Hydrothermal synthesis and characterization of a 3D luminescent lead(II) framework containing 3D Pb–X–Pb linkage (X = O and Cl) tuned by cis- and trans-ligand conformations

Under hydrothermal conditions using cis-butenedioic acid (H2L) and corresponding lead(II) salts, a three-dimensional (3D) lead(II) complex {[Pb2(L)(μ2-Cl)(μ3-Cl)]}n (1) containing 3D Pb–X–Pb (X = O and Cl) linkage has been isolated. 1 also represents a truly 3D hybrid luminescent lead(II) framework with I3O0 type connectivity. Further analysis reveals that cis- and trans-conformations of butenedioic acid ligand greatly affect the lead(II) framework structure. Solid-state fluorescence spectrum of 1 exhibits the maximum emission peak at 379 nm.