|2}} + 2 {{chem|OH|-}} → 2 {{chem|[Cr(O|2|)|4|]|3-}} + 10 {{chem|H|2|O}} + {{chem|O|2}} |
|||
The compound decomposes spontaneously at higher temperatures. |
The compound decomposes spontaneously at higher temperatures. |
||
==References== |
==References== |
||
{{Reflist}} |
{{Reflist}} |
||
{{Chromium compounds}} |
|||
[[Category:Potassium compounds]] |
[[Category:Potassium compounds]] |
||
[[Category: |
[[Category:Chromium–oxygen compounds]] |
||
[[Category:Oxidizing agents]] |
[[Category:Oxidizing agents]] |
||
[[Category:Peroxides]] |
|||
[[Category:Chromium(V) compounds]] |
|||
{{inorganic-compound-stub}} |