Chrysoine resorcinol
Appearance
(Redirected from Tropaeolin O)
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Names | |
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IUPAC name
Sodium 4-[(2,4-dihydroxyphenyl)diazenyl]benzenesulfonate
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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
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.008.114 |
EC Number |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C12H9N2NaO5S | |
Molar mass | 316.26 g·mol−1 |
Appearance | Orange-yellow solid |
Partially soluble | |
Hazards | |
NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chrysoine resorcinol is a synthetic azo dye which was formerly used as a food additive.[citation needed] In Europe, it was banned as a food additive in 1977.[1] In the US, it was banned in 1988.[2]
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 |
Preparation
[edit]Acid orange 6 can be synthesised via the azo coupling of sulfanilic acid and resorcinol,
Notes
[edit]- ^ "EUR-Lex - Official Journal of the European Union".
- ^ "Chrysoine Resorcinol Properties, Molecular Formula, Applications - WorldOfChemicals". www.worldofchemicals.com. Retrieved 2022-07-12.
External links
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