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]

Manganese violet
Names
Other names
ammonium manganese(III) pyrophosphate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.221
EC Number
  • 233-257-4
UNII
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]

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See also

References
  1. 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
  2. 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
  3. Manganese violet, at ColourLex
  4. "Household Products Database - Health and Safety Information on Household Products". hpd.nlm.nih.gov.
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