Pyrocatecholsulfonephthalein
Pyrocatechol Violet
CAS: 115-41-3
Molecular Formula: C19H14O7S
Pyrocatecholsulfonephthalein - Names and Identifiers
Pyrocatecholsulfonephthalein - Physico-chemical Properties
| Molecular Formula | C19H14O7S |
| Molar Mass | 386.38 |
| Density | 1.632±0.06 g/cm3(Predicted) |
| Melting Point | 185°C (dec.)(lit.) |
| Boling Point | 659.5±55.0 °C(Predicted) |
| Water Solubility | Soluble in water, ethylene glycol, monomethyl ether and ethanol. |
| Solubility | Soluble in water (60 mg/ml), ethylene glycol monomethyl ether (60 mg/ml), and ethanol ( |
| Appearance | Powder |
| Color | Dark red-brown |
| BRN | 353938 |
| pKa | 7.21±0.10(Predicted) |
| Storage Condition | -20°C Freezer, Under inert atmosphere |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Sensitive | Easily absorbing moisture |
| Refractive Index | 1.737 |
| MDL | MFCD00005868 |
| Physical and Chemical Properties | Red-brown crystalline powder. Soluble in water and water-containing alcohol, slightly soluble in cold ethanol, insoluble in non-polar organic solvents) (such as ether, benzene, xylene). The aqueous solution is yellow, when the acidity increases, it changes from yellow to red, more than pH 6 to cyan purple, and more than pH 9 to purple red. The aqueous solution is stable, but is susceptible to oxidation by oxidants. |
| Use | Used as an indicator for metal complexation titration. |
Pyrocatecholsulfonephthalein - Risk and Safety
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | 24/25 - Avoid contact with skin and eyes. |
| WGK Germany | 3 |
| TSCA | Yes |
| HS Code | 32041900 |
Pyrocatecholsulfonephthalein - Reference
| Reference Show more | 1. Wang Lu, Gao Yugang, Guo Yang, et al. Antioxidant and anti-melanoma effects of culture solution homogenate ginseng hair root [J]. Food Science, 2018, 039(017):152-158. 2. [IF = 7.46] Rui Liu et al."Visual classification for sesame oil adulteration detection and quantification of compounds used as adulterants using flavor compounds targeted array sensor in combination with DD-SIMCA and PLS." Sensor Actuat B- Chem. 2022 Apr;357:131335 |
Pyrocatecholsulfonephthalein - Introduction
Easily soluble in water and aqueous ethanol, slightly soluble in cold absolute ethanol. Insoluble in non-polar solvents (such as ether, benzene, xylene), its aqueous solution is yellow, when the acidity increases, it turns from yellow to red, its aqueous solution is yellow at pH 1-5~7, pH 7~9 is purple, pH 9~11 is reddish purple. The aqueous solution is yellow and stable, but it is easily oxidized by oxidants.
Last Update：2022-10-16 17:12:21
Pyrocatecholsulfonephthalein - Reference Information
| pH indicator color change ph range | 6.0(YELLOW)-7.0(PURPLE)-9.0(PURPLISH RED) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | as a complexometric titration indicator. Biochemical research Used as an indicator for metal complexation titration. |
| Production method | It is obtained by the reaction of phthaloylsulfonimide and catechol. |
Last Update：2024-04-09 21:21:28
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