Appearance violet solid | ||
 | ||
Manganese violet is the inorganic compound called ammonium manganese(III) pyrophosphate. The formula indicates that pyrophosphate (P
2O4−
7), ammonium (NH+
4), and manganese(III) make up this solid. It is prepared by heating a mixture of Mn
2O
3, diammonium phosphate and phosphoric acid. This material is a popular inorganic pigment.
Contents
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.
Spectra
IR-spectra, reflectance and fluorescence spectra can be found at ColourLex.
References
Manganese violet Wikipedia(Text) CC BY-SA