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

Four novel Ln-bpdc (H2bpdc = 4,4-biphenyldicarboxylate acid) complexes have been solvothermally synthesized. Complexes 1-4 are isomorphous, which display a 2-D framework constructed by 1-D [Ln(COO)2] chains and μ4-η1:η1:η1:η1 bpdc2− ligand. Variable-temperature magnetic studies reveal that Pr(2), Sm(3) and Eu(4) show antiferromagnetic interactions between lanthanide cations. The solid-state photoluminescent measurement illustrates that Eu(4) displays the strong fluorescent emissions and the long lifetime, which demonstrate that π-rich aromatic organic bpdc2 − ligands can efficiently transfer energy to the EuIII ions.