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| | ROSOLIC ACID Basic information |
| | ROSOLIC ACID Chemical 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 | | CAS DataBase Reference | 603-45-2 | | EPA Substance Registry System | 2,5-Cyclohexadien-1-one, 4-[bis(4-hydroxyphenyl)methylene]- (603-45-2) |
| | ROSOLIC ACID Usage And Synthesis |
| Chemical Properties | red crystals or powder | | Uses | activates heme oxygenase, anti-oxidative stress, inhibits DNA fragmentation | | 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. | | Uses | Rosolic acid is used as a pH indicator in the range from 5.0 to 6.8. It acts as an intermediate in the manufacturing dyes. It is involved in the activation of heme oxygenase and in the inhibition of DNA fragmentation. It finds application in the selective isolation of coliform bacteria. | | Definition | ChEBI: Aurin is a diarylmethane. | | Purification Methods | It forms green crystals with a metallic luster, but the colour depends on the solvent used. When recrystallised from brine (saturated aqueous NaCl) acidified with HCl, it forms red needles, but when recrystallised from EtO/AcOH, the crystals have a beetle iridescent green colour. It has been recrystallised from Me2CO (although it dissolves slowly), methyl ethyl ketone, 80-95% AcOH and from AcOH/*C6H6. An aqueous KOH solution is golden yellow, and a 70% H2SO4 solution is deep red in colour. An alternative purification is to dissolve this triphenylmethane dye in 1.5% of aqueous NH3, filter, and heat to 70-80o, then acidify with dilute AcOH by adding it slowly with vigorous stirring, whereby the aurin separates as a brick-red powder or as purplish crystals depending on the temperature and period of heating. Filter off the solid, wash it with H2O and a little dilute AcOH, then H2O again. Stir this solid with Et2O to remove any ketones and allow it to stand overnight in the Et2O, then filter and dry it in air then in a vacuum. [Gomberg & Snow J Am Chem Soc 47 202 1925, Baines & Driver J Chem Soc 123 1216 1923, UV: Burawoy Chem Ber 64 462 1941, Beilstein 8 IV 2646.] |
| | ROSOLIC ACID Preparation Products And Raw materials |
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