Circularly Polarized Luminescent Bis(Boron Difluoride) Complexes with Chiral Schiff‐base Ligands

Abstract The syntheses, structures, and circularly polarized luminescence (CPL) properties of bis(boron difluoride) complexes with chiral Schiff‐base ligands are described herein. A series of chiral Schiff‐base bis(boron difluoride) complexes based on the naphthalene backbone were prepared by reacting BF 3 ⋅OEt 2 with the corresponding precursors, and the molecular structures were identified by NMR spectroscopy and X‐ray diffraction (XRD) analysis. These complexes exhibited efficient photoluminescence in dilute solution with high emission quantum yields ( Φ ) up to 0.99. The circularly polarized luminescence properties of the molecules were also investigated. Compared to solution, in the KBr dispersed pellet state the absolute value of the luminescence dissymmetry factor ( g lum ) was significantly increased up to 1.2×10 −2 . The photophysical properties were further investigated by means of DFT calculations.