Solid state syntheses of nano lead(II) iodide triazole carboxylate coordination polymer from its bromide/thiocyanate/chloride analogs via mechanochemical crystal to crystal transformations

Irreversible crystal-to-crystal transformations of 3D lead(II) coordination polymers with the ligand 1H-1,2,4-triazole-3-carboxylic acid (HL), [Pb(L)(μ2-Br)(H2O)]n (1), [Pb(L)(μ1,1-NCS)(H2O)]n (2) and [Pb(L)(μ2-Cl)(H2O)]n (3) to [Pb(L)(μ2-I)]n (4) by solid state anion-replacement processes, have been studied. Nanoparticles of compounds 1 and 2 were synthesized by sonochemical process. The SEM images showed that no morphology change occurs during anion-replacements of nanocrystals.