Optically Active Triangle‐shaped Macrocycles Based on Planar Chiral [2.2]Paracyclophane

Abstract An optically active macrocycle containing an enantiopure pseudo‐ ortho ‐linked [2.2]paracyclophane skeleton was synthesized. This molecule consisted of a phenylene‐ethynylene‐typed π‐conjugation system, which was folded to construct a triangle‐shaped (one‐handed helical) structure. The extended π‐conjugation length derived from the single π‐conjugation system resulted in a large molar absorption coefficient and a good photoluminescence quantum efficiency. Intense circularly polarized luminescence (CPL) signals were observed, and the chiroptical properties were reproduced by the molecular simulations. The macrocycle was found to be a good CPL emitter with a high anisotropy factor and high CPL brightness values.