Manganese violet
Manganese violet is the common name for ammonium manganese(III) pyrophosphate, an inorganic compound composed of ammonium (NH+
4), manganese in the +3 oxidation state, and the pyrophosphate anion (P
2O4−
7). It is prepared by heating a mixture of manganese(III) oxide (Mn
2O
3), diammonium phosphate, and phosphoric acid. This material is a popular inorganic pigment.[1]
Names | |
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Other names
ammonium manganese(III) pyrophosphate | |
Identifiers | |
3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.030.221 |
EC Number |
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PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
NH4MnP2O7 | |
Molar mass | 246.885 |
Appearance | violet solid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Infobox references | |
Chemical structure
Two polymorphs are known, referred to as the α- and β-forms, but in each case the structures are similar. The Mn(III) centres occupy distorted octahedral sites, being surrounded by six oxygens provided by the pyrophosphate ligands.[2]
Spectra
IR-spectra, reflectance, and fluorescence spectra can be found at ColourLex.[3]
Use
Manganese violet is used in eye liner pencils, eye shadow, lipstick, nail enamel, and oil paint.[4]
See also
References
- Hugo Müller, Wolfgang Müller, Manfred Wehner, Heike Liewald "Artists' Colors" in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim. doi:10.1002/14356007.a03_143.pub2
- Yasmin Begum, Adrian J. Wright "Relating highly distorted Jahn–Teller MnO6 to colouration in manganese violet pigments" J. Mater. Chem., 2012, vol. 22, pp. 21110–21116. doi:10.1039/c2jm33731b
- Manganese violet, at ColourLex
- "Household Products Database - Health and Safety Information on Household Products". hpd.nlm.nih.gov.