Quinoline-4-carboxylic Acid

The title acid, C₁₀H₇NO₂, crystallized in the centrosymmetric space group P2₁/c with one molecule in the asymmetric unit. There is a single hydrogen bond, O—H...N, with donor-acceptor distance of 2.596 (1) Å. The carboxylic H atom is ordered. The dihedral angle between the best-fit quinoline core plane and the carboxyl plane is 45.9 (1)°. Structural comparisons are made with the closely related molecule, 2-phenylquinoline-4-carboxylic acid.

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