Difference between revisions of "Wurster's blue"
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Latest revision as of 12:11, 20 September 2010
| Wurster's blue | |
|---|---|
| File:Tetramethylphenylendiamine.png | |
| Other names N,N,N',N'-Tetramethyl-1,4-phenylendiamin
TMPD | |
| style="background: #F8EABA; text-align: center;" colspan="2" | Identifiers | |
| CAS number | 100-22-1 |
| PubChem | 7490 |
| style="background: #F8EABA; text-align: center;" colspan="2" | Properties | |
| Molecular formula | C6H8N2 |
| Molar mass | 164.25 g/mol |
| Appearance | Colourless crystalline solid |
| Melting point |
51 °C, 324 K, 124 °F |
| Boiling point |
260 °C, 533 K, 500 °F |
| Acidity (pKa) | 6.35 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
| Infobox references | |
Wurster's blue is the trivial name given to the chemical N,N,N′,N′-tetramethyl-p-phenylenediamine, also known as TMPD. It is an easily oxidised phenylenediamine, which loses two electrons in one-electron oxidation steps; the radical cation is a characteristic blue-violet colour, which gives the compound part of its name. The remaining part of its name comes from its discoverer, the German chemist Casimir Wurster (August 7 1854 - 29 November 1913).
It finds use as a redox indicator in the oxidase test and is also used in electron transport chain analysis; it is capable of donating electrons to cytochrome C.
