Chrysoine resorcinol is a synthetic azo dye which was formerly used as a food additive .[ citation needed ] [ 1] [ 2]
Quick Facts Names, Identifiers ...
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
ChemSpider
ECHA InfoCard 100.008.114
EC Number
UNII
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
[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
C 12 H 9 N 2 Na O 5 S
Molar mass g·mol−1
Appearance
Orange-yellow solid
Partially soluble
Hazards
NFPA 704 diamond)
Except where otherwise noted, data are given for materials in their
standard state (at 25
°C [77
°F], 100
kPa).
Close
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 .
Chrysoine resorcinol (pH indicator )
below pH 11.0 above pH 12.7
11.0 ⇌ 12.7
