Wurster's blue
From Wikipedia, the free encyclopedia
| Wurster's blue | |
|---|---|
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| Other names | N,N,N',N'-Tetramethyl-1,4-phenylendiamin
TMPD |
| Identifiers | |
| CAS number | [100-22-1] |
| PubChem | |
| 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 disclaimer and references |
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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.
