o-Cresolphthalein Complexone
Synonym(s):Phthalein purple;Xylenolphthalein-bis(iminodiacetic acid), Metal phthaleine, Cresol phthalexone;Xylenylphthalein-bisiminodiacetic acid;o-Cresolphthalein-3′,3′′-bis-methyleneiminodiacetic acid;o-Cresolphthalexon
- CAS NO.：2411-89-4
- Empirical Formula: C32H32N2O12
- Molecular Weight: 636.61
- MDL number: MFCD00005911
- EINECS: 219-318-8
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-08-21 22:41:43
What is o-Cresolphthalein Complexone?
Chemical properties
White powder
The Uses of o-Cresolphthalein Complexone
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.
What are the applications of Application
o-Cresolphthalexon is an alkaline earth metal indicator
Purification Methods
o-Cresolphthalein (a complexon precursor without the two bis-carboxymethylamino groups) is a contaminant and is one of the starting materials. It can be removed by dissolving the reagent in H2O and adding a 3-fold excess of sodium acetate and fractionally precipitating it by dropwise addition of HCl to the clear filtrate. Wash the precipitate with cold H2O and dry the monohydrate at 30o in a vacuum. The pure material gives a single spot on paper chromatography (eluting solvent EtOH/water/phenol, 6:3:1, and developing with NaOH). [Anderegg et al. Helv Chim Acta 37 113 1954.] It complexes with Ba, Ca, Cd, Mg and Sr. [Beilstein 18 III/IV 8141.]
Properties of o-Cresolphthalein Complexone
| Melting point: | 181-185 °C (dec.)(lit.) |
| Boiling point: | 892.1±65.0 °C(Predicted) |
| Density | 1.515±0.06 g/cm3(Predicted) |
| storage temp. | Store below +30°C. |
| solubility | NaOH: soluble50mg/mL |
| form | Powder |
| pka | 1.47, 8.24(at 25℃) |
| color | white to off-white |
| PH Range | Colorless (8.2) to red (9.8) |
| Water Solubility | SLIGHTLY SOLUBLE |
| λmax | 575nm, 377nm |
| BRN | 381994 |
| Stability: | Stable. Incompatible with strong oxidizing agents. |
| Major Application | Sensors, photoconductors, copying materials, rubber, body fiuid testing, determination of calcium, magnesium, tin, method for measuring urea nitrogen, liposomal construct for diagnostic use, cardiovascular disease, antibacterial agent |
| EPA Substance Registry System | Glycine, N,N'-[(3-oxo-1(3H)-isobenzofuranylidene)bis[(6-hydroxy-5-methyl-3,1-phenylene)methylene]]bis[N-(carboxymethyl)- (2411-89-4) |
Safety information for o-Cresolphthalein Complexone
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for o-Cresolphthalein Complexone
| InChIKey | IYZPEGVSBUNMBE-UHFFFAOYSA-N |
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