Fuchsine
- Magenta
- Diamantfuchsin
- Magenta I
- Magenta
- Basic Violet 14 (INCI; KVO)
- CI 42510 (INCI)
- Rosaniline chloride
- Methylrosaniliniumchlorid
- Methylfuchsin
- 3- Methylparafuchsin
Green solid
- 302.39 g.mol -1 ( base)
- 337.85 g.mol -1 (hydrochloride)
Fixed
235 ° C ( decomposition)
Little in water ( 4 g · l-1 at 25 ° C)
Risk
Template: Infobox chemical / molecular formula search available
Fuchsine is a red-blue triphenylmethane dye, is dissolved in alcohol (ethanol ) is used in microscopy and histology of the dyeing.
History
Fuchsin was discovered in 1858 by the German chemist August Wilhelm von Hofmann and almost at the same time of the Lyon chemist François -Emmanuel Verguin and named after the American ornamental plant Fuchsia, whose blue red flowers have a similar hue. It was the second large- engineered coal tar dye.
Representation
Fuchsine is prepared by reaction of 4- aminobenzaldehyde, 4 - aminobenzyl alcohol or 4,4 '-diaminodiphenylmethane with an aniline in the presence of oxidizing agents, and iron ( II) chloride. This creates except the fuchsin as an impurity also parafuchsine, which has similar properties.
Properties
Fuchsin is green yellow crystals with metallic luster, which dissolve in water and alcohol slowly with intense red color.
Commercial Fuchsin is a mixture of fuchsin itself - IUPAC Name: 4 - [ (4,4 ' -diamino ) diphenylmethylene ] cyclohexa -2,5- dienylidenammoniumchlorid - and parafuchsine {4 - [( 4,4' -diamino ) diphenylmethylene ] -2- methylcyclohexa -2 ,5- dienylidenammoniumchlorid }. They differ in a methyl group and are thus homologous.
The molecule represents a resonance-stabilized cations, with the characteristics of a cyanine dye. This explains the intense color of the fuchsin. Alcoholic fuchsin solutions possess an anomalous dispersion.
Use
- Fuchsin has long been used as a coloring agent for wool and leather.
- It is used in the Feulgenschen Nuclealreaktion to detect DNA in cell nuclei or core equivalent of bacteria. It can also be used for chromosome staining.
- Fuchsin antifungal and antiseptic effect in Gram-positive bacteria, but is still used on suspicion of carcinogenicity in humans neither in veterinary medicine.
- 1895 fuchsin was first described as a trigger for bladder cancer.
- Basic fuchsin is used since the 1960s in order to color in bone microcracks in vitro and to identify with the fluorescence of the dye.
- Due to the existing open porosity in stoneware that can be proven by the " Fuchsintest ", can be a clear distinction to china make out.
- As fuchsin acid, it is used as evidence for aldehydes. It is to the magenta solution of fuchsin sulfurous acid slightly diluted added until the liquid is discolored. When adding to an aldehyde, the solution turns to blue and red to purple.