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organic compounds
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—HO 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.
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—HO 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.
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