Aurin

Aurin
Names


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^Y
3D model (JSmol)	Interactive image
Beilstein Reference	2055205
ChemSpider	4921^Y
ECHA InfoCard	100.009.129
EC Number	210-041-8
PubChem CID	5100
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^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
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	290.32 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 (λ_max)	482 nm
Magnetic susceptibility (χ)	-161.4·10⁻⁶ cm³/mol
Hazards
GHS pictograms
GHS signal word	Danger
GHS hazard statements	H315, H319, H335
GHS precautionary statements	P261, P305+351+338
NFPA 704	1 1 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y (what is ^YN ?)
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.

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.

Aurin is formed by heating of phenol and oxalic acid in concentrated sulfuric acid.

Causes eye, skin, and respiratory tract irritation. Avoid ingestion and/ or inhalation.

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Wikipedia