4-((2,4-Dimethylphenyl)diazenyl)-3-hydroxynaphthalene-2,7-disulfonic acid CAS 7481-49-4
| CAS No. | 7481-49-4 |
| Molecular Formula | C18H16N2O7S2 |
| Molecular Weight | 436.46 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 4-((2,4-Dimethylphenyl)diazenyl)-3-hydroxynaphthalene-2,7-disulfonic acid 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.
4-((2,4-Dimethylphenyl)diazenyl)-3-hydroxynaphthalene-2,7-disulfonic acid (CAS 7481-49-4), molecular formula C18H16N2O7S2 and molecular weight 436.46 g/mol, is a CATO reference standard with documented purity and traceability.
4-((2,4-Dimethylphenyl)diazenyl)-3-hydroxynaphthalene-2,7-disulfonic acid (C18H16N2O7S2) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 4-((2,4-Dimethylphenyl)diazenyl)-3-hydroxynaphthalene-2,7-disulfonic acid meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C18H16N2O7S2 |
| Molecular Weight | 436.46 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) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1959 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 2 |
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