| Identification | More | [Name]
Pyrocatechol Violet | [CAS]
115-41-3 | [Synonyms]
3,3',4'-TRIHYDROXYFUCHSONE-2''-SULFONIC ACID
A,A-BIS(3,4-DIHYDROXYPHENYL)-A-HYDROXY-O-TOLUENESULFONIC ACID G-SULFONE
CATECHOLSULFONAPHTHALEIN
CATECHOL VIOLET
PYROCATECHOLSULFONEPHTHALEIN
PYROCATECHOLSULFONPHTHALEIN
PYROCATECHOL SULPHONPHTHALEIN
PYROCATECHOL VIOLET
1,2-Benzenediol,4,4’-(3H-2,1-benzoxathiol-3-ylidene)bis-,S,S-dioxide
3’,3’,4’-Trihydroxyfuchsone-2’-SulfonicAcidPV
PyrocatechinSulfonphthaleinViolet
Pyrocatechimsulfonphthalein violed
PYROCATECHOL VIOLET, FOR COLORIMETRY
PYROCATECHOL VIOLET INDICATOR FOR METAL TITRATION
PYROCATECHOL VIOLET, INDICATOR GRADE
PyrocatecholVioletGr
Pyrocatechol Violet, indicator grade, pure
1,2-Benzenediol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis-
Catecholsulfonphthalein
Catechol violet, Pyrocatecholsulfonphthalein | [EINECS(EC#)]
204-088-3 | [Molecular Formula]
C19H14O7S | [MDL Number]
MFCD00005868 | [Molecular Weight]
386.38 | [MOL File]
115-41-3.mol |
| Chemical Properties | Back Directory | [Appearance]
greenish yellow powder | [Melting point ]
185 °C (dec.)(lit.) | [Boiling point ]
659.5±55.0 °C(Predicted) | [density ]
1.632±0.06 g/cm3(Predicted) | [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) | [Stability:]
Stable. Incompatible with strong oxidizing agents. | [Water Solubility ]
Soluble in water, ethylene glycol, monomethyl ether and ethanol. | [BRN ]
353938 | [CAS DataBase Reference]
115-41-3(CAS DataBase Reference) | [EPA Substance Registry System]
115-41-3(EPA Substance) |
| Safety Data | Back Directory | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin . | [Safety Statements ]
S24/25:Avoid contact with skin and eyes . | [WGK Germany ]
3
| [TSCA ]
Yes | [HS Code ]
32041900 |
| Hazard Information | Back Directory | [Chemical Properties]
greenish yellow powder | [Uses]
A complexometric indicator. | [Uses]
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. | [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.] |
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