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The title compound, C16H14O4, crystallized in the centrosymmetric space group P21/c with a single molecule in the asymmetric unit. The two carboxyl H atoms are ordered and are involved in hydrogen bonds whose Od...Oa distances are 2.660 (2) and 2.641 (2) Å. Each of the hydrogen bonds forms a cyclic hydrogen-bonded dimer about a center of symmetry. Thus, each molecule is linked to two others to form a chain. The structure comprises two sets of such chains linked, not by conventional hydrogen bonds, but by one significantly attractive C—H...O interaction. The intra­molecular dihedral angle between the ring planes (twist angle) is 84.9 (1)°. The dihedral angles between the carboxyl-group planes and the planes of the rings to which they are attached are 36.7 (1) and 21.4 (1)°. A number of comparisons are made with the structure of the `parent' compound, biphenyl-2,2′-dicarboxylic acid.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, fr1132

hkl

Structure factor file (CIF format)
Contains datablock fr1132

CCDC reference: 130400

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