A 2-Dimensional Pb(II) metal-organic framework, [Pb(bdc)0.5(py-Phen)NO3]n (SM-3) was synthesized under solvothermal conditions utilizing a mixed ligand approach. SM-3 assembled through dinuclear SBUs [Pb2(COO)2]2-, oxygen donor H2bdc = 1,4-benzene dicarboxylic acid,...