Azosulfon III [Spectrophotometric reagent for alkaline rare earth metals and indicator for precipitation titration of barium sulfate] CAS 68504-35-8
| CAS No. | 68504-35-8 |
| Molecular Formula | C22H12N4Na4O14S4 |
| Molecular Weight | 776.57 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Azosulfon III [Spectrophotometric reagent for alkaline rare earth metals and indicator for precipitation titration of barium sulfate] is closely related to a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
Azosulfon III [Spectrophotometric reagent for alkaline rare earth metals and indicator for precipitation titration of barium sulfate] (CAS 68504-35-8), molecular formula C22H12N4Na4O14S4 and molecular weight 776.57 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, Azosulfon III [Spectrophotometric reagent for alkaline rare earth metals and indicator for precipitation titration of barium sulfate] is typically pale yellow to yellow amorphous powder. Its solid-state physicochemical attributes — including a molecular weight of 776.57 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C22H12N4Na4O14S4 |
| Molecular Weight | 776.57 g/mol |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 19.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1976 |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 4 |
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