Nanosized Carbon Macrocycles Based on a Planar Chiral Pseudo Meta‐[2.2]Paracyclophane

Structural designs combining cycloparaphenylenes (CPPs) backbone with planar chiral [2.2]paracyclophane ([2.2]PCP) lead to optical‐active chiral macrocycles with intriguing properties. X‐ray crystal analysis revealed aesthetic necklace‐shaped structures and size‐dependent packages with long‐range channels. The macrocycles exhibit unique photophysical properties with high fluorescence quantum yield of up to 82 %, and the fluorescent color varies with ring size. In addition, size‐dependent chiroptical properties with moderately large CPL dissymmetry factor of 10−3 and CPL brightness in the range of 30–40 M−1 cm−1 were observed. The combination of planar chiral pseudo meta‐ [2.2]paracyclophane with cycloparaphenylenes backbone leads to necklace‐shaped chiral macrocycles, which exhibit unique photophysical properties with high fluorescence quantum yield of up to 82 %. In addition, size‐dependent chiroptical properties with moderately large |glum| and CPL brightness BCPL value originating from the planar chirality of [2.2]paracyclophane were observed.