Abstract
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.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
