Paper Title
Irreversible Transformations Of 3d Lead(II) Coordination Polymers Via Mechanochemistry; Precursors For The Preparation Of Lead(II) Chloride/Bromide/Sulfide Nanoparticles

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)(2-Cl)(H2O)]n (1) to [Pb(L)(2-Br)(H2O)]n (2) and [Pb(L)(1,1-NCS)(H2O)]n (3) by solid-state anion-replacement processes under mechanochemical reactions, have been studied. 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. Keywords- coordination polymers,mechanochemical, nanoparticles