Anthracene-1-carboxylic Acid

The title compound, C₁₅H₁₀O₂, was found to crystallize in the centrosymmetric space group P2₁/n. The hydrogen bonding is of the cyclic dimer type about a center of symmetry. The carboxyl O atoms are ordered as is the carboxyl H atom. The anthracene core, while not as planar, shows good agreement with the anthracene cores of anthracene-9-carboxylic acid and anthracene-1,6-dicarboxylic acid. The carboxyl group plane makes a dihedral angle of 12.4 (2)° with the best-fit anthracene core plane.

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