Aurin
From Wikipedia, the free encyclopedia
| Aurin | |
|---|---|
 |
|
| IUPAC name | 4-[bis(p-hydroxyphenyl)methylene]- -2,5-cyclohexadien-1-one |
| Other names | Aurin, corallin, p-rosolic acid, C.I. 43800 |
| Identifiers | |
| CAS number | [603-45-2] |
| EINECS number | |
| Properties | |
| Molecular formula | c19H14O3 |
| Molar mass | 290.32 g/mol |
| Melting point |
308 °C (decomp.) |
| Solubility in water | insoluble |
| Hazards | |
| NFPA 704 |
 0
1
0
|
| R-phrases | R36 R37 R38 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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- For the French commune, see Aurin, Haute-Garonne.
- For the Aragonese village, see Aurin, Sabiñánigo, Huesca, España.
Aurin (C.I. 43800), sometimes named rosolic acid or corallin is an organic compound, forming yellowish or deep-red crystals with greenish metallic luster. It is practically insoluble in water, freely soluble in alcohol. It is soluble in strong acids to form yellow solution, or in aqueous alkalis to form carmine red solutions. Due to this behaviour it can be used as pH indicator with pH transition range 5.0 - 6.8. It used as intermediate in manufacturing of dyes.
