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Aurin information


For the French commune, see Aurin, Haute-Garonne.
Aurin
Skeletal formula of aurin
Ball-and-stick model
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
CAS Number
  • 603-45-2 checkY
3D model (JSmol)
  • Interactive image
Beilstein Reference
 2055205
ChEMBL
  • ChEMBL210868 checkY
ChemSpider
  • 4921 checkY
ECHA InfoCard 100.009.129 Edit this at Wikidata
EC Number
  • 210-041-8
PubChem CID
  • 5100
UNII
  • 85N4AK3JAU checkY
CompTox Dashboard (EPA)
  • DTXSID2022387 Edit this at Wikidata
InChI
  • 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 checkY
    Key: FYEHYMARPSSOBO-UHFFFAOYSA-N checkY
  • 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
SMILES
  • C1=CC(=O)C=CC1=C(C2=CC=C(C=C2)O)C3=CC=C(C=C3)O
Properties
Chemical formula
 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)
Solubility in water
 Insoluble
UV-vis (λmax) 482 nm[1]
Magnetic susceptibility (χ)
 -161.4·10−6 cm3/mol
Hazards
GHS labelling:
Pictograms
 GHS07: Exclamation mark[1]
Signal word
 Danger
Hazard statements
 H315, H319, H335[1]
Precautionary statements
 P261, P305+P351+P338[1]
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
1
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)
Infobox references

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

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.

  1. ^ a b c d Sigma-Aldrich Co., p-Rosolic acid. Retrieved on 2014-05-06.

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