Overview
8-Hydroxyquinoline is an important heterocyclic compound with a hydroxyl group at the 8-position of the quinoline ring. First synthesized in the late 19th century, this compound has gained industrial significance due to its unique chelating properties and broad-spectrum antimicrobial activity. Its molecular structure allows it to form stable complexes with various metal ions, making it valuable in multiple technical applications. In the B2B context, 8-hydroxyquinoline is typically supplied as a technical grade (95-98% purity) or higher purity pharmaceutical grade. Major global producers are located in China, India, and Europe, with production capacities ranging from hundreds to thousands of metric tons annually. The compound serves as a key intermediate for more complex chemical derivatives.
Physical and Chemical Properties
As a crystalline solid, 8-hydroxyquinoline exhibits characteristic faint phenolic odor. The compound shows weak acidity (pKa ~9.9) due to the hydroxyl group, while the nitrogen in the quinoline ring provides basic properties. This amphoteric nature contributes to its excellent metal-chelating capabilities, particularly for transition metals like copper, iron, and zinc. Notable chemical behavior includes fluorescence under UV light (λex ~365 nm) and formation of colored complexes with metal ions. The compound is relatively stable under normal conditions but may darken upon prolonged exposure to light. Its partition coefficient (log P ~2.6) indicates moderate lipophilicity, influencing its biological activity and formulation properties.
Main Applications
In pharmaceuticals, 8-hydroxyquinoline serves as the core structure for antiseptic preparations (e.g., clioquinol) and antimalarial drugs. Its metal-chelating properties make it valuable in analytical chemistry for gravimetric analysis and as a reagent in spectrophotometric methods. The agrochemical industry utilizes derivatives as fungicides and bactericides for crop protection. Industrial applications include use as a corrosion inhibitor for metals, particularly in cooling systems. The compound also finds niche uses in dye synthesis, photographic chemicals, and as a stabilizer for polymers. Recent research explores its potential in OLED materials and as a ligand in catalytic systems.
Safety and Storage
8-Hydroxyquinoline requires careful handling as it may cause skin irritation and serious eye damage. Appropriate PPE including gloves, goggles, and dust masks should be used when handling the powder form. The compound is classified as harmful if swallowed (H302) and may cause respiratory irritation (H335). Storage should be in tightly sealed containers under inert atmosphere to prevent oxidation. Compatibility considerations include keeping away from strong oxidizers and acids. Shelf life typically exceeds 2 years when stored properly at room temperature. Spills should be contained with inert absorbent materials and disposed according to local regulations.
B2B Procurement Guide
Industrial buyers should specify required purity (typically 98-99.5%), crystal size (for formulation applications), and packaging preferences (25kg fiber drums being most common). Technical grade is suitable for most industrial uses, while pharmaceutical applications require additional documentation including DMFs and impurity profiles. Key procurement considerations include batch-to-batch consistency, heavy metal content specifications, and supplier capability to provide certificates of analysis. For large-volume purchases (metric ton quantities), buyers may negotiate price breaks of 10-20%. Just-in-time delivery is recommended due to the compound's limited shelf stability once opened.
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