Manganese violet

Manganese violet

Names
Other names ammonium manganese(III) pyrophosphate
Identifiers
CAS Number	10101-66-3
3D model (JSmol)	Interactive image
ChemSpider	141372
EC Number	233-257-4
PubChem CID	160915
UNII	72M48QQV8Q
InChI InChI=1S/Mn.H3N.H4O7P2/c;;1-8(2,3)7-9(4,5)6/h;1H3;(H2,1,2,3)(H2,4,5,6)/q+3;;/p-3 Key: UHHXUPJJDHEMGX-UHFFFAOYSA-K
SMILES [N+H4].[Mn+3].O=P([O-])([O-])OP([O-])([O-])=O
Properties
Chemical formula	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 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.

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.

Use

Manganese violet is used in eye liner pencils, eye shadow, lipstick, nail enamel, and oil paint.

See also

• List of inorganic pigments