Samiksha Jaiswal

Aurin

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Appearance  see text
Molar mass  290.313 g/mol
Melting point  308 °C
Formula  C19H14O3
Density  1.28 g/cm³
Aurin httpsuploadwikimediaorgwikipediacommonsthu

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.

Contents

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.

Synthesis

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

Safety

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

References

Aurin Wikipedia


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