Chlorophenol red

Chlorophenol red

Names
IUPAC name 2-Chloro-4-[3-(3-chloro-4-hydroxyphenyl)-1,1-dioxobenzo[c]oxathiol-3-yl]phenol
Identifiers
CAS Number	4430-20-0
3D model (Jmol)	Interactive image
ChemSpider	19293
ECHA InfoCard	100.022.382
EC Number	224-619-2
PubChem	20486
InChI InChI=1S/C19H12Cl2O5S/c20-14-9-11(5-7-16(14)22)19(12-6-8-17(23)15(21)10-12)13-3-1-2-4-18(13)27(24,25)26-19/h1-10,22-23H Key: WWAABJGNHFGXSJ-UHFFFAOYSA-N InChI=1/C19H12Cl2O5S/c20-14-9-11(5-7-16(14)22)19(12-6-8-17(23)15(21)10-12)13-3-1-2-4-18(13)27(24,25)26-19/h1-10,22-23H Key: WWAABJGNHFGXSJ-UHFFFAOYAK
SMILES C1=CC=C2C(=C1)C(OS2(=O)=O)(C3=CC(=C(C=C3)O)Cl)C4=CC(=C(C=C4)O)Cl
Properties
Chemical formula	C19H12Cl2O5S
Molar mass	423.27 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

{{{indicator_name}}} (pH indicator)
below pH 4.8		above pH 6.7
4.8	⇌	6.7

Chlorophenol red is an indicator dye that changes color from yellow to violet in the pH range 4.8 to 6.7. The lambda max is at 572 nm.

References