Pararosaniline

Pararosaniline
IUPAC name [4-[Bis(4-aminophenyl)methylidene]-1-cyclohexa-2,5-dienylidene]azanium chloride
Other names Pararosaniline hydrochloride Pararosaniline chloride C.I. 42500 C.I. Basic Red 9, monohydrochloride Para magenta
Identifiers
CAS number	569-61-9
PubChem	11292
UNII	20N4C0M8NM Y
KEGG	C19210 Y
Jmol-3D images	Image 1
SMILES C1=CC(=[NH2+])C=CC1=C(C2=CC=C(C=C2)N)C3=CC=C(C=C3)N.[Cl-]
Properties
Molecular formula	C19H18ClN3
Molar mass	323.82 g/mol
Appearance	Green crystalline solid
Melting point	268-270°C (541-543 K) dec.
Solubility in water	Slightly soluble
Hazards
MSDS	External MSDS
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Pararosaniline, Basic Red 9, or C.I. 42500 is a magenta dye having chemical formula C₁₉H₁₈N₃Cl. It is one of the four components of basic fuchsine. (The others are rosaniline, new fuchsine and magenta II.) Pararosaniline, which is sold as a single dye, may make the best Schiff's reagent. It is the only basic fuchsine component suitable for making the aldehyde-fuchsine stain for pancreatic islet beta cells

Further reading

• Colour Index 3rd Edition Volume 4, Bradford: Society of Dyers and Colourists, 1971, pp. 4388, http://www.colour-index.org/help/3121_Triarylmethane.pdf .
• Gessner, T.; Mayer, U. (2002), "Triarylmethane and Diarylmethane Dyes", Ullmann's Encyclopedia of Industrial Chemistry 6th Edition, Weinheim: Wiley-VCH, doi:10.1002/14356007.a27_179 .