Manganese violet is the common name for ammonium manganese(III) pyrophosphate, an
inorganic compound
In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemist ...
composed of
ammonium
The ammonium cation is a positively-charged polyatomic ion with the chemical formula or . It is formed by the protonation of ammonia (). Ammonium is also a general name for positively charged or protonated substituted amines and quaternary a ...
(),
manganese in the +3 oxidation state, and the
pyrophosphate anion (). It is prepared by heating a mixture of
manganese(III) oxide
Manganese(III) oxide is a chemical compound with the formula Mn2O3. It occurs in nature as the mineral bixbyite (recently changed to bixbyite-(Mn)IMA 21-H: Redefinition of bixbyite and definition of bixbyite-(Fe) and bixbyite-(Mn). CNMNC Newslette ...
(),
diammonium phosphate, and
phosphoric acid. This material is a popular inorganic
pigment.
[Hugo Müller, Wolfgang Müller, Manfred Wehner, Heike Liewald "Artists' Colors" in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim. ]
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
Nail polish (also known as nail varnish or nail enamel) is a lacquer that can be applied to the human fingernail or toenails to decorate and protect the nail plates. The formula has been revised repeatedly to enhance its decorative properties ...
, and
oil paint.
See also
*
List of inorganic pigments
References
{{reflist
Manganese(III) compounds
Pyrophosphates
Inorganic pigments
Double salts