Pyrocatechol Violet
Synonym(s):Catechol violet;Pyrocatecholsulfonphthalein
- CAS NO.：115-41-3
- Empirical Formula: C19H14O7S
- Molecular Weight: 386.38
- MDL number: MFCD00005868
- EINECS: 204-088-3
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-01-13 11:25:54
What is Pyrocatechol Violet?
Chemical properties
greenish yellow powder
The Uses of Pyrocatechol Violet
Pyrocatechol Violet is a complexometric indicator dye. This phthalein dye chelates metals to form blue to blue-violet complexs. It is also a pH indicator with a transition interval from 0 - 8 (red to violet). It is known to be unstable when alkaline. The stability is improved at a neutral pH. When the pH is between 2-7 the color may be yellow. Dyes and metabolites.
The Uses of Pyrocatechol Violet
A complexometric indicator.
What are the applications of Application
Pyrocatechol Violet is a complexometric indicator
Purification Methods
It is recrystallised from glacial acetic acid. It is very hygroscopic and is an indicator standard for metal complex titrations. [Mustafin et al. Zh Anal Khim 22 1808 1967, Beilstein 19/3 V 703.]
Properties of Pyrocatechol Violet
| Melting point: | 185 °C (dec.)(lit.) |
| Boiling point: | 659.5±55.0 °C(Predicted) |
| Density | 1.632±0.06 g/cm3(Predicted) |
| storage temp. | -20°C Freezer, Under inert atmosphere |
| solubility | H2O: 1 mg/mL, clear, red |
| form | Metallic or Crystalline Powder |
| pka | 7.21±0.10(Predicted) |
| color | Dark red-brown |
| PH Range | 6.0(YELLOW)-7.0(PURPLE)-9.0(PURPLISH RED) |
| Water Solubility | Soluble in water, ethylene glycol, monomethyl ether and ethanol. |
| BRN | 353938 |
| Stability: | Stable. Incompatible with strong oxidizing agents. |
| CAS DataBase Reference | 115-41-3(CAS DataBase Reference) |
| EPA Substance Registry System | 1,2-Benzenediol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis- (115-41-3) |
Safety information for Pyrocatechol Violet
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. |
Computed Descriptors for Pyrocatechol Violet
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