Thermo Scientific Chemicals o-Cresolphthalein complexone, indicator grade

Indicator for complexometric titration of Mg, Ca, Sr and Ba. It is used as an alkaline earth metal ion indicator. Suggested to be colorless at pH 11, but turns pink in the presence of alkaline earth metals. Also utilized in an auto analyzer to determine serum calcium.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.

Applications
Indicator for complexometric titration of Mg, Ca, Sr and Ba. It is used as an alkaline earth metal ion indicator. Suggested to be colorless at pH 11, but turns pink in the presence of alkaline earth metals. Also utilized in an auto analyzer to determine serum calcium.

Solubility
Soluble in NaOH (50 mg/ml), aqueous ammonia, and organic solvents. Insoluble in water.

Notes
Store away from strong oxidizing agents. Keep container tightly closed. Store in cool, dry conditions in well sealed containers.

Chemical Identifiers

CAS

2411-89-4

Molecular Formula

C32H32N2O12

Molecular Weight (g/mol)

636.61

MDL Number

MFCD00005911

InChI Key

IYZPEGVSBUNMBE-UHFFFAOYSA-N

Synonym

o-cresolphthalein complexone, phthalein purple, cresolphthalexon, o-cresolphthalexon, phthalein complexon, o-cresolphthalein complexon, cresolphthalein complexon, metal phthalein, cresolphthalein complexone, unii-a4p6737i7f

PubChem CID

75485

IUPAC Name

2-[[5-[1-[3-[[bis(carboxymethyl)amino]methyl]-4-hydroxy-5-methylphenyl]-3-oxo-2-benzofuran-1-yl]-2-hydroxy-3-methylphenyl]methyl-(carboxymethyl)amino]acetic acid

SMILES

CC1=CC(=CC(CN(CC(O)=O)CC(O)=O)=C1O)C1(OC(=O)C2=CC=CC=C12)C1=CC(C)=C(O)C(CN(CC(O)=O)CC(O)=O)=C1

Melting Point

∽198°C (decomposition)

Quantity

5 g

Beilstein

381994

Solubility Information

Soluble in NaOH (50mg/ml),aqueous ammonia,and organic solvents. Insoluble in water.

Formula Weight

636.62

Grade

Indicator

Chemical Name or Material

o-Cresolphthalein complexone

EINECSNumber

219-318-8

TSCA

Yes

Recommended Storage

Ambient temperatures

SDS

EINECSNumber

219-318-8

TSCA

Yes

Recommended Storage

Ambient temperatures

SDS

RUO – Research Use Only