The interest in enantiopure metallic compounds and chirality of octahedral complexes has been increased, especially in the areas of bioinorganic and supramolecular chemistry and catalysis. Among them cyclometalated iridium(III) complexes show high lum...
The interest in enantiopure metallic compounds and chirality of octahedral complexes has been increased, especially in the areas of bioinorganic and supramolecular chemistry and catalysis. Among them cyclometalated iridium(III) complexes show high luminescence efficiency at room temperature. Racemic iridium luminophores emit non-polarized light with a polarization bias. In contrast, enantio-enriched iridium complexes emit circularly polarized light. Therefore, it is important to separate racemic luminescent mixture into two enantiomers and obtain optical purity-enhanced complexes.
In this study, we prepared various iridium(III) complexes starting from 2-phenylpyridine and iridium chloride hydrate and resolved them on polysaccharide CSPs. Iridium complexes that we made have either a facial or meridional configuration. And each of them is separated into two enatiomers efficiently. Enantio-enriched cyclometalated iridium(III) complexes were synthesized by using optically active solvent, (R)-(-)-1-methoxy-2-propanol and (S)-(+)-1-methoxy-2-propanol. When enantio-enriched iridium complexes prepared were recrystallized, racemic complexes were obtained as crystal and optically pure or optical purity-enhanced complexes were obtained in mother liquor.