Manganese violet
From Infogalactic: the planetary knowledge core
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| Names | |
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| Other names
ammonium manganese(III) pyrophosphate
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| Identifiers | |
| 10101-66-3 | |
| Properties | |
| NH4MnP2O7 | |
| Molar mass | 246.885 |
| Appearance | violet solid |
| Vapor pressure | {{{value}}} |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
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.[1]
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]
References
- ↑ 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
- ↑ 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
