A low-temperature polymorph of 1,1′:3′,1′′:3′′,1′′′:3′′′,1′′′′-quinquephenyl (m-quinquephenyl), C30H22, crystallizes in the space groupP21/cwith two molecules in the asymmetric unit. The crystal is a three-component nonmerohedral twin. A previously reported room-temperature polymorph [Rabideau, Sygula, Dhar & Fronczek (1993).Chem. Commun.pp. 1795–1797] also crystallizes with two molecules in the asymmetric unit in the space groupP\overline1}. The unit-cell volume for the low-temperature polymorph is 4120.5 (4) Å3, almost twice that of the room-temperature polymorph which is 2102.3 (6) Å3. The molecules in both structures adopt a U-shaped conformation with similar geometric parameters. The structural packing is similar in both compounds, with the molecules lying in layers which stack perpendicular to the longest unit-cell axis. The molecules pack alternately in the layers and in the stacked columns. In both polymorphs, the only interactions between the molecules which can stabilize the packing are very weak C—H...π interactions.
1,1′:3′,1′:3′,1′,1′:3′,1′,1′′′′-喹庚基苯基(间喹庚基苯基)(C30H22)的一种低温多晶体在空间群 P21/c 中结晶,不对称单元中有两个分子。该晶体是一种三组分非多面体孪晶。以前报道过的一种室温多晶体[Rabideau, Sygula, Dhar & Fronczek (1993).Chem. Commun.pp. 1795-1797]也是在空间群 P/overline1} 的不对称单元中有两个分子的结晶。低温多晶型的单位晶胞体积为 4120.5 (4) Å3,几乎是室温多晶型的两倍,后者的单位晶胞体积为 2102.3 (6) Å3。两种结构中的分子都呈 U 形构象,几何参数相似。两种化合物的结构堆积相似,分子层层堆积,垂直于最长的单位晶胞轴。分子交替堆积在层中和堆积柱中。在这两种多晶型化合物中,分子间唯一能稳定堆积的相互作用是非常微弱的 C-H...π 相互作用。