以 2 ,2′,6 ,6′-四取代联苯为例 ,从理论上阐明了联芳烃类分子的螺旋结构与旋光方向的关系 ,然后详细地分析了几个有代表性的联芳烃类分子的螺旋结构与旋光方向。结果表明这类分子的构象决定着其旋光方向 ;反过来 ,分子的旋光方向亦指明了它们的构象。 Taking the 2, 2 ’, 6, 6’-tetrasubstituted biphenyl as an example, the relationship between the helical structure and the optical rotation direction of biaryl aromatic molecules is elucidated theoretically. Then several representative biaryl aromatic hydrocarbons Molecular Helical Structure and Polarization Direction. The results show that the conformation of these molecules determines their optical rotation direction; in turn, the optical rotation direction of the molecules also indicates their conformation.