Lanthanide metal organic frameworks based on octahedral secondary building units: Structural, luminescent, and magnetic properties

Three new lanthanide metal organic frameworks (LnMOFs), [HNMe2][Ln2(m-BDC)3(phen)2] (Ln = Eu 1, Gd 2, Tb 3, m-H2BDC = 1,3-benzenedicarboxylic acid, phen = 1,10-phenanthroline), have been solvothermally synthesized through self-assembly reactions. Complexes 1–3 are isostructural and possess 3D architectures based on the octahedral [Ln2(COO)6] SBUs with a pcu net topology. Photoluminescence measurements show that 1 and 3 are highly emissive at room temperature with quantum yields of 86.87% (at 330 nm) and 85.62% (at 345 nm), respectively, and may be good candidates for light-emitting diodes (LEDs) and light applications. The magnetic properties of 2 and 3 have also been investigated through the measurement of their magnetic susceptibilities over the temperature range of 2–300 K.

Graphical abstractThree new 3D LnMOFs have been synthesized employing mixed ligands of 1,3-benzenedicarboxylic acid and 1,10-phenanthroline. The frameworks are based on octahedral secondary building units with pcu topological net. Luminescent and magnetic properties have been examined in the solid stateFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► High performance in quantum yields (>85%) and fluorescence lifetime for 1 and 3. ► Pcu net topology frameworks based on octahedral secondary building units. ► Magnetic interaction between Gd(III) ions can be estimated by a simple dimeric mode. ► Mixed ligand complex.