Cresol Purple CAS 2303-01-7

Introduction：Basic information about Cresol Purple CAS 2303-01-7, including its chemical name, molecular formula, synonyms, physicochemical properties, and safety information, etc.

Cresol Purple Basic information

• Product Name: Cresol Purple
• Synonyms: M-CRESOL PURPLE, INDICATOR GRADE;M-CRESOL PURPLE FREE ACID;M-CRESOL PURPLE INDICATOR;Phenol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis3-methyl-;m-Cresolpurpl;M-CRESOLSULFONPHTHALEIN;M-CRESOLSULFONEPHTHALEIN;M-CRESOL PURPLE
• CAS: 2303-01-7
• MF: C21H18O5S
• MW: 382.43
• EINECS: 218-960-6
• Product Categories: Sulfonephthalein;Analytical Chemistry;Indicator (pH);pH Indicators;Organics
• Mol File: 2303-01-7.mol

Cresol Purple Chemical Properties

• Melting point: >250°C
• Boiling point: 577.5±50.0 °C(Predicted)
• bulk density: 480kg/m3
• density: 1.404±0.06 g/cm3(Predicted)
• storage temp.: room temp
• solubility: Very slightly soluble in water, ethanol; soluble in methanol
• pka: 1.51, 8.32(at 25℃)
• form: Liquid
• color: Dark green
• PH Range: 1.2 (red) - 2.8 (yellow) and 7.4 (yellow) - 9.0 (purple)
• Water Solubility: Soluble in water and sodium hydroxide solution. Slightly soluble in alcohol.
• ε(extinction coefficient): ≥ 11000 at 295-301nm at 0.01g/L (0.01 G/L in 0.005 N NAOH in Methanol) ≥26000 at 578-584nm at 0.01g/L (in 0.005 N NAOH in Methanol) ≥8000 at 369-375nm at 0.01g/L (in 0.005 N NAOH in Methanol)
• λmax: 579nm, 371nm
• Merck: 14,2577
• BRN: 350314
• Stability: Stable. Incompatible with strong oxidizing agents.
• Major Application: Fuel cells, sensors, display device, falsification-proof security paper, inks, correction fluid, paints, detection of electrophilic gases, lubricants, cement products, packaging system, adhesive, cosmetics, food storage, determining glucose in dialysis solution, screening of cat diseases, detecting carbohydrates, oral hygiene products
• InChI: 1S/C21H18O5S/c1-13-11-15(22)7-9-17(13)21(18-10-8-16(23)12-14(18)2)19-5-3-4-6-20(19)27(24,25)26-21/h3-12,22-23H,1-2H3
• InChIKey: OLQIKGSZDTXODA-UHFFFAOYSA-N
• SMILES: Cc1cc(O)ccc1\C(=C2/C=CC(=O)C=C2C)c3ccccc3S(O)(=O)=O
• EPA Substance Registry System: Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[3-methyl- (2303-01-7)

Safety Information

• Safety Statements: 24/25
• WGK Germany: WGK 2 water endangering
• TSCA: TSCA listed
• HS Code: 2934 99 90
• Storage Class: 11 - Combustible Solids

Cresol Purple Usage And Synthesis

Chemical Properties

green crystalline powder

Uses

Acid-base indicator.

Uses

m-Cresol Purple acts as a pH indicator dye. It plays an important role in spectrophotometric pH measurements. It operates in the pH ranges 1.2 - 2.8 (red to yellow) and 7.4 - 9.0 (yellow to violet). Further, it is employed to stain epithelial cells and proteins.

Biochem/physiol Actions

m-Cresol purple is a pH indicator. It changes from red (pH 1.2) to yellow (2.8) and yellow (7.4) to purple (9.0).