Multistate Circularly Polarized Luminescence Switching through Stimuli‐Induced Co‐Conformation Regulations of Pyrene‐Functionalized Topologically Chiral 2Catenane

Aiming at the construction of novel circularly polarized luminescence (CPL) switches with multiple switchable emission states and high dissymmetry factors (glum ), topologically chiral 2catenanes were employed as the key platform to construct a novel multistate CPL switching system. Taking advantage of the precise co-conformation regulations of the resultant pyrene-functionalized 2catenanes under different external stimuli, reversible transformations between three emission states with different CPL performances, i.e. the initial "closed" form with a |glum | value of 0.012, the "open" form with an almost complete turn-off of CPL emission, and the "protonated" form with a boosted |glum | value of 0.022, were successfully realized. This study demonstrates the successful construction of not only the first topological chirality-based CPL switch, but also a novel bidirectional CPL switch, thus providing a promising platform for the construction of novel chiral materials.