Circularly Polarized Luminescence from Helically Chiral <i>N</i>,<i>N</i>,<i>O</i>,<i>O</i>‐Boron‐Chelated Dipyrromethenes

Abstract

Abstract Helically chiral N , N , O , O ‐boron chelated dipyrromethenes showed solution‐phase circularly polarized luminescence (CPL) in the red region of the visible spectrum ( λ em (max) from 621 to 663 nm). The parent dipyrromethene is desymmetrised through O chelation of boron by the 3,5‐ ortho ‐phenolic substituents, inducing a helical chirality in the fluorophore. The combination of high luminescence dissymmetry factors (| g lum | up to 4.7 ×10 −3 ) and fluorescence quantum yields ( Φ F up to 0.73) gave exceptionally efficient circularly polarized red emission from these simple small organic fluorophores, enabling future application in CPL‐based bioimaging.