Biphenyl contains a direct bond between two phenyl functional groups, and the dihedral angle between the two phenyl groups has been discussed in terms of electronic and steric stabilization. Facile rotation about the C–C bond between the two phenyl components is expected to occur at high temperature. Here, we report observations of the rotational dynamics of. The structure and rotational dynamics of the rotor exhibit a remarkable temperature dependence. In accordance with the amplification of the angular displacement of the biphenylene inside a crystal with increasing temperature, the birefringence of the single crystal decreased.

中文翻译：

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带有联苯吡咯的结晶分子陀螺及其温度依赖性双折射

联苯在两个苯基官能团之间包含一个直接键，并且已经在电子和空间稳定性方面讨论了两个苯基之间的二面角。预计在高温下会发生围绕两个苯基成分之间的C–C键的轻松旋转。在这里，我们报告对旋转动力学的观察。转子的结构和旋转动力学表现出显着的温度依赖性。随着晶体内部联苯的角位移随温度升高而增大，单晶体的双折射降低。