Cresol Red

Cresol red (full name: o-cresolsulfonephthalein) is a triarylmethane dye frequently used for monitoring the pH in aquaria.

Cresol red (pH indicator)
below pH 7.2 above pH 8.8
7.2 ⇌ 8.8
Cresol Red
Names
Preferred IUPAC name
3,3-Bis(4-hydroxy-3-methylphenyl)-2,1λ6-benzoxathiole-1,1(3H)-dione
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.015.513
PubChem CID
UNII
  • InChI=1S/C21H18O5S/c1-13-11-15(7-9-18(13)22)21(16-8-10-19(23)14(2)12-16)17-5-3-4-6-20(17)27(24,25)26-21/h3-12,22-23H,1-2H3 Y
    Key: OBRMNDMBJQTZHV-UHFFFAOYSA-N Y
  • InChI=1/C21H18O5S/c1-13-11-15(7-9-18(13)22)21(16-8-10-19(23)14(2)12-16)17-5-3-4-6-20(17)27(24,25)26-21/h3-12,22-23H,1-2H3
    Key: OBRMNDMBJQTZHV-UHFFFAOYAD
SMILES
  • Cc1cc(ccc1O)/C(=C/2C=CC(=O)C(=C2)C)c3ccccc3OS(O)=O
Properties
C21H17NaO5S
Molar mass 382.43 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references
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