Parrot
Structural formula | |||||||||||||||||||
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General | |||||||||||||||||||
Surname | Parrot | ||||||||||||||||||
other names | |||||||||||||||||||
Molecular formula | C 16 H 11 N 3 O 3 | ||||||||||||||||||
Brief description |
red solid |
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properties | |||||||||||||||||||
Molar mass | 293.28 g mol −1 | ||||||||||||||||||
Physical state |
firmly |
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Melting point |
251 ° C |
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solubility |
almost insoluble in water |
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safety instructions | |||||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Parrot is a red azo pigment . It is one of the first azo dyes produced on an industrial scale (1885) and was used to dye wool and cotton. Today it is still used, for example, in colored pencils, but also in cheap printing inks and plastics.
Manufacturing
Parrot can be produced by an azo coupling reaction of diazotized 4-nitroaniline and β-naphthol .
safety instructions
Azo compounds can be broken down reductively when absorbed in the body , releasing aromatic amines that were used in their production. If these starting materials have a carcinogenic effect, this also applies to the azo compounds themselves. However, since azo pigments are practically insoluble, they are not bioavailable and are therefore not toxicologically critical. A possible hazard could arise if the products are contaminated with the starting material through improper manufacture. In the present example this would be 4-nitroaniline, which according to the current state of knowledge does not have any carcinogenic properties.
Individual evidence
- ↑ a b Pararot data sheet at Acros, accessed on February 20, 2010.
- ↑ Entry on Pararot. In: Römpp Online . Georg Thieme Verlag, accessed on December 28, 2014.
- ↑ a b Pararot data sheet from Sigma-Aldrich , accessed on April 18, 2011 ( PDF ).