Magnesium chromate
{{Chembox
| ImageFile = Magnesium chromate formula.svg
| OtherNames = Magnesium chromate(VI)
Magnesium monochromate
Magnesium monochromate(VI)
| Section1 = {{Chembox Identifiers
| CASNo = 13423-61-5
| PubChem = 61599
| ChemSpiderID = 55507
| SMILES = [O-][Cr](=O)(=O)[O-].[Mg+2]
| InChI = 1/Cr.Mg.4O/q;+2;;;2*-1/rCrO4.Mg/c2-1(3,4)5;/q-2;+2
| InChIKey = CRGGPIWCSGOBDN-OVNOGNLDAB
| StdInChI = 1S/Cr.Mg.4O/q;+2;;;2*-1
| StdInChIKey = CRGGPIWCSGOBDN-UHFFFAOYSA-N}}
| Section2 = {{Chembox Properties
| Mg=1|Cr=1|O=4
| Formula = {{chem2|MgCrO4}}
| Appearance = Yellow solid
| Solubility = soluble}}
| Section3 = {{Chembox Hazards}}}}
Magnesium chromate is a chemical compound, with the formula {{chem2|MgCrO4}}. It is a yellow, odorless, water-soluble salt with several important industrial uses. This chromate can be manufactured as a powder.
History
Before 1940, the literature about magnesium chromate and its hydrates was sparse, but studies starting in that year looked at its properties and solubility.{{cite journal|doi=10.1021/ja01865a059|year=1940|last1=Hill|first1=Arthur E.|title=The Systems Magnesium Chromate—Water and Ammonium Chromate—Water from 0 to 75 °C|last2=Soth|first2=Glenn C.|last3=Ricci|first3=John E.|journal=Journal of the American Chemical Society|volume=62|issue=8|page=2131}}
Uses
It is available commercially in a variety of powders, from nanoscale to micron-sized, either as an anhydrous or hydrated form.{{Cite web|url=http://www.americanelements.com/mgcrat.html|title=Magnesium Chromate|work=American Elements|accessdate=2013-07-16|archive-date=2013-07-22|archive-url=https://web.archive.org/web/20130722070134/http://www.americanelements.com/mgcrat.html|url-status=dead}}{{cite journal|doi=10.4028/www.scientific.net/AMR.284-286.730|title=Synthesis of Nano-Crystalline Magnesium Chromate Spinel by Citrate Sol-Gel Method|year=2011|last1=Li|first1=Su Ping|last2=Jia|first2=Xiao Lin|last3=Qi|first3=Ya Fang|journal=Advanced Materials Research|volume=284-286|page=730|s2cid=137408833}}
As a hydrate, it is useful as a corrosion inhibitor and pigment,{{cite web|url=https://us.vwr.com/store/catalog/product.jsp?product_id=9880222 |title=Magnesium chromate hydrate, 99.8% (metals basis) |publisher=Us.vwr.com |date= |accessdate=2013-07-16}} or as an ingredient in cosmetics.{{cite web|url=http://metal-powders-compounds.micronmetals.com/item/high-purity-metal-powders-compounds/magnesium-chromate/mg-401 |title=Item # MG-401, Heavy Magnesium Chromate Powder On Atlantic Equipment Engineers, A Division Of Micron Metals, Inc |publisher=Metal-powders-compounds.micronmetals.com |date= |accessdate=2013-07-16}}
In 2011, an undecahydrate (containing 11 molecules of water) of this compound was discovered by scientists at the University College London.{{cite journal|last1=Fortes|first1=A. Dominic |last2=Wood|first2=Ian G.|title=X-ray powder diffraction analysis of a new magnesium chromate hydrate, MgCrO4·11H2O|doi=10.1017/S088571561200005X|volume=27|issue=1|date=March 2012|pages=8–11|journal=Powder Diffraction|bibcode=2012PDiff..27....8F |s2cid=101802113}}
Hazards
Magnesium chromate hydrate should be stored at room temperature, and there is no current therapeutic use.{{cite web|url=https://www.scbt.com/scbt/product/magnesium-chromate-hydrate-23371-94-0 |title=Magnesium chromate hydrate | CAS 23371-94-0 | Santa Cruz Biotech|publisher = Santa Cruz Biotechnology, Inc.|date= |accessdate=2013-07-16}} It is a confirmed carcinogen, and can cause acute dermititis, and possibly kidney and liver damage if inhaled, so it should be treated as a hazardous waste.{{Cite web|url=http://www.mcgean.com/documents/msds/usa-all/MS35500.pdf|title=Material Data Sheet|work=McGean-Rohco, Inc.|accessdate=2013-07-16|archive-date=2013-07-09|archive-url=https://web.archive.org/web/20130709201448/http://www.mcgean.com/documents/msds/usa-all/ms35500.pdf|url-status=dead}}
References
{{reflist}}
{{Magnesium compounds}}
{{Chromates and dichromates}}