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

A pair of novel Tb^III-based enantiomers, [Tb（dbm）·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 diffi＇action, 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 Tb^III ion was eight-coordinated by six O atoms of three dbm ligands and two N atoms fi-om 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 ℃.