3,5-Diiodosalicylic Acid CAS 133-91-5
| CAS No. | 133-91-5 |
| Molecular Formula | C7H4I2O3 |
| Molecular Weight | 389.91 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to a carboxylic acid group, a hydroxyl group, an ether linkage, iodine substitution, an aromatic ring system, 3,5-Diiodosalicylic Acid is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 389.91 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).
3,5-Diiodosalicylic Acid (CAS 133-91-5) is a high-purity analytical reference standard with the molecular formula C7H4I2O3 and a molecular weight of 389.91 g/mol.
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 | C7H4I2O3 |
| Molecular Weight | 389.91 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | >95% |
| Storage | Store in a cool place (≤25°C), keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | I-containing |
Related Diiodosalicylic Standards
Recommended Standards
- 3,5-Diiodo-4-hydroxybenzoic Acid (CAS 618-76-8)
- 2,4-Diiodo-6-nitroaniline (CAS 116529-49-8)
- N-Butyl-N-(3-chloroquinoxalin-2-yl)-4-methylbenzene-1-sulfonamide (CAS 554405-52-6)
- MAM2201 N-(5-chloropentyl) Analog (CAS 1445578-25-5)
- 2-Bromo-1,3,5-benzenetricarbonitrile (CAS 13520-05-3)
- 4-[(3-Hydroxy-propylamino)-phenyl-methyl]-phenol (CAS 626214-22-0)
- ((2-(2-Iodophenyl)propan-2-yl)oxy)(trifluoromethyl)sulfane (CAS 1584705-82-7)
- 3-[2-(Boc-amino)ethoxy]phenylboronic Acid Pinacol Ester (CAS 1505516-19-7)
- cis-4-(4-Methoxybenzoyl)cyclohexane-1-carboxylic acid (CAS 61468-99-3)
- n-Cyclopropyl-2-(o-tolylamino)acetamide (CAS 1021236-68-9)
- 2-Cyclopropoxy-1-isopropoxy-3-methylbenzene (CAS 1243389-89-0)
- Bis(2,5-dioxopyrrolidin-1-yl) nonanedioate (CAS 106664-96-4)
- 65871-23-0 METHANETHIOL-D4 (CAS 65871-23-0)
- Semaglutide Main Chain P29 (CAS 1169630-82-3)
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