Chrysoine resorcinol

Chrysoine resorcinol
Names


IUPAC name Sodium 4-[(2,4-dihydroxyphenyl)diazenyl]benzenesulfonate
Other names Sodium p-(2,4-dihydroxyphenylazo)benzenesulfonate; Chrysoine; Resorcinol Yellow; Gold Yellow; Yellow T; Tropaeolin O; Tropaeolin R; C.I. Food Yellow 8; C.I. Acid Orange 6; C.I. 14270
Identifiers
CAS Number	547-57-9^Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	21106427^Y
ECHA InfoCard	100.008.114
EC Number	208-924-8
PubChem CID	6093186
UNII	NF91VMI73L^N
InChI InChI=1S/C12H10N2O5S.C6H6O2.Na/c15-9-3-6-11(12(16)7-9)14-13-8-1-4-10(5-2-8)20(17,18)19;7-5-2-1-3-6(8)4-5;/h1-7,15-16H,(H,17,18,19);1-4,7-8H;/q;;+1/p-1/b14-13+;;^Y Key: DJYSHZPRWDNEOL-QDBORUFSSA-M^Y InChI=1/C12H10N2O5S.Na/c15-9-3-6-11(12(16)7-9)14-13-8-1-4-10(5-2-8)20(17,18)19;/h1-7,15-16H,(H,17,18,19);/q;+1/p-1/b14-13+; Key: COEZWFYORILMOM-WTMITFMSBV InChI=1/C12H10N2O5S.C6H6O2.Na/c15-9-3-6-11(12(16)7-9)14-13-8-1-4-10(5-2-8)20(17,18)19;7-5-2-1-3-6(8)4-5;/h1-7,15-16H,(H,17,18,19);1-4,7-8H;/q;;+1/p-1/b14-13+;; Key: DJYSHZPRWDNEOL-MNMGBGISBV
SMILES [Na+].Oc2cc(O)ccc2/N=N/c1ccc(cc1)S([O-])(=O)=O [Na+].Oc2cc(O)ccc2/N=N/c1ccc(cc1)S([O-])(=O)=O.Oc1cccc(O)c1
Properties
Chemical formula	C₁₂H₉N₂NaO₅S
Molar mass	316.26 g·mol⁻¹
Appearance	Orange-yellow solid
Solubility in water	Partially soluble
Hazards
NFPA 704	1 2 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is ^YN ?)
Infobox references

Chrysoine resorcinol is a synthetic azo dye which was formerly used as a food additive. In Europe, it was banned as a food additive in 1977.^[1] In the US, it was banned in 1988.

Chrysoine resorcinol can be used as a pH indicator with a color change between pH 11 and pH 12.7. In colorimetry, it has an absorption maximum of 387 nm.

It can be synthesised via the azo coupling of sulfanilic acid and resorcinol.

Chrysoine resorcinol (pH indicator)
below pH 11.0		above pH 12.7
11.0	⇌	12.7

Notes

↑ http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31976L0399:EN:HTML

External links

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