From discrete to infinite 3D coordination polymer: Sonochemical syntheses and structural characterization of a new nano flower lead (II) coordination compound

Nano flower of a new discrete Pb (II) coordination compound, [Pb(pcih)₂] (1), (pcih = 2-pyridinecarbaldehyde isonicotinoylhy-drazonate), have been synthesized by a sonochemical process and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), FT-IR spectroscopy and elemental analyses. Structural determination of compound 1 reveals the Pb (II) ion is six coordinated, bonded to four nitrogen and two oxygen atoms from two “pcih” ligands. Through strong π-π interactions, the overall structure of 1 is 1D supramolecular chain and with other directional intermolecular interactions, it is further extended into a three dimensional (3D) supramolecular structure. Density functional theory calculations (B3LYP functional) have been performed on complex 1 to provide a qualitative theoretical interpretation of their structural parameters, charge distributions and IR spectra. PbO nanoparticles are obtained by thermolysis of 1 at 180 °C with oleic acid as a surfactant.