Lead(II) chloride

Abstract: The absorption and emission spectra of GeC13-, SnC13-, PbC13-, and PbC142- in acetonitrile were recorded. In addition, emission quantum yields and lifetimes were determined. The emitting excited states are of the metalcentered sp type and originate from the 3P state of the free s2 ions. It is suggested that the complex ions which have trigonal-pyramidal C3” (MC13-) and seesaw C2, (PbC1d2-) structures in the ground state rearrange toward trigonalplanar D3h and tetrahedral Td geometries, respectively, in their sp excited states.

Abstract: Irreversible crystal-to-crystal transformations of 3D lead(II) coordination polymers with the ligand 1H-1,2,4-triazole-3-carboxylic acid (HL), from [Pb(L)(μ2-Cl)(H2O)]n (1) to [Pb(L)(μ2-Br)(H2O)]n (2) and [Pb(L)(μ1,1-NCS)(H2O)]n (3) by solid-state anion-replacement processes under mechanochemical reactions, have been studied. The thermal stabilities of compounds 1–3 were studied by thermogravimetric and differential thermal analyses. These irreversible solid-state structural transformations of compound 1 to compounds 2 and 3, have been verified by PXRD measurements. PbCl2, PbBr2 and PbS nanoparticles were obtained by thermal decomposition of compounds 1, 2 and 3 in oleic acid as surfactant at 200 °C under air atmosphere, respectively. These nanoparticles were characterized by powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM).