Pyrocatechol Violet

CAS: 115-41-3

Ref. TR-P998890

Product Information

• Name: Pyrocatechol Violet
• Synonyms: Catechol Violet, Pyrocatecholsulfonphthalein, 4,4'-(1,1-Dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[1,2-benzenediol], 3,3-Bis(3,4-dihydroxyphenyl)-3H-2,1-benzoxathiole 1,1-Dioxide, NSC 8805, PKF,Pyrocatechin Sulfonephthalein, Pyrocatechol Sulfonephthalein, 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis-1,2-benzenediol S,S-Dioxide, 1,2-Benzenediol, 4,4′-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis-, 1,2-Benzenediol, 4,4′-(3H-2,1-benzoxathiol-3-ylidene)bis-, S,S-dioxide, 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, 3,3-Bis(3,4-dihydroxyphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide, 3H-2,1-Benzoxathiole, 1,2-benzenediol deriv., 3H-2,1-Benzoxathiole, 3,3-bis(3,4-dihydroxyphenyl)-, 1,1-dioxide, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiole-3,3-diyl)dibenzene-1,2-diol, 4,4′-(1,1-Dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[1,2-benzenediol], Alpha,Alpha-Bis(3,4-Dihydroxyphenyl)Toluene-2,Alpha-Sultone, Catecholsulfonphthalein, Catecholsulphonephthalein, Pyrocatechin sulfonephthalein, Pyrocatechin violet, Pyrocatechol sulfonephthalein, Pyrocatechol sulphonephthalein, Pyrocatechol, 4,4′-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide, Pyrocatecholsulfonephthalein

Description

Applications 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.
References Ng, C. H., et al.: Dyes Pigm., 115 96 (2015); Lee, C. Y., et al.: Chem. Asian J., 9, 706 (2014)

• Brand: TRC

Chemical properties

• Molecular weight: 386.38
• Formula: C₁₉H₁₄O₇S
• Color/Form: Very Dark Red to Black Solid
• InChI: InChI=1S/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)26-19/h1-10,20-23H
• InChI key: InChIKey=RRRCKIRSVQAAAS-UHFFFAOYSA-N
• SMILES: O=S1(=O)OC(c2ccc(O)c(O)c2)(c2ccc(O)c(O)c2)c2ccccc21