Dobson A J, Gerkin R E
Department of Chemistry, Ohio State University, Columbus 43210, USA.
Acta Crystallogr C. 1998 Jun 15;54 ( Pt 6):795-8. doi: 10.1107/s0108270197018738.
The title acid, C13H10O2, crystallized in the centrosymmetric space group P2(1)/c with four molecules in the asymmetric unit. These four molecules form two pairs of cyclic hydrogen-bonded dimers of the usual sort, but these are not formed about centers of symmetry. The Odonor...Oacceptor distances in these hydrogen bonds are 2.660(3), 2.638(3), 2.676(3) and 2.634(3) A. The carboxylic H atoms and the carboxylic O atoms are ordered. The biphenyl twist angles range from 46.5(2) to 52.5(2) degrees. The dihedral angles between the carboxyl group planes and the planes of the rings to which they are attached range from 43.6(3) to 50.9(3) degrees. In the two latter respects, this structure differs appreciably from the structures of the other two biphenyl monocarboxylic acids. The structure is layered parallel to the ab plane.
该标题酸，化学式为C13H10O2，在中心对称空间群P2(1)/c中结晶，不对称单元中有四个分子。这四个分子形成了两对常见的环状氢键二聚体，但这些二聚体并非围绕对称中心形成。这些氢键中供体氧原子与受体氧原子之间的距离分别为2.660(3)、2.638(3)、2.676(3)和2.634(3)埃。羧基氢原子和羧基氧原子有序排列。联苯扭转角范围为46.5(2)至52.5(2)度。羧基平面与其所连接环的平面之间的二面角范围为43.6(3)至50.9(3)度。在这后两个方面，该结构与其他两种联苯单羧酸的结构有明显不同。该结构平行于ab平面呈层状排列。
