Sonochemical synthesis and characterization of nano-sized lead(II) 3D coordination polymer: Precursor for the synthesis of lead(II) oxybromide nanoparticles

Nanoparticles of a three-dimensional coordination polymer, [Pb(L)(μ2-Br)(H2O)]n (1), (L− = 1H-1,2,4-triazole-3-carboxylate), have been synthesized by an ultrasonic method and characterized by scanning electron microscopy, X-ray powder diffraction, IR spectroscopy and elemental analyses. The thermal stability of compound 1 both its bulk and nano-size has been studied by thermal gravimetric (TG) and differential thermal (DTA) analyses and compared each other. Concentration of initial reagents effects and the role of power ultrasound irradiation on size and morphology of nano-structured compound 1, have been studied. Calcination of the compound 1 at 500 °C under air atmosphere yields Pb3O2Br2 nanoparticles.

► Nanoparticles of a 3D Pb(II) coordination polymer was sonochemicaly synthesized.
► Particle sizes of the nanoparticles depend on the power of ultrasound irradiation.
► High power of ultrasound irradiation decreased particles size of compound 1.
► Pb3O2Br2 nanoparticles were synthesized by calcination of compound 1 at 500 °C.