|Molecular formula||C 19 H 17 N 3|
|External identifiers / databases|
|Molar mass||323.82 g mol −1|
268–270 ° C (decomposition)
10 g l −1 (25 ° C, hydrochloride)
|As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .|
Parafuchsin is a chemical compound . It occurs in the commercially available, red triphenylmethane dye fuchsin , which is dissolved in ethanol and used for staining in microscopy and histology . Parafuchsin and Fuchsin differ in a methyl group and are therefore homologous .
Extraction and presentation
Parafuchsin is created when fuchsin is represented as an impurity. Fuchsine is produced by reacting 4-aminobenzaldehyde , 4-aminobenzyl alcohol or 4,4'-diaminodiphenylmethane with aniline in the presence of oxidizing agents and iron (II) chloride .
The molecule is a mesomeric stabilized cation with the properties of a cyanine dye . This is the reason for the intense color of the commercially available fuchsin (contaminated with parafuchsin). Alcoholic fuchsin solutions have an abnormal dispersion .
The parafuchsin's hydrochloride is mesomeric stabilized, from which an intense color is derived.
- Data sheet pararosaniline (chloride) (PDF) from Merck , accessed on December 30, 2019.
- Entry on 4,4 '- (4-iminocyclohexa-2,5-dienylidenemethylene) dianiline hydrochloride in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on December 30, 2019. Manufacturers or distributors can use the harmonized classification and labeling expand .
- External identifiers or database links for parafuchsin hydrochloride : CAS number: 569-61-9, EC number: 209-321-2, ECHA InfoCard: 100.008.475 , GESTIS substance database : 105310 , PubChem : 11292 , ChemSpider : 10818 , Wikidata : Q27890208 .