Novel lead-organic framework based on 2,2′-bipyridine-3,3′-dicarboxylate ligand: Synthesis, structure and luminescence

A new metal–organic framework, [Pb4(bpdc)4(H2O)2]·3H2O (1) (H2bpdc = 2,2′-bipyridine-3,3′-dicarboxylate), has been synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction, powder X-ray diffraction, IR spectroscopy, TGA and elemental analyses. Compound 1 shows 4-connected 2-D lattice structures which are assembled by novel [Pb4(bpdc)4(H2O)2] tetranuclear units and bpdc ligands with different coordination modes that have never been reported. In addition, compound 1 exhibits blue fluorescent emissions at λmax = 421 nm in the solid state at room temperature.