Stacking Transformation‐Triggered Circularly Polarized Luminescence Reversion in γ‐Cyclodextrins‐Pyrene Co‐assembly

​Considerable attention has been directed towards cyclodextrins (CDs) in the creation of co‐assembled CPL‐active materials, owing to their intrinsic chiral host cavities and synergistic host‐guest interactions. However, achieving reversed CPL emission regulation with single‐handedness CDs moiety poses a significant challenge. In this study, we have devised a series of γ‐CD‐based host‐guest complexes comprising dual pyrene imidazolium derivatives with multiple linkers, which exhibit reversed circularly polarized emission. We have uncovered that the transformation of excimer stacking within γ‐CD/pyrene complexes contributes to the inverted CPL emissions originating from a single‐handed chiral host. This research elucidates the phenomenom of (+)‐ and (‐)‐circularly polarized excimer emission (CPEE) within γ‐CD, arising from right‐ and left‐handed stacking conformations, respectively.