Synthesis, crystal structures and characterization of DyIII-containing enantiomeric pair

As a result of the reaction between Dy(dbm)3·2H2O and chiral ligands LS,S(+)-4,5-pinene bipyridine or LR,R(−)-4,5-pinene bipyridine, a novel DyIII-based enantiomeric pair, Dy(dbm)3LS,S and Dy(dbm)3LR,R, has been obtained and characterized by X-ray single crystal determination and spectroscopic methods. The crystal structure analysis of 1 and 2 reveals that they crystallize in chiral space group P21 of monoclinic system. The central DyIII ion is eight-coordinated with six oxygen atoms of three β-diketonate anions and two nitrogen atoms of chiral pinene bipyridine, forming a coordination polyhedron best described as the distorted square antiprism. The CD spectra reflect that complexes 1 and 2 are enantiomers. Thermogravimetric analysis results indicate that 1 and 2 are thermally stable up to 249 °C.