Synthesis,structure, and luminescence of a novel lead(II) coordination polymer with 1,2-phenylenediacetic acid

A coordination polymer Pb₂(phda)₂]_n (H₂phda = 1,2-phenylenediacetic acid) was synthesized and characterized by single crystal X-ray diffraction. The complex has a (6, 6)-connected 2D framework with topology of (4¹⁵), in which Pb²⁺…π interaction is observed. The 2D framework is further assembled by C–H…π interactions, resulting in a 3D supramolecular network. The fluorescence of the complex is assigned to the intraligand π^?–π transition and the ligand-to-metal charge transfer.