4-Bromoindole-2-carboxylic Acid CAS 16732-64-2
| CAS No. | 16732-64-2 |
| Molecular Formula | C9H6BrNO2 |
| Molecular Weight | 240.05 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
4-Bromoindole-2-carboxylic Acid (CAS 16732-64-2), molecular formula C9H6BrNO2 and molecular weight 240.05 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, bromine substitution, 4-Bromoindole-2-carboxylic Acid is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 240.05 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
As a certified reference material (CRM), 4-Bromoindole-2-carboxylic 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 | C9H6BrNO2 |
| Molecular Weight | 240.05 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1961 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 1 |
Related Bromoindole Standards
- 6-Bromoindole-3-carboxylic Acid (CAS 101774-27-0)
- 4-Bromoindole-3-carboxylic Acid (CAS 110811-31-9)
- 6-Bromoindole-2-carboxylic Acid (CAS 16732-65-3)
- 3-Bromoindole-2-carboxylic Acid (CAS 28737-33-9)
- 3-Bromoindole-5-carboxylic Acid (CAS 916179-87-8)
- 3-Bromoindole-6-carboxylic Acid (CAS 219508-19-7)
- 7-Bromoindole-3-carboxylic Acid (CAS 86153-25-5)
- 1-Acetyl-3-bromoindole (CAS 66417-73-0)
Recommended Standards
- 5-Bromo-2-methyl-4H-benzo[d][1,3]oxazin-4-one (CAS 16096-83-6)
- 1-(7-Bromobenzo[d]oxazol-2-yl)ethanone (CAS 1531866-61-1)
- 7-Bromo-1H-indole-2-carboxylic Acid (CAS 16732-71-1)
- 5-(4-Bromophenyl)isoxazol-3-ol (CAS 1501326-27-7)
- 5-Chloro-4-iodo-2-methylpyridine (CAS 1245134-39-7)
- tert-Butyl 4-(1H-indol-3-yl)-5,6-dihydropyridine-1(2H)-carboxylate (CAS 155302-27-5)
- 5-(3-Bromophenyl)nicotinic acid (CAS 924854-21-7)
- 4-Bromo-6-fluoro-3-iodo-1H-indazole (CAS 887567-87-5)
- cis-4-[2-(3-Fluorophenyl)-2-oxoethyl]-cyclohexane-1-carboxylic acid (CAS 735275-60-2)
- 2-(cyclohex-1-en-1-yl)pyridine (CAS 14159-55-8)
- 4-(Tert-butyl)-2-((dimethylamino)methylene)cyclohexan-1-one (CAS 66549-70-0)
- 1-Methyl-4-(6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)piperazine (CAS 1310383-04-0)
- 4-[4-(sec-Butyl)phenoxy]-2-methylphenylaminehydrochloride (CAS 1185296-26-7)
- Tau Peptide (245-274) (Repeat 1 Domain) trifluoroacetate salt (CAS 1428134-39-7)
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