Rosolic acid , Indicator level , 603-45-2

Synonym(s):
4-[Bis(4-hydroxyphenyl)methylene]-2,5-cyclohexadienone;Aurin

CAS NO.：603-45-2

Empirical Formula: C19H14O3

Molecular Weight: 290.31

MDL number: MFCD00001624

EINECS: 210-041-8

PRODUCT Properties

• Melting point: 309°C (decompose)
• Boiling point: 372.4°C (rough estimate)
• Density: 1.2497 (rough estimate)
• refractive index: 1.4200 (estimate)
• storage temp.: Store at room temperature.
• solubility: Practically insoluble in water, benzene; freely soluble in ethanol
• pka: 6.98(at 25℃)
• form: Crystalline Powder
• Colour Index: 43800
• color: Red-brown to brownish-red
• PH Range: 6.8(YELLOW)--8.2(RED)
• Water Solubility: Soluble in alcohol, sodium hydroxide, potassium hydroxide and strong acids. Insoluble in water.
• λmax: 534.6nm, 479.5nm, 482nm
• Merck: 14,881
• BRN: 2055205
• Stability: Stable. Incompatible with strong oxidizing agents.
• Major Application: electrorheological materials, films patterning, antireflective coatings, thermochromic materials, photoresists, film patterning, recording materials, lithium battery, semiconductors, printing materials, inks, corrosion inhibitors, adhesives, drugs, detecting viable cells, treatment of Alzheimer’s disease

Description and Uses

A red coloring medium made from phenol or carbolic acid. It is soluble in alcohol and ether but insoluble in water. When fabrics were steeped in this solution, the color was nonactinic and therefore safe for darkrooms, windows, and doorways. Aurin was also mixed with water-soluble gums and brushed on the backs of collodion and silver bromide gelatin plates as an antihalation layer.

Safety

• Symbol(GHS): GHS07
• Signal word: Warning
• Hazard statements: H315-H319-H335
• Precautionary statements: P261-P280a-P304+P340-P305+P351+P338-P405-P501a-P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313
• Hazard Codes: Xi
• Risk Statements: 36/37/38-36/38
• Safety Statements: 26-36-37/39
• WGK Germany: 3
• TSCA: Yes
• HS Code: 29145090