Correlation Between Orientation of the Stacked π‐Electron Systems and Chiroptical Properties

Abstract The correlation between the orientation of the two π‐electron systems and the chiroptical properties was investigated using two types of optically active X‐shaped molecules consisting of planar chiral [2.2]paracyclophanes. The X‐shaped molecules exhibited high photoluminescence quantum efficiencies and good circularly polarized luminescence properties with relatively high anisotropy factors of the order of 10 −3 . It was experimentally and theoretically elucidated that the chiroptical properties of the two molecules were almost identical, regardless of the orientation of the stacked π‐electron systems.