Four two-dimensional lanthanide(III)-4,4-biphenyldicarboxylate complexes: Syntheses, structures, magnetic and luminescent properties

Abstract

Four novel Ln-bpdc coordination polymers [Ln(bpdc)(NO3)(DMA)2] [Ln=La(1), Pr(2), Sm(3), Eu(4)] [Ln=lanthanide, H2bpdc=4,4-biphenyldicarboxylate acid and DMA=dimethylacetamide] have been solvothermally synthesized and structurally characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. 1–4 crystallize in the monoclinic space group P21/c and show a 2-D layer constructed from 1-D Ln–organic chain and tetradentate bpdc2− ligand. The magnetic behavior of 2–4 has been investigated. The solid-state photoluminescent measurement illustrates that Eu(4) displays the strong fluorescent emissions, which demonstrate that π-rich aromatic organic bpdc2− ligands can efficiently transfer energy to the EuIII ions. In addition, thermogravimetric analysis of Pr(2) is also described.