Acid orange 19

Acid orange 19

Names
Other names Sodium 4-hydroxy-3-(2-(4-methyl-3-((phenylamino)sulfonyl)phenyl)diazenyl)-1-naphthalenesulfonate
Identifiers
CAS Number	3058-98-8
3D model (JSmol)	Interactive image
ChemSpider	4675590
ECHA InfoCard	100.019.363
EC Number	221-298-0
PubChem CID	135601373
CompTox Dashboard (EPA)	DTXSID90883728
InChI InChI=1S/C23H19N3O6S2.Na/c1-15-11-12-17(13-21(15)33(28,29)26-16-7-3-2-4-8-16)24-25-20-14-22(34(30,31)32)18-9-5-6-10-19(18)23(20)27;/h2-14,26-27H,1H3,(H,30,31,32);/q;+1/p-1 Key: KKJOSHGDFRDDGD-UHFFFAOYSA-M
SMILES CC1=C(C=C(C=C1)N=NC2=C(C3=CC=CC=C3C(=C2)S(=O)(=O)[O-])O)S(=O)(=O)NC4=CC=CC=C4.[Na+]
Properties
Chemical formula	C23H18N3NaO6S2
Molar mass	519.52 g·mol−1
Hazards
GHS labelling:
Hazard statements	H412
Precautionary statements	P273, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Acid orange 19 is an azo dye that is used to color polyamide and wool fibers. It is usually available as a fine reddish-orange powder. The dye is soluble in water, producing an orange solution. When this solution is treated with concentrated hydrochloric acid, it turns red.

Acid orange 19 is prepared by azo coupling with 1-Hydroxynaphthalene-4-sulfonic acid.

Like most azo dyes, it is mildly toxic when orally ingested and has carcinogenic properties.

References

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