Manganese violet

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Manganese violet
Manganese violet.jpg
Names
Other names
ammonium manganese(III) pyrophosphate
Identifiers
ECHA InfoCard 100.030.221
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

Manganese violet is the inorganic compound called ammonium manganese(III) pyrophosphate. The formula indicates that pyrophosphate (P
2
O4−
7
), ammonium (NH+
4
), and manganese(III) make up this solid. It is prepared by heating a mixture of Mn
2
O
3
, diammonium phosphate and phosphoric acid. This material is a popular inorganic pigment.[1]

Chemical structure[edit]

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[edit]

IR-spectra, reflectance and fluorescence spectra can be found at ColourLex.[3]

See also[edit]

References[edit]

  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