Optically Active A‐Shaped Cyclic Molecules Based on Planar Chiral [2.2]Paracyclophanes Emitting Bright Circularly Polarized Luminescence with High Anisotropy Factors

Abstract

AbstractOptically active A‐shaped cyclic molecules are synthesized by incorporating a planar chiral [2.2]paracyclophane unit to form a helical structure. These molecules exhibit large molar absorption coefficients, moderate photoluminescence (PL) quantum efficiencies, and high circularly polarized luminescence (CPL) anisotropy factors, resulting in high CPL brightness values (BCPL values). According to the time‐dependent density functional theory (TD‐DFT) theoretical studies, extended π‐conjugated moieties act as light‐harvesting units, and emissions occur from the helical skeletons. The TD‐DFT calculations reproduce the experimentally determined absorption, PL, circular dichroism, and CPL properties of the A‐shaped cyclic molecules.