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7-chloroquinoline-5-carboxylic acid; CAS No.: 1936252-00-4;7-chloroquinoline-5-carboxylic acid. PROPERTIES: 7-chloroquinoline-5-carboxylic acid is a halogenated quinoline carboxylic acid with molecular formula C10H6ClNO2. This crystalline powder typically appears off-white and has a melting point ranging between 210-215 C. The molecule contains a quinoline core with a chlorine atom at position 7 and a carboxylic acid group at position 5. The 7-chloroquinoline-5-carboxylic acid exhibits acidic character with a pKa value around 2.9 for the carboxylic acid group. It demonstrates moderate solubility in water and good solubility in polar organic solvents like methanol. Proper storage requires a tightly sealed container in a cool, dark environment below 25 C to prevent moisture-induced degradation. Safety precautions include using N95 respiratory protection and chemical-resistant gloves, as the compound may cause respiratory irritation and skin corrosion. According to EU safety regulations, it carries H314 and H335 hazard statements for causing severe skin burns and respiratory tract irritation. APPLICATIONS: The 7-chloroquinoline-5-carboxylic acid molecule serves as a versatile intermediate in pharmaceutical synthesis, particularly valuable for creating quinoline-based non-steroidal anti-inflammatory drugs, as reported in medicinal chemistry journals. The chloro substituent provides a site for further functionalization via nucleophilic aromatic substitution reactions. Additionally, 7-chloroquinoline-5-carboxylic acid derivatives have been investigated for their potential as matrix-assisted laser desorption/ionization (MALDI) mass spectrometry matrices, as described in analytical chemistry research. The compound's ability to form stable complexes with organic molecules has also made it useful in developing chemical probes for biomolecular interaction studies, as documented in bioanalytical chemistry publications focusing on protein-ligand binding assays.