4-(3-Phenanthryl)butanoic Acid

The title compound, C₁₈H₁₆O₂, crystallized in the centrosymmetric space group P2₁/a. The single type of carboxylic hydrogen bond forms cyclic dimers about centers of symmetry. The carboxylic H atom is ordered as are the carboxylic O atoms. This structure comprises double layers of aromatic rings in a herringbone array separated by double layers of hydrogen-bonded aliphatic strings and is a very close analog of the structures of 4-(2-naphthyl)butanoic acid and other terminally aryl-substituted n-aliphatic carboxylic acids.

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