Remarkable Effects of External Magnetic Field on Circularly Polarized Luminescence of Eu<sup>III</sup>(hfa)<sub>3</sub> with Phosphine Chirality
Kohei Mishima, Daiki Kaji, Michiya Fujiki, Yoshitane Imai
Abstract
Abstract Herein, magnetic circularly polarized luminescence (CPL) (MCPL) spectroscopy was conducted to analyze an Eu III (hfa) 3 complex with three chiral P III ‐ligands. Resultantly, ( R )‐chirality luminophores with S‐up orientation and ( S )‐chirality luminophores with N‐up orientation were observed to possess symmetrical mirror image spectra, i. e., they were enantiomers. Similarly, the ( R )‐chirality luminophores with N‐up orientation and the ( S )‐chirality luminophores with S‐up orientation were also enantiomers. Contrarily, ( R )‐S‐up and ( S )‐S‐up were diastereomers and did not possess a mirror‐image relationship. Likewise, ( R )‐N‐up and ( S )‐N‐up were diastereomers. The J ‐dependency of g MCPL and g CPL datasets suggested that the N‐up/S‐up external magnetic field, with the aid of chiral P III ‐ligands, increased the g MCPL values by two‐ to sixteen‐fold and modulated the g MCPL signs at J =1–4. Additionally, the origins of the nonideal mirror‐symmetric CPL and MCPL spectral characteristics of Eu III (hfa) 3 with three chiral P III ‐ligands were discussed in terms of parity (space‐inversion, P )‐symmetry, time‐reversal ( T )‐symmetry, and PT ‐symmetry laws.