Syntheses, structures, and luminescent and magnetic properties of novel three-dimensional lanthanide complexes with 1,3,5-benzenetriacetate.

摘要: Five novel lanthanide complexes with the formulas [Nd(bta)(H2O)2.4.35H2O]n(1), [Sm(bta)(H2O)2.4.5H2O]n (2), [Eu(bta)(H2O).1.48H2O]n (3), [Tb(bta)(H2O).1.31H2O]n (4), and [Yb(bta)(H2O).H2O]n (5) (H3bta = 1,3,5-benzenetriacetic acid) have been prepared by using corresponding salt H3bta. The results of an X-ray crystallographic analysis revealed that all three-dimensional channel-like structures, in which bta3- ligands adopt different coordination modes: monodentate mu2-eta2:eta1-bridging modes 1, 2, 5 mu2-eta1:eta1-bridging 3 4, respectively. Complexes 1 as well are isostructural, respectively, Ln(III) (Ln Nd, Sm, Eu, Tb) atoms nine-coordinated, while Yb(III) complex eight-coordinated. Both 4 showed strong luminescence upon excitation, their decay curves fit single exponential decays lifetime is 0.45 ms for 1.0 4. magnetic properties were investigated temperature range 1.8-300 K.