From 1D chain to infinite 3D coordination polymer: sonochemical syntheses and structural characterization of a new nano lead (II) coordination compound containing three interesting coordination modes of azide anions

Nano structure of a new 1D Pb(II) coordination polymer, [Pb₃(p-2ma)₃(N₃)₃(NO₃)₃]_n (1), (p-2ma = pyridin-2-ylmethanamine), have been synthesized by a sonochemical process and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), ¹H NMR, C NMR, FT-IR spectroscopy and elemental analyses. Structural determination of compound 1 reveals three Pb(II) centers with different coordination numbers. The coordination sphere of the Pb(II) centers take asymmetrical hemidirected geometry. There are three interesting coordination modes of azide anions (μ₂-1,1, μ₃-1,1,3 and terminal azide anions) observed in the structure. Through weak supramolecular interactions, the overall structure of 1 extended into a three dimensional (3D) supramolecular structure. PbO nanoparticles are obtained by thermolysis of 1 at 180 °C with oleic acid as a surfactant.