Parafuchsin
Structural formula | |||||||||||||||||||
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General | |||||||||||||||||||
Surname | Parafuchsin | ||||||||||||||||||
other names |
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Molecular formula | C 19 H 17 N 3 | ||||||||||||||||||
Brief description |
greenish solid |
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External identifiers / databases | |||||||||||||||||||
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properties | |||||||||||||||||||
Molar mass | 323.82 g mol −1 | ||||||||||||||||||
Physical state |
firmly |
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Melting point |
268–270 ° C (decomposition) |
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solubility |
10 g l −1 (25 ° C, hydrochloride) |
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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 . |
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 .
properties
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.
Web links
Individual evidence
- ↑ a b c Data sheet pararosaniline (chloride) (PDF) from Merck , accessed on December 30, 2019.
- ↑ a b Entry on parafuchsin in the GESTIS substance database of the IFA , accessed on December 30, 2019(JavaScript required) .
- ↑ 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 .