Synthesis, crystal structures and triboluminescence of a pair of Eu(III)-based enantiomers

Using the chiral ligands LSS (+)-4,5-pinene bipyridine and LRR (−)-4,5-pinene bipyridine (Scheme 1), two novel Eu(III)-based complexes with the formula [Eu(DBM)3L] (LSS in 1, LRR in 2, DBM = dibenzoylmethanate) have been successfully synthesized and characterized by X-ray single crystal determination and spectroscopic methods. The crystal structure analysis of 1 and 2 reveal that they crystallize in the chiral space group P21 of the monoclinic system. The central Eu(III) ion is eight-coordinated in a geometrical environment intermediate between a square antiprism and a dodecahedron. The CD spectra reflect that complexes 1 and 2 are enantiomers. When ground in daylight, complexes 1 and 2 exhibit brilliant triboluminescence at room temperature.

Using the chiral ligands LSS (+)-4,5-pinene bipyridine and LRR (−)-4,5-pinene bipyridine, two novel lanthanide enantiomers [Eu(DBM)3L] (LSS in 1, LRR in 2, DBM = dibenzoylmethanate) have been successfully synthesized and characterized by X-ray single crystal determination and spectroscopic methods. They crystallize in the chiral space group P21 of the monoclinic system. Both of them exhibit brilliant triboluminescence in daylight.Figure optionsDownload as PowerPoint slide