Overview
4-Quinolinol, also known as 4-hydroxyquinoline, is a heterocyclic organic compound with a quinoline backbone substituted by a hydroxyl group at the 4-position. It serves as a versatile intermediate in the synthesis of pharmaceuticals, agrochemicals, and specialty chemicals. Its ability to form stable metal complexes makes it valuable in coordination chemistry and industrial applications. The compound is commercially available as a pale yellow to white crystalline powder. While it exhibits limited solubility in water, it dissolves well in organic solvents like ethanol and methanol. Its weakly acidic nature allows it to participate in various chemical reactions, including chelation and substitution processes.
Physical and Chemical Properties
4-Quinolinol has a molecular weight of 145.16 g/mol and typically melts between 195-198°C. Its crystalline form is stable under normal conditions but may degrade upon prolonged exposure to light or moisture. The compound's solubility profile makes it suitable for organic synthesis, where it is often dissolved in polar solvents. Key chemical properties include its ability to act as a bidentate ligand, forming coordination complexes with transition metals like copper and iron. This characteristic is exploited in catalysis and metallurgy. The hydroxyl group at the 4-position makes it reactive in electrophilic substitution reactions, enabling derivatization for specialized applications.
Main Applications
In the pharmaceutical industry, 4-quinolinol is a precursor to antimalarial drugs, antibacterial agents, and kinase inhibitors. Its derivatives are investigated for their bioactive properties, including antimicrobial and anticancer effects. The compound's metal-chelating ability is utilized in agrochemical formulations to enhance nutrient uptake or as a fungicidal component. Industrial applications include its use as a corrosion inhibitor in metal treatment processes and as a stabilizer in polymer production. Research settings employ 4-quinolinol as a building block for fluorescent probes and sensors due to its photophysical properties. The compound's versatility ensures demand across multiple sectors.
Safety and Storage
4-Quinolinol requires careful handling to avoid health risks. It may cause irritation upon contact with skin, eyes, or respiratory tract. Personal protective equipment (PPE) such as gloves, goggles, and dust masks should be worn during handling. In case of exposure, rinse affected areas thoroughly and seek medical advice if symptoms persist. Proper storage involves keeping the compound in a tightly sealed container, protected from light and moisture. A cool, well-ventilated area is ideal. Bulk quantities should be stored in labeled, non-reactive containers, away from oxidizing agents. Shelf life is typically several years when stored correctly, but material should be inspected for discoloration or clumping before use.
B2B Procurement Guide
When sourcing 4-quinolinol, buyers should prioritize suppliers with certified quality control processes. Key procurement considerations include purity levels (typically 98-99% for industrial use), packaging options (from grams to kilogram quantities), and compliance with regional chemical regulations. Reputable suppliers provide certificates of analysis (COA) and safety data sheets (SDS) upon request. Price negotiations should account for order volume, with discounts commonly available for bulk purchases. Buyers are advised to compare lead times, as specialty grades may require longer procurement cycles. For international shipments, verify import/export restrictions and ensure proper hazardous material documentation. Establishing long-term contracts with reliable suppliers can secure stable pricing and consistent quality.
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