Aurin

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.

Aurin (pH indicator)
below pH 5.0 above pH 6.8
5.0 ⇌ 6.8
For the French commune, see Aurin, Haute-Garonne.
Aurin
Names
Preferred IUPAC name
4-[Bis(4-hydroxyphenyl)methylidene]cyclohexa-2,5-dien-1-one
Other names
Aurin, corallin, p-rosolic acid, C.I. 43800
Identifiers
3D model (JSmol)
2055205
ChEMBL
ChemSpider
ECHA InfoCard 100.009.129
EC Number
  • 210-041-8
UNII
  • InChI=1S/C19H14O3/c20-16-7-1-13(2-8-16)19(14-3-9-17(21)10-4-14)15-5-11-18(22)12-6-15/h1-12,20-21H Y
    Key: FYEHYMARPSSOBO-UHFFFAOYSA-N Y
  • InChI=1/C19H14O3/c20-16-7-1-13(2-8-16)19(14-3-9-17(21)10-4-14)15-5-11-18(22)12-6-15/h1-12,20-21H
    Key: FYEHYMARPSSOBO-UHFFFAOYAG
  • C1=CC(=O)C=CC1=C(C2=CC=C(C=C2)O)C3=CC=C(C=C3)O
Properties
C19H14O3
Molar mass 290.318 g·mol−1
Appearance see text
Density 1.283 g/cm3
Melting point 308 °C (586 °F; 581 K) (decomposes)
Insoluble
UV-vis (λmax) 482 nm
-161.4·10−6 cm3/mol
Hazards
GHS labelling:
Danger
H315, H319, H335
P261, P305+P351+P338
NFPA 704 (fire diamond)
1
1
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

Due to this behaviour it can be used as pH indicator with pH transition range 5.0 - 6.8. It is used as an intermediate in manufacturing of dyes.

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