Synthesis and characterization of a novel coordination polymer with isolated tetranuclear lead(II) clusters as building subunits

A novel coordination polymer, [Pb4(L1)3(μ4-O)(H2O)]n (1 H2L1 = 5-(pyridine-2-ylmethoxy)-isophthalic acid), was hydrothermally synthesized, which contains μ4-oxygen-bridged Pb4O tetrahedral clusters as building subunits. These isolated Pb4O tetrahedral clusters are combined by the L1 ligands, extending into a two-dimensional (2D) layered motif. Finally, these parallel layers are further linked by intermolecular CH⋯π interactions to form a three-dimensional (3D) stacked supramolecular architecture. Moreover, this polymer exhibits strong photoluminescence at room temperature.