1,2-Benzenediol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis-
Pyrocatechol Violet
CAS: 115-41-3
Molecular Formula: C19H14O7S
1,2-Benzenediol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis- - Names and Identifiers
| Name | Pyrocatechol Violet |
| Synonyms | Catechol Violet Pyrocatechol Violet PyrocatecholVioletGr Catecholsulfonphthalein catecholsulphonephthalein Pyrocatecholsulfonephthalein Pyrocatechol sulphonephthalein Pyrocatechimsulfonphthalein violed PYROCATECHOL VIOLET, FOR COLORIMETRY PYROCATECHOL VIOLET, INDICATOR GRADE Pyrocatechol Violet, indicator grade, pure PYROCATECHOL VIOLET INDICATOR FOR METAL TITRATION alpha,alpha-bis(3,4-dihydroxyphenyl)toluene-2,alpha-sultone 4,4'-(1,1-dioxido-3H-2,1-benzoxathiole-3,3-diyl)dibenzene-1,2-diol 1,2-Benzenediol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis- 2-[(E)-(3,4-dihydroxyphenyl)(3-hydroxy-4-oxocyclohexa-2,5-dien-1-ylidene)methyl]benzenesulfonic acid 2-[(Z)-(3,4-dihydroxyphenyl)(3-hydroxy-4-oxocyclohexa-2,5-dien-1-ylidene)methyl]benzenesulfonic acid |
| CAS | 115-41-3 |
| EINECS | 204-088-3 |
| InChI | InChI=1/C19H14O7S/c20-14-7-5-11(9-16(14)22)19(12-6-8-15(21)17(23)10-12)13-3-1-2-4-18(13)27(24,25)26/h1-10,20,22-23H,(H,24,25,26)/b19-12- |
1,2-Benzenediol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis- - 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. |
1,2-Benzenediol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis- - 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 |
1,2-Benzenediol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis- - 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 |
1,2-Benzenediol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis- - 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
1,2-Benzenediol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis- - 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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