Construction of one 2D samarium-organic framework based on 2,4′-biphenyldicarboxylate

A new 2D samarium compound [Sm(2,4′-bpdc)(2,4′-Hbpdc)H2O]n (1) (2,4′-H2bpdc = 2,4′-biphenyldicarboxylic acid) has been successfully constructed by the hydrothermal reaction of Sm2O3 with 2,4′-H2bpdc, and characterized by elemental analysis, IR spectroscopy and thermogravimetric analysis, as well as single-crystal X-ray diffraction. The results reveal that complex 1 possesses a 2D framework with 44 topology constructed from one-dimensional lanthanide-carboxylate meso-helical chains [Sm(O–C–O)2]n (Δ + Λ) and (2,4′-bpdc2−)2 pillars; this complex represents the first example of a lanthanide compound containing 2,4′-biphenyldicarboxylate as the sole ligand. Moreover, compound 1 displays a certain photoluminescent property and high thermal stability.

Graphical AbstractOne new 2D framework with 44 topology constructed from one-dimensional lanthanide-carboxylate meso-helical chains [Sm(O–C–O)2]n (Δ + Λ) and (2,4′-bpdc2−)2 pillars, which represents the first example of a lanthanide complex possessing the ligand 2,4′-biphenylcarboxylate with different coordination modes.Figure optionsDownload as PowerPoint slideResearch Highlights
► A number of lanthanide metal–organic frameworks (LMOFs) with fascinating architecture have been synthesized via dicarboxylate ligands.
► However, few effort has been devoted to the investigation of transition/lanthanide-metal coordination chemistry involving 2,4′-biphenyldicarboxylic acid up to now.
► To the best of our knowledge, the compound [Sm(2,4′-bpdc)(2,4′-Hbpdc)H2O]n (1) (2,4′-H2bpdc = 2,4′-biphenyldicarboxylic acid) reported in the manuscript is the first example of the lanthanide coordination polymer containing single 2,4′-H2bpdc ligand.