Arsenazo III CAS 1668-00-4
| CAS No. | 1668-00-4 |
| Molecular Formula | C22H18As2N4O14S2 |
| Molecular Weight | 776.37 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Arsenazo III.
CATO supplies Arsenazo III (CAS 1668-00-4), a certified reference material (molecular formula C22H18As2N4O14S2, MW 776.37 g/mol) for analytical method development and quality control.
Owing to a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, Arsenazo III is typically pale yellow to yellow amorphous powder. Its solid-state physicochemical attributes — including a molecular weight of 776.37 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 | C22H18As2N4O14S2 |
| Molecular Weight | 776.37 g/mol |
| Purity | >90% |
| 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) | 16.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 2 |
Related Arsenazo Standards
Recommended Standards
- Cangrelor (CAS 163706-06-7)
- [[1,1′-Biphenyl]-2-ylbis(1,1-dimethylethyl)phosphine][1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamidato-κN]gold (CAS 1036000-94-8)
- 4ME 16:0 Diether PE (CAS 150135-14-1)
- Azosulfon III [Spectrophotometric reagent for alkaline rare earth metals and indicator for precipitation titration of barium sulfate] (CAS 68504-35-8)
- Fmoc-N-Me-D-Dap(Boc)-OH (CAS 1424972-75-7)
- (2-((2,5-Dimethylbenzyl)thio)-4,5-dihydro-1H-imidazol-1-yl)(thiophen-2-yl)methanone (CAS 851804-74-5)
- 3,3-DImethoxypiperidine (CAS 765962-69-4)
- 1-Ethyl-1H-tetrazol-5-amine (CAS 65258-53-9)
- 3-(2-(2,5-Dimethyl-1H-pyrrol-1-yl)thiophen-3-yl)-3-oxopropanenitrile (CAS 478078-01-2)
- 1-([1,1'-Biphenyl]-4-yl)-3-((4-methoxyphenyl)amino)propan-1-one (CAS 279672-28-5)
- 3-(3-Aminopropyl)benzoic Acid Hydrochloride (CAS 1346604-68-9)
- 5-Nitro-6-(trifluoromethyl)-1H-indazole (CAS 1187211-61-5)
- 1-(4-Methoxyphenyl)-5-(3-(trifluoromethyl)phenyl)-1H-tetrazole (CAS 339108-62-2)
- Semaglutide impurity 87 (CAS CATO-C4X-222687)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com