Synthesis, crystal structures and characterization of a pair of TbIII-based enantiomers

A pair of novel TbIII-based enantiomers, [Tb(dbm)3·LSS] (1) and [Tb(dbm)3·LRR] (2) (where LSS=(+)-4,5-pinene bipyridine, LRR= (-)-4,5-pinene bipyridine, dbm=dibenzoylmethanate), were synthesized and characterized based on single crystal X-ray diffraction, elemental analysis, FT-IR, TG and CD spectra. X-ray diffraction analysis showed that both the complexes crystallized in monoclinic crystal system with P21 chiral space group. The TbIII ion was eight-coordinated by six O atoms of three dbm ligands and two N atoms from one chiral ligand LSS or LRR. The CD spectra revealed that complexes 1 and 2 were enantiomers. Thermogravimetric analysis results indicated that 1 and 2 were thermally stable up to 246 °C.