3-D Lanthanide Metal-Organic Frameworks: Structure, Photoluminescence, and Magnetism

A series of isostructural three-dimensional metal-organic frameworks [Pr<sub>2</sub>(N-BDC)<sub>3</sub>(dmf)<sub>4</sub>]<sub>∞</sub> (<b>1</b>), {[Eu<sub>2</sub>(N-BDC)<sub>3</sub>(dmf)<sub>4</sub>]·2DMF}<sub>∞</sub> (<b>2</b>·2DMF), [Gd<sub>2</sub>(N-BDC)<sub>3</sub>(dmf)<sub>4</sub>]<sub>∞</sub> (<b>3</b>), {[Tb<sub>2</sub>(N-BDC)<sub>3</sub>(dmf)<sub>4</sub>]·2DMF}<sub>∞</sub> (<b>4</b>·2DMF), {[Dy<sub>2</sub>(N-BDC)<sub>3</sub>(dmf)<sub>4</sub>]·2DMF}<sub>∞</sub> (<b>5</b>·2DMF) (N-H<sub>2</sub>BDC = 2-amino-1,4-benzenedicarboxylic acid; DMF = N,N′-dimethylformamide) with cubic 4<sup>12</sup>·6<sup>3</sup> topology have been synthesized using solvothermal conditions. The networks were generated via formation of a dinuclear Ln<sub>2</sub> secondary building block, involving the dicarboxylate ligand as a bridge. The luminescent properties of the Tb<sup>III</sup> and Eu<sup>III</sup> complexes were studied and showed characteristic emissions at room temperature. Antiferromagnetic interactions between Ln<sup>III</sup> ions were observed from magnetic susceptibility data.