Pyrocatechol Violet CAS: 115-41-3
MF: C19H14O7S
MW: 386.38
A complexometric indicator.

Pyrocatechol Violet (CAS 115-41-3)

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Alternate Names: Catechol violet; Pyrocatecholsulfonphthalein
Application: Pyrocatechol Violet is a complexometric indicator
CAS Number: 115-41-3
Molecular Weight: 386.38
Molecular Formula: C19H14O7S
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data (including water content).
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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.

Appearance :
Powder
Physical State :
Solid
Solubility :
Soluble in water (60 mg/ml), ethylene glycol monomethyl ether (60 mg/ml), and ethanol (8 mg/ml).
Storage :
Store at room temperature
Melting Point :
185° C (lit.)(dec.)
Density :
~1.57 (Predicted) (tautomer)
Refractive Index :
n20D ~1.70 (Predicted)
pK Values :
pKa: 1, 7.82, 9.76, 11.7
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
WGK Germany :
3
PubChem CID :
MDL Number :
MFCD00005868
EC Number :
204-088-3
Beilstein Registry :
353938
SMILES :
C1=CC=C(C(=C1)/C(=C/2\\C=CC(=O)C(=C2)O)/C3=CC(=C(C=C3)O)O)S(=O)(=O)O

Download SDS (MSDS)

Certificate of Analysis

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