CAS 148-24-3 | 8-Quinolinol | Oxine | 8-HQ
8-Hydroxyquinoline (8-HQ, CAS 148-24-3) is a crystalline quinoline derivative valued for its metal-chelating functionality. It is used as an analytical reagent and as an intermediate or functional building block in pharmaceutical, fine-chemical and electronic-material applications. Palica Chem supplies 8-Hydroxyquinoline for bulk evaluation with batch documentation and international shipment support.
The adjacent nitrogen and hydroxyl donor sites enable 8-Hydroxyquinoline to form stable complexes with many metal ions. Customers evaluate the free base for analytical chemistry and metal-ion separation, pharmaceutical and agrochemical synthesis, fine-chemical manufacturing, and functional materials including OLED-related intermediates. Suitability depends on the process, purity requirements and downstream regulatory status.
The free base is slightly soluble in water and is typically selected when the formulation or synthesis can accommodate its solubility profile. For water-based systems, compare it with 8-Hydroxyquinoline Sulfate; for a pre-formed copper complex used in selected fungicidal and mildew-control applications, review Copper 8-Hydroxyquinoline. Specify CAS 148-24-3 when requesting the free-base grade.
| CAS number | 148-24-3 |
|---|---|
| EC / EINECS number | 205-711-1 |
| HS code | 2933.49 — the six-digit heading; national tariff codes extend it |
| Synonyms | 8-Quinolinol, Oxine, 8-HQ |
| Molecular formula | C9H7NO |
| Molecular weight | 145.16 g/mol |
| Appearance | White to off-white crystalline powder |
| Melting point | 73–75 °C |
| Boiling point | 267 °C |
| pKa | ≈5.0 (quinolinium N–H+), ≈9.9 (phenolic –OH) |
| Solubility | Slightly soluble in water; soluble in ethanol, acetone, chloroform and benzene, and in dilute acids and alkalis |
These are literature values for the substance, not a lot specification. The certificate of analysis for the supplied batch carries the measured assay and impurity profile; request the current specification and SDS for qualification.
Qualifying 8-Hydroxyquinoline for a new process or an alternative source? Request the current specification, SDS and recent batch COA information. For a quotation, share your required quantity, destination, intended application and any target assay or impurity limits. You can also send your existing specification for a direct technical comparison. Compare the free base, sulfate and copper chelate before selecting a form.
Confirm the chemical identity, synonyms and molecular information in PubChem.
Tell us the grade and volume you need. Your message goes straight to our technical sales team.