Synthesis, Structures, Luminescent and Magnetic Properties of Heterometallic 5p-4f Compounds with Ethylenediaminetetraacetate

A series of heterometallic LnIIISbIII edta-containing compounds with the formulas [Sb2(edta)2Ln]NO3 center dot nH2O [edta = ethylenediaminetetraacetate; Ln = Eu, n = 7 (1); Gd, n = 7.5 (2) and Tb, n = 8 (3)] were synthesized and characterized by elemental analyses (EA), powder X-ray diffraction (PXDP), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analyses (TGA). Their fluorescence and magnetic properties were also studied. The thermal analysis demonstrates the compounds formation of the antimony, lanthanide ions, and edta4 ligands. FT-IR spectra reveal that the antimony and lanthanide ions are connected through the carboxylate bridges. The studies of luminescence properties show that compounds 1 and 3 exhibit typical luminescence in the visible region. Furthermore, magnetic properties reveal compounds 2 and 3 have weak ferromagnetic behavior.