3,3,5,5-Tetrabromophenolphthalein ethyl ester potassium salt, indicator CAS 62637-91-6
| CAS No. | 62637-91-6 |
| Molecular Formula | C22H13Br4KO4 |
| Molecular Weight | 700.05 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
3,3,5,5-Tetrabromophenolphthalein ethyl ester potassium salt, indicator (CAS 62637-91-6) is a high-purity analytical reference standard with the molecular formula C22H13Br4KO4 and a molecular weight of 700.05 g/mol.
Owing to a salt form, a flavonoid core, a hydroxyl group, an ether linkage, bromine substitution, 3,3,5,5-Tetrabromophenolphthalein ethyl ester potassium salt, indicator is typically pale yellow to yellow amorphous powder. Its solid-state physicochemical attributes — including a molecular weight of 700.05 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C22H13Br4KO4 |
| Molecular Weight | 700.05 g/mol |
| Purity | 97%+ |
| Storage | Store at room temperature, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 14.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1974 |
| Halogen Content | Br-containing |
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